Research progress of noise in pressure reducing valve
CHEN Fuqiang, WANG Fei, WEI Lin, QIAN Jinyuan, JIN Zhijiang
1. Institute of Process Equipment, Zhejiang University, Hangzhou, Zhejiang 310027, China; 2. Hangzhou Special Equipment Inspection & Research Institute, Hangzhou, Zhejiang 310003, China; 3. Department of Energy Sciences, Lund University, Lund 22100, Sweden
In order to comprehensively understand the specific noise generation process inside pressure reducing valves (PRV) and its existing research outcomes, here the generation of noise in PRV along with its research methods in China and abroad was summarized. Then, the current research status of noise reduction technologies was reviewed from two aspects: source and propagation. Based on analysis and summarization, the major existing problems in current noise reduction technologies were discussed, including complex flow situation in PRV, ambiguity of vortex location and uncertain in interaction between highvelocity jet flows and so on. In the future investigation of noise reduction in PRV, it is advised that the position of noise source in valve should be determined first through combination of theoretical analysis, experiment and numerical analysis. Then, the directivity of noise in the valve can be clarified. Thereby, a further study of noise reduction mechanism and technology can be launched. Finally, noise in PRV can be reduced to the utmost extent. In the future, control of noise inside PRV should start with flow mechanism and structural innovation, and then a universal valve design theory with low noise will be put forward. Investigation into noise characteristics in pressure reducing valve can provide a reliable basis for reducing noise effectively.