注水系统三级节流降噪设计及数值分析

大压差工况下,流量调节阀的节流作用导致自流注水系统振动噪声问题突出。为控制自流注水系统的噪声,从系统配置的角度进行系统降噪优化设计,提出了多级节流的降噪方案。采用流体动力学数值方法进行了多级节流低噪声设计原理分析,验证了多级节流降噪方案的有效性。基于低噪声设计原理,设计了三级流量调节阀串联的节流注水方案,并对三级节流系统进行了流场数值分析,数值分析结果表明:三级节流设计使各级阀后低压区减小,避免了阀后局部气蚀出现;一级阀门和二级阀门进口下缘及出口上缘均出现大尺度的漩涡结构,为主要噪声源区域。

Three stage throttling noise reduction design and numerical analysis of water injection system

Under the condition of high pressure difference, the throttling effect of flow control valve results in the problem of vibration and noise. In order to control the noise of the water injection system, this paper makes a low noise optimization design from the viewpoint of system configuration and proposes a noise reduction scheme for multistage throttling. The principle of low noise design is analyzed by numerical method of fluid dynamics, which verifies the effectiveness of the multilevel throttling scheme. Based on the principle of low noise design, three stage flow control valves in series are designed to control the flow in this paper. Then the paper numerically analyzes the flow field and sound field, and the analysis results indicate that the three stage throttling design makes the low pressure area smaller and the local cavitation reduced behind valves,,a large scale vortex structure appears at the lower edge of the inlet and the upper edge of the outlet of the first two stage valves.