多级降压疏水调节阀流致噪声数值模拟研究

Flow-induced noise of a high pressure drop control valve

特殊工况用高参数调节阀在使用过程中出现的高噪声是阀门参数化设计和优化设计必须考虑的重要问题之一。建立高压降多级降压疏水调节阀三维模型,以流致噪声理论为基础,结合RNG k-ε和声学边界元方法(BEM),研究了套筒式减压结构不同结构设计参数对噪声特性的影响规律。研究表明:套筒节流区域的流体压力脉动程度最强,是诱发噪声的主要区域;不同套筒结构参数的调节阀噪声频谱均呈现明显的宽频特性;声压级随套筒孔径的增大而增大,较小的套筒孔径对调节阀的流致噪声有更强的抑制作用;声压级随套筒间隙的增加呈先递减后递增的变化规律,在套筒间隙为8 mm时声压级达到极小值51.02 dB(A)。

The high noise that occurs during the operation process of high-parameter control valves in special working conditions is one of the important issues that must be considered in the valve’s parametric design and optimization design. Based on the flow-induced theory, the RNG k-ε method and BEM were jointly used to simulate and study the influences of elements parameters of a multi-stage steam trap on the sound pressure, distribution and spectrum characteristics of flow induced noises. The results show that the throttling zones, where the pressure pulsation is the strongest, are the main sound source of flow-induced noise;the flow induced noises in the control valves with different sleeve structure parameters;are all of distinct broad spcetrum characteristics;the sound pressure level(SPL) of the noise rises as the sleeve diameter increases, which means that the sleeve with smaller diameter could curb the flow-induced noise better;the SPL decreases first and then increase as the sleeve clearance increases, when the sleeve clearance is 8 mm, the SPL reaches its minimum 51.02 dB(A).