Numerical simulation of acoustic performance of Helmholtz watermuffler for centrifugal pumps
YUAN Jian-Ping-1, 2 , JIN Rong-1, CHEN Hong-Liang-3, FU Yan-Xia-1, SUN Wei-1
(1.Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013,China; 2.Faculty of Built Environment and Engineering, Queensland University of Technology, Brisbane QLD 4001, Australia; 3.Zhejiang Water Conservancy and Hydropower College, Hangzhou, Zhejiang 310018, China)
Abstract In order to reduce the noise issued from centrifugal pump pipelines, the pressure fluctuations at the pump were calculated under different operating conditions by using the software Ansys CFX. The pressure fluctuations characteristics were investigated. Moreover, the acoustic performance of Helmholtz watermuffler with inner and outboard neck, different lengths of neck, parallel necks, series and parallel resonator cavity was analyzed by means of the acoustic software Sysnoise. The simulated results show that the length of neck, connection type between neck and resonator cavity affect the resonant frequency and transmission loss of Helmholtz watermuffler regularly. One more resonant frequency can appear in series and parallel resonator cavities, but the resonant frequencies in series cavities move towards both ends of the resonant frequency of each single cavity with slightly degraded transmission loss. Further there are interactions among the resonant frequencies in the cavities. The resonant frequencies in parallel cavities move towards the inside of two resonant frequencies each single cavity with increased transmission loss. Meanwhile, the interactions among the resonant frequencies in the cavities do not exist.
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