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< Page ,Total 49 >
Research on Preliminary Design and Analysis Method of Mixed-flow/Centrifugal Compressor EI
期刊论文 | 2021 , 42 (2) , 393-398 | Journal of Engineering Thermophysics
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Abstract :

The preliminary design and analysis methods of single-stage mixed-flow/centrifugal compressors were studied on the basis of the two-zone model, and the accuracy of the improved ODP problem iterative method based on SOA-TEIS mixed diffusion model in the preliminary design and analysis of the mixed-flow/centrifugal compressor was verified. The one-dimensional design and analysis of Krain high specific speed impeller and low specific speed impeller models were carried out using this method, and the results were compared with experimental data. The results show that the method presented in this paper could reduce the dependence on engineering experience parameter selection, and achieve accurate preliminary design calculations and off-design point performance predictions for mixed-flow/centrifugal compressors. The method was easy to implement programmatically, and the isentropic efficiency prediction deviation of the operating conditions near the design point obtained by the passive slip factor calculation method was within 1%. © 2021, Science Press. All right reserved.

Keyword :

Compressors Design Impellers Iterative methods

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GB/T 7714 Tang, Yong-Hong , Wang, Zhi-Heng , Ji, Cheng et al. Research on Preliminary Design and Analysis Method of Mixed-flow/Centrifugal Compressor [J]. | Journal of Engineering Thermophysics , 2021 , 42 (2) : 393-398 .
MLA Tang, Yong-Hong et al. "Research on Preliminary Design and Analysis Method of Mixed-flow/Centrifugal Compressor" . | Journal of Engineering Thermophysics 42 . 2 (2021) : 393-398 .
APA Tang, Yong-Hong , Wang, Zhi-Heng , Ji, Cheng , Xi, Guang . Research on Preliminary Design and Analysis Method of Mixed-flow/Centrifugal Compressor . | Journal of Engineering Thermophysics , 2021 , 42 (2) , 393-398 .
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Simulations of the Viscous Shock Tube With Finite Volume WENO Schemes EI
期刊论文 | 2021 , 42 (1) , 115-120 | Journal of Engineering Thermophysics
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In this paper, a finite volume WENO scheme on OpenFOAM, which can achieve arbitrary high order and be applied to unstructured grids, is used to simulate the viscous shock tube. The simulation is conducted on structured grids and triangular unstructured grids, in which the third-order and fourth-order WENO schemes are used to discretize the convection term. The results show that the accuracy and efficiency of the scheme on triangular unstructured grids are better than that on structured grids, and the efficiency of the third-order WENO scheme is higher than that of the fourth-order scheme. This work shows that the third-order WENO scheme with unstructured grids on OpenFOAM has more advantages and application potential in the simulation of complex flow fields such as internal flow of turbomachinery. © 2021, Science Press. All right reserved.

Keyword :

Shock tubes Efficiency

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GB/T 7714 Chai, De-Lin , Xi, Guang , Sun, Zhong-Guo . Simulations of the Viscous Shock Tube With Finite Volume WENO Schemes [J]. | Journal of Engineering Thermophysics , 2021 , 42 (1) : 115-120 .
MLA Chai, De-Lin et al. "Simulations of the Viscous Shock Tube With Finite Volume WENO Schemes" . | Journal of Engineering Thermophysics 42 . 1 (2021) : 115-120 .
APA Chai, De-Lin , Xi, Guang , Sun, Zhong-Guo . Simulations of the Viscous Shock Tube With Finite Volume WENO Schemes . | Journal of Engineering Thermophysics , 2021 , 42 (1) , 115-120 .
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A generic smoothed wall boundary in multi-resolution particle method for fluid–structure interaction problem EI
期刊论文 | 2021 , 378 | Computer Methods in Applied Mechanics and Engineering
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Dealing with complex geometry boundaries is a challenge for particle boundary conditions. Since the effective area of the fluid particle is cut off by the boundary, it is difficult to obtain accurate results near the boundary, especially for complex geometry shapes. Things become more complicated when dealing with multiple sizes of particles in multi-resolution particle methods. In this paper, a generic smoothed wall (GSW) boundary is proposed by using single layer particles to accurately discretize the boundary. The boundary weight function is transformed to a distance function to fill the vacancy of the particle number density of fluid particles. The GSW boundary can be applied in the static, moving and non-linear deforming wall conditions. It also can be used to effectively handle complex geometric boundaries, since simulation results are not affected by changes in the number and size of wall particles. In addition, the GSW boundary also shows good results when combined with multi-resolution methods solving problems with multiple sizes of particles. In this paper, the MPS–DEM coupling method with GSW boundary model is applied to solve non-linear FSI problem. Several cases have been calculated to validate the accuracy, convergency and stability of the GSW boundary model. Compared with dummy particle boundary, results show that the proposed GSW boundary model can improve the numerical accuracy near the boundary, and handle arbitrary moving boundaries with high efficiency. © 2021 Elsevier B.V.

