摘要
利用Fluent软件对蒸汽喷射器内二维流场进行数值模拟计算,研究工作流体压力、背压、喷嘴位置对喷射性能的影响,并对喷射器流场内激波的产生、发展和结束进行了分析。结果表明,蒸汽喷射器工作流体压力、工作背压、喷嘴位置在特定的工况下都具有相对应的最优值。激波产生和结束的位置对喷射器性能影响很大:当第一激波由喷嘴出口产生并延伸到混合段出口附近时结束、第二激波在扩散室入口附近结束时,引射系数最大;当激波过早或过晚结束时,都会影响喷射器的性能。
The Fluent software was used to simulate the two-dimensional flow field in a steam ejector,and the effect of working fluid pres-sure,back pressure and nozzle position on the jet performance was studied,and the development and end of the shock wave in the flow field of the ejector were analyzed.The results show that the working fluid pressure,back pressure,nozzle position of the steam ejector all have corre-sponding optimal value at certain conditions,and the shock wave generation and end position have a great influence on the performance of the ejector.When the first shock wave is produced by the nozzle exit and extended to the outlet vicinity of the mixing section,the second shock wave is ended at the inlet of the diffusion chamber,the ejection coefficient is the largest.When the shock is ended too early or too late,the performance of the ejector will be affected.
作者
赵丽娟
ZHAO Lijuan(College of Mechanical Engineering,Ningxia Institute of Science and Technology,Shizuishan Ningxia 