缩放型喷嘴产生的空化射流流场数值模拟

Numerical simulation for cavitation water jet flow field through convergent-divergent nozzle

应用Standardk-ε,RNGk-ε和Standardk-ω湍流模型对缩放型喷嘴内部湍流流场进行数值模拟,结合理论及质量流量测试试验对数值模拟结果进行对比验证。结果表明:RNGk-ε湍流模型最适合用于数值模拟缩放型喷嘴内部的湍流流场;RNGk-ε湍流模型数值模拟结果显示缩放型喷嘴收缩角使喷嘴喉管部产生了低压场,压差的产生使水射流的空化效果得到了提高。

The turbulent field in a nozzle was numerically simulated by Standard k -6, RNG k -6 and Standard k -ω turbulent models. The constrast check for simulated results was done by combining the theory analysis and experiments of mass flow rates. The results show that the RNG k - ε is the most suitable model. The numerical simulation results of RNG k - ε turbulent model show that the reduction angle of convergent-divergent nozzle has significantly influence on the parameters of jet flow field. It can form low pressure field in nozzle throat, and the pressure difference can improve the cavatition effect of high pressure water jet.