Keyword :

Geometry Computer applications Computational methods

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GB/T 7714 Sun, Yijie , Xi, Guang , Sun, Zhongguo . A generic smoothed wall boundary in multi-resolution particle method for fluid–structure interaction problem [J]. | Computer Methods in Applied Mechanics and Engineering , 2021 , 378 .
MLA Sun, Yijie et al. "A generic smoothed wall boundary in multi-resolution particle method for fluid–structure interaction problem" . | Computer Methods in Applied Mechanics and Engineering 378 (2021) .
APA Sun, Yijie , Xi, Guang , Sun, Zhongguo . A generic smoothed wall boundary in multi-resolution particle method for fluid–structure interaction problem . | Computer Methods in Applied Mechanics and Engineering , 2021 , 378 .
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Bypass transition in flow over a vibrating flat plate EI SCIE
期刊论文 | 2021 , 909 | JOURNAL OF FLUID MECHANICS
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The development of free-stream disturbances in flow over a vertically vibrating flat plate with a slender leading edge is investigated. The evolution of the optimal inflow perturbation that results in the maximum amplification is computed to investigate the effect of the plate vibration on the development of free-stream disturbance, secondary instability of streaks and subsequently the bypass transition to turbulence. It is observed that the plate vibration leads to periodic change of the angle of attack, shifting the free-stream disturbance to the upper or lower side of the plate. Therefore, the development of steady inflow perturbations, which receive the largest amplification, is interrupted by the vibration, and the perturbation amplification via the lift-up mechanism is weakened. The vibration brings a second peak of perturbation growth at the vibration frequency, leading to high-frequency free-stream perturbations penetrating into the base boundary layer, which is not observed in flow over a stationary plate owing to the sheltering mechanism. This resonance of the flow perturbation and the vibrating plate is explained by the staggering effect of the leading edge. Further, the direct numerical simulations with the optimal inflow perturbation imposed on the inflow boundary show that the vertical vibration of the plate leads to streamwise periodic vorticity near the edge of the boundary layer. This inhomogeneity of the streamwise vorticity brings about streamwisely localized distortion of the low-speed streaks and, thus, an intermittent secondary instability. Therefore, before the streaks break down to turbulence, they undergo several rounds of secondary instabilities, resulting in an elongated bypass transition process.

Keyword :

transition to turbulence flow-structure interactions boundary-layer stability

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GB/T 7714 Huang, Wenlin , Xiao, Dandan , Ren, Jie et al. Bypass transition in flow over a vibrating flat plate [J]. | JOURNAL OF FLUID MECHANICS , 2021 , 909 .
MLA Huang, Wenlin et al. "Bypass transition in flow over a vibrating flat plate" . | JOURNAL OF FLUID MECHANICS 909 (2021) .
APA Huang, Wenlin , Xiao, Dandan , Ren, Jie , Wang, Zhiheng , Xi, Guang , Mao, Xuerui . Bypass transition in flow over a vibrating flat plate . | JOURNAL OF FLUID MECHANICS , 2021 , 909 .
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Reconstruction of natural convection within an enclosure using deep neural network EI SCIE
期刊论文 | 2021 , 164 | International Journal of Heat and Mass Transfer
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Abstract :

