截止节流阀两相流致噪声特性分析

Analysis of Noise Characteristics Caused by Two-Phase Flow in Shut-off Throttle Valve

随着空调技术的发展,新型节流阀如电子膨胀阀、截止节流阀、短管节流阀等代替了毛细管在空调上的应用。但目前对截止节流阀的研究少之甚少,故而对不同流量下截止节流阀的流场进行计算。通过数值计算得到不同工况下的压力场、速度场、声功率级等的分布。结果表明:随着阀门入口流量的增大,阀门节流孔处的最大流速从44.331 3 m/s增大到77.560 4 m/s;随着阀门入口流量的增大,节流孔处的压降也逐渐增大;当阀门入口流量从0.014 kg/s增大到0.024 kg/s,阀门下游最大噪声从104.640 2 dB增大到122.751 5 dB;流场中噪声主要集中在阀门下游和节流孔,且最大噪声出现在阀门下游的直管段末端,噪声的分布特点也为阀门的进一步优化提供方向。

With the development of air conditioning technology,new throttle valves such as electronic expansion valves,shut-off throttle valves and short tube throttle valves are used in air conditioners instead of capillary tubes.However,little research has been done on the shut-off throttle valve,so the flow fields of the shut-off throttle valve were calculated at different flow rates.The distributions of pressure field,velocity field,and sound power level under different operating conditions were obtained by numerical calculations.The results show that:with the increase of valve inlet flow,the maximum flow velocity at the valve throttle increases from 44.3313 m/s to 77.5604 m/s;with the increase of valve inlet flow,the pressure drop at the throttle also increases gradually;when the valve inlet flow increases from 0.014 kg/s to 0.024 kg/s,the maximum noise of the valve increases from 104.6402 dB to 122.7515 dB;the noise in the flow field is mainly concentrated at the downstream of the valve and the throttle orifice,and the maximum noise appears at the end of the straight pipe section downstream of the valve,the distribution characteristics of noise also provide direction for further optimization of valves.