减压阀噪声研究进展

为了全面深刻理解减压阀噪声的具体生成过程及现有研究基础，分析了减压阀内噪声产生的机理，总结了目前国内外减压阀噪声的研究方法，并从来源降噪和传播降噪两方面回顾了国内外降噪技术的研究现状.经过分析总结，探讨了目前研究存在的主要问题：减压阀内流动复杂、旋涡流动发生位置不明确和高速射流相互作用的影响不确定等；指出未来方向应在综合理论分析、试验研究和数值模拟的基础上，确定减压阀内噪声源位置并分析噪声指向性，明确降噪机理，进而研究降噪技术，实现根源降噪.未来对减压阀噪声的控制应从流动机理和结构创新同时着手，进而推出一套普适性低噪声阀门设计理论.研究减压阀内噪声可以为有效并针对性地降低噪声提供可靠依据.

Research progress of noise in pressure reducing valve

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 high velocity 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.