The deep neural network (DNN) is an extensively used technique to fit the high dimensional data. Fluid flow and heat transfer in macroscale are one of the complex physical phenomena which are governed by the Navier-Stokes (N-S) equation. The conventional numerical method (e.g., finite difference method) can solve the equation with corresponding boundary conditions using kinds of spatial discretized methods. In the present paper, the deep neural network can also be used to train and compute the results even if the training data only comes from boundary conditions of velocities and temperature. For the natural convection with few computational fluid dynamics (CFD) based velocities and temperature, the loss function of deep neural network, which mixes the explicit constraint of N-S equation, can reconstruct the fluid and heat field accurately. Usually, the complex geometry or high Rayleigh (Ra) number are corresponding to the complicate distribution of velocities and temperature field, which need more training points to achieve impressive accuracy. The present paper comprehensively investigates reconstructing results with different training data when Ra=103, and finds that only 1.48% points of CFD based data can obtain the impressive conclusion. Besides, the attempt of predicting velocities and temperature of the whole domain from partial region training data has been conducted. Global relative errors of velocities and temperature of Ra=105converge to the value, which is a little larger thanRa=104, although the latter case possesses more training points. When increasing the Rayleigh number to 106, the reconstruction of unsteady natural convection still remains high accuracy even if only 10 snapshots are considered. For the reconstruction of natural convection with complex geometry, the results show that more training points should be fed into the deep neural network to train and learn accurate results. © 2020 Elsevier Ltd

Keyword :

Natural convection Flow of fluids Neural networks Clustering algorithms Deep neural networks Computational fluid dynamics Finite difference method Complex networks Numerical methods Velocity Navier Stokes equations Boundary conditions Geometry

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GB/T 7714 Wang, Tongsheng , Huang, Zhu , Sun, Zhongguo et al. Reconstruction of natural convection within an enclosure using deep neural network [J]. | International Journal of Heat and Mass Transfer , 2021 , 164 .
MLA Wang, Tongsheng et al. "Reconstruction of natural convection within an enclosure using deep neural network" . | International Journal of Heat and Mass Transfer 164 (2021) .
APA Wang, Tongsheng , Huang, Zhu , Sun, Zhongguo , Xi, Guang . Reconstruction of natural convection within an enclosure using deep neural network . | International Journal of Heat and Mass Transfer , 2021 , 164 .
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Multiphysics Coupling Simulation and Parameter Study of Planar Solid Oxide Fuel Cell. PubMed SCIE
期刊论文 | 2021 , 8 , 609338 | Frontiers in chemistry
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Abstract :

In this paper, a numerical model of gas flow, heat transfer, mass transfer and electrochemical reaction multi-physics field coupling of a planar SOFC is established and solved. According to the calculation results, the distribution of velocity, temperature and concentration inside the SOFC cell is analyzed. The influence of cathode inlet flow rate, porosity, rib width and other parameters on the performance of SOFC is also discussed. The results show that within a certain range, increasing the cathode inlet flow rate can significantly increase the average current density of the cell. Increasing the porosity of the electrode can improve the gas diffusion of the porous electrode, thereby increasing the rate of the electrochemical reaction. Increasing the width of the ribs will result in a significant decrease in cell performance. Therefore, the rib width should be reduced as much as possible within the allowable range to optimize the working performance of the cell.

Keyword :

physical fields distribution multiphysics coupling parameter study work performance solid oxide fuel cells

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GB/T 7714 Dang Zheng , Shen Xin , Ma Jinyan et al. Multiphysics Coupling Simulation and Parameter Study of Planar Solid Oxide Fuel Cell. [J]. | Frontiers in chemistry , 2021 , 8 : 609338 .
MLA Dang Zheng et al. "Multiphysics Coupling Simulation and Parameter Study of Planar Solid Oxide Fuel Cell." . | Frontiers in chemistry 8 (2021) : 609338 .
APA Dang Zheng , Shen Xin , Ma Jinyan , Jiang Zhaoyi , Xi Guang . Multiphysics Coupling Simulation and Parameter Study of Planar Solid Oxide Fuel Cell. . | Frontiers in chemistry , 2021 , 8 , 609338 .
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Quantitative Study on Equivalent Roughness Conversion Coefficient and Roughness Effect of Centrifugal Compressor SCIE
期刊论文 | 2020 , 142 (2) | JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
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Abstract :

