热力学效应对高温高压调节阀空化的影响

Infuence of thermodynamics effect on cavitation of high temperature and high pressure regulating valve

为了研究温度和压力条件对调节阀空化发展的影响,应用计算流体力学软件,基于Singhal空化模型和质量传输方程,并通过导入UDF程序,添加反映热力学效应的计算源项,以节流模型为研究对象,开展空化流动分析。分析结果表明:调节阀降压过程会引起部分能量转化和汽化潜热吸收,介质初温越高,温升越明显;而考虑热力学效应后,节流区域温度升高会引起当地饱和蒸汽压力升高,扩大空化的影响范围。

In order to study the influence of temperature and pressure condition on the cavitation development of control valve,the cavitation field on throttling model was simulated with CFD software based on Singhal cavitation model and mass transport equation.Source term of the thermodynamic effect was added in energy equation by importing UDF codes.The results show that the depressurization process of the control valve would cause the vaporization latent heat absorption and energy conversion,and the higher the temperature of the fluid,the greater temperature increase is in cavity zone.Moreover,the saturated pressure would be increased with the increase of local temperature,and the influence scope of cavitation would be expanded.