新型蒸汽喷嘴数值模拟研究

Study on Numerical Simulation of New Steam Nozzle

根据蒸汽喷射器中出现的各种新型喷嘴,针对整流喷嘴、调节锥喷嘴、维托辛斯基曲线喷嘴和双层喷嘴进行研究,采用Workbench平台的Fluent软件,水蒸气为介质对同一拉法尔喷嘴基本尺寸模型下的各种新型喷嘴的内部流动在同样的工艺条件下进行了数值模拟;研究得出整流喷嘴、调节锥喷嘴、维托辛斯基曲线喷嘴和双层喷嘴出口速度依次增大。结果表明双层喷嘴提速效果好,维托辛斯基曲线喷嘴消除激波效果好,调节锥喷嘴可方便的调节流量及出口速度,而整流喷嘴不能消除激波且增加整流段长度会增加阻力损失。为喷嘴的合理选择及使用提供了一定依据。

Regarding various kinds of new nozzles appearing in steam ejector,rectifying nozzle,flow-regulated cone nozzle,Vito Hinske curve nozzle and double nozzle were studied.Based on Fluent software of Workbench platform, and using water vapor as medium,numerical simulation was conducted on the internal flow of all kinds of new nozzles under the same Laval nozzle size model with the same process conditions.It was concluded that the outlet velocity of rectifying nozzle,flow-regulated cone nozzle,Vito Hinske curve nozzle and double nozzle increased in order.The results show that,double nozzles can accelerate effectively;Vito Hinske curve nozzies can eliminate shock wave effectively;flow-regulated cone nozzles can adjust the flow and outlet velocity conveniently;rectifying nozzles can't eliminate the shock wave,and increasing the rectifying section length can increase the resistance loss.The results provide a basis for the reasonable selection and use of nozzles.