Applying an appropriate roughness model is one of the most effective ways to improve the accuracy of the numerical simulation for centrifugal compressors, and it is also the key to the study of surface deterioration such as compressor fouling and corrosion. The basis for using the roughness model is to determine the conversion relation between physical roughness and equivalent roughness. In this paper, numerical and experimental studies on the roughness conversion relation for the centrifugal compressors were performed by means of a unique self-developed "pseudo front stage (PFS)" device. An equivalent roughness conversion coefficient of 8.5 was determined on the basis of fitting performance of the U-bend and return channel model. The validity of the conversion coefficient in improving the performance prediction accuracy of the centrifugal compressors was verified by three centrifugal compressor models. The concept of weighted average roughness was proposed to quantify the roughness sensitivity and roughness level of the centrifugal compressor. Quantitative research on the roughness effect of centrifugal compressors indicated that the peak efficiency degradation due to the roughness effect in the compressors was linearly associated with the logarithm of the relative roughness when the impeller of the centrifugal compressor was in the hydraulically rough regime. Doubling or halving the roughness value of all components of a centrifugal compressor in the hydraulically rough flow regime will result in a change in the peak efficiency of the compressor by about 1.72%.

Keyword :

sand-grain roughness equivalent roughness conversion roughness effect centrifugal compressor performance prediction

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GB/T 7714 Tang, Yonghong , Xi, Guang , Wang, Zhiheng et al. Quantitative Study on Equivalent Roughness Conversion Coefficient and Roughness Effect of Centrifugal Compressor [J]. | JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME , 2020 , 142 (2) .
MLA Tang, Yonghong et al. "Quantitative Study on Equivalent Roughness Conversion Coefficient and Roughness Effect of Centrifugal Compressor" . | JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME 142 . 2 (2020) .
APA Tang, Yonghong , Xi, Guang , Wang, Zhiheng , Tian, Yubao . Quantitative Study on Equivalent Roughness Conversion Coefficient and Roughness Effect of Centrifugal Compressor . | JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME , 2020 , 142 (2) .
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Experimental investigation of transient characteristics of mild surge and diffuser rotating stall in a centrifugal compressor with vaned diffuser EI SCIE CSCD
期刊论文 | 2020 , 63 (7) , 1212-1223 | SCIENCE CHINA-TECHNOLOGICAL SCIENCES
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Abstract :

The centrifugal compressor is widely used for gas compression in various industrial fields such as aero-engine, gas turbine and turbocharger. However, the stable operating range is usually restricted by the occurrence of flow instability such as stall and surge. The paper experimentally examines the developing process of surge and stall occurring in a centrifugal compressor to advance the understanding on flow mechanism of flow instability. It is found that three types of pressure fluctuation can be observed at low flowrate region. At the critical point, the local stall firstly occurs in some specific diffuser passages and the enlarged local diffuser stall eventually induces the mild surge of compression system indicated by the sinusoidal pressure fluctuation. At lower mass flow rate, the diffuser stall cell begins to circumferentially propagate along the impeller rotating direction at 11% of rotor speed with the existence of mild surge. In comparative analysis of IGV pre-swirl angle on the occurrence of mild surge, the mild surge still occurs at the operating condition when the slope of the characteristic map of test stage is still obviously negative, in which the compression system is supposed to be stable in previous study. And a new suggested criterion for the prediction of mild surge is demonstrated that the occurrence of mild surge depends on the destabi-lization effect of downstream components about diffuser and volute. Combined with the experimental data, the streamwise distribution characteristic of diffuser stall can be used to develop the simplified model of lumped parameters for the analysis on the generation mechanism of the diffuser rotating stall. The quantitative investigation on the relation between the pressure-rise characteristic of subcomponents and the occurrence of mild surge and diffuser rotating stall not only advances the prediction of stability limit but also lays the theoretic foundation for controlling these unsteady behaviors to improve the operating range.

Keyword :

centrifugal compressor mild surge transient measurement diffuser rotating stall

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GB/T 7714 Zhao Yang , Xi Guang , Zou HanSen et al. Experimental investigation of transient characteristics of mild surge and diffuser rotating stall in a centrifugal compressor with vaned diffuser [J]. | SCIENCE CHINA-TECHNOLOGICAL SCIENCES , 2020 , 63 (7) : 1212-1223 .
MLA Zhao Yang et al. "Experimental investigation of transient characteristics of mild surge and diffuser rotating stall in a centrifugal compressor with vaned diffuser" . | SCIENCE CHINA-TECHNOLOGICAL SCIENCES 63 . 7 (2020) : 1212-1223 .
APA Zhao Yang , Xi Guang , Zou HanSen , Sun YaWei , Wang ZhiHeng . Experimental investigation of transient characteristics of mild surge and diffuser rotating stall in a centrifugal compressor with vaned diffuser . | SCIENCE CHINA-TECHNOLOGICAL SCIENCES , 2020 , 63 (7) , 1212-1223 .
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A Study on the Hub Side Leakage of Centrifugal Compressor in Steady State and Transient Process EI CSCD
期刊论文 | 2020 , 41 (8) , 1903-1910 | Journal of Engineering Thermophysics
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Abstract :

