Translated Abstract
Seawater pipeline system is widely used in the field of shipbuilding industry. Its internal fluid noise not only seriously affects the work and rest of the staff within the ship, but also restricts the concealment and security of the ship. The installation of water flow muffler in the pipeline system is the most widely used method in the control of fluid noise. However, at present, the research data of the water flow muffler is not a lot, and the foreign research on the water flow muffler has the technical blockade, so the design of high performance water muffler has always been a difficulty. In this paper, the acoustic performance analysis and parameter optimization design of the water flow muffler for the seawater pipeline system are carried out. On the basis of the preliminary study on the performance and parameter optimization of the water flow muffler, a water flow muffler is designed and the experimental study is proceeded.
First of all, the acoustic performance and hydrodynamic performance of the typical water flow muffler are simulated by using the Virtual Lab and FLUENT softwares. The effects of the structure parameters such as the expansion ratio, the length of the expansion cavity , the length of the inserted pipe, the perforation rate, the pore diameter , the wall thickness of the perforated pipe on the acoustic performance and the fluid dynamic performance of muffler are studied in detail, which provides an important guiding role for the following design of muffler.
Parametric optimization of reactive mufflers is carried out. This paper introduces a methodology which combines finite element method and BOBYQA algorithm for parametric optimization of expansion chamber muffler with space constraints and reactive mufflers with extended inlet and outlet ducts. The optimization results show that the optimization method presented in this paper is not only suitable for solving the parametric optimization problems of muffler, but also simple and efficient.
The design and optimization of the water flow muffler are proceeded. According to the specific performance requirements, a water flow muffler is designed from three aspects: the acoustic performance, the dynamic performance and the structural strength. The results of optimal calculation show that the water muffler designed in this paper can not only meet the design requirements of the given space limitation and acoustic attenuation performance, but also meet the requirements of structural strength under the actual conditions.
Finally, experimental study on the straight pipe and water flow muffler designed in this paper are carried out. Straight tube test results show that the test is not accurate enough, however, the use of thick wall straight tube can improve the test accuracy to a certain extent. Water flow muffler test results show that the water flow muffler designed in this paper has a good performance of noise reduction, and the test results of the noise reduction are better to meet the design goal of 15dB noise reduction in the wide frequency band(0-6000Hz).
In this paper, the acoustic performance analysis and parameter optimization design of the water flow muffler are carried out by numerical simulation and experimental test. These studies have important guiding significance and reference value for the optimization design of the water flow muffler in the seawater pipeline system.
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