In this paper, in view of the leakage of bearing lubricating oil and gas during start-up and acceleration of high pressure ratio centrifugal compressor system, a lumped parameter model including impeller, vaneless diffuser & volute, hub side seal and pipe is established, and 3-D CFD model is used to obtain the aerodynamics performance of the main compressor components and the hub side seal. The critical boundary line of the flow pressure rise curve of the compressor is calculated, and the maximum threshold value of the valve opening at each speed is obtained; in the meantime, the difference of compressor performance and backflow boundary between transient process and steady state is predicted. The research provides a theoretical reference for explaining the leakage of bearing lubricating oil and gas during the start-up and acceleration of high-speed centrifugal compressor, and puts forward a control scheme for the flow rate of compressor in such process. © 2020, Science Press. All right reserved.

Keyword :

Centrifugal compressors Lubricating oils Seals Centrifugation Computational fluid dynamics

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GB/T 7714 Guo, Yun-Peng , Xi, Guang , Wang, Zhi-Heng . A Study on the Hub Side Leakage of Centrifugal Compressor in Steady State and Transient Process [J]. | Journal of Engineering Thermophysics , 2020 , 41 (8) : 1903-1910 .
MLA Guo, Yun-Peng et al. "A Study on the Hub Side Leakage of Centrifugal Compressor in Steady State and Transient Process" . | Journal of Engineering Thermophysics 41 . 8 (2020) : 1903-1910 .
APA Guo, Yun-Peng , Xi, Guang , Wang, Zhi-Heng . A Study on the Hub Side Leakage of Centrifugal Compressor in Steady State and Transient Process . | Journal of Engineering Thermophysics , 2020 , 41 (8) , 1903-1910 .
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Judging of machining feasibility and calculation of midsection for the five-axis milling of shrouded centrifugal impeller EI
期刊论文 | 2020 , 37 (7) , 360-369 | Journal of Industrial and Production Engineering
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Cavities with various geometries are widely used in the aircraft industry, spacecraft industry, ships, petrochemical engineering, and so on. As a typical example of the representative and difficult cavities, shrouded centrifugal impeller has been studied to meet the higher requirements for the high-grade advanced products. For the five-axis milling, geometric modeling parameterized by the double three-cubed Non-Uniform Rational B-Splines form of the shrouded centrifugal impeller was set up as the base of this study. The target machining cavity of the shrouded centrifugal impeller channel was calculated. The methods to judge any point in the midsection exhibiting the projection point on the inlet surface and every point in the midsection showing the projection point on the inlet surface were obtained. Moreover, the method to calculate the final midsection was proposed. For verifying these methods, the simulation of machining of a shrouded centrifugal impeller was finally proposed. © 2020 Taylor & Francis Group, LLC.

Keyword :

Impellers Milling (machining) Cutting tools Centrifugation

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GB/T 7714 Fan, Hong-Zhou , Cao, Yan-Long , Xi, Guang . Judging of machining feasibility and calculation of midsection for the five-axis milling of shrouded centrifugal impeller [J]. | Journal of Industrial and Production Engineering , 2020 , 37 (7) : 360-369 .
MLA Fan, Hong-Zhou et al. "Judging of machining feasibility and calculation of midsection for the five-axis milling of shrouded centrifugal impeller" . | Journal of Industrial and Production Engineering 37 . 7 (2020) : 360-369 .
APA Fan, Hong-Zhou , Cao, Yan-Long , Xi, Guang . Judging of machining feasibility and calculation of midsection for the five-axis milling of shrouded centrifugal impeller . | Journal of Industrial and Production Engineering , 2020 , 37 (7) , 360-369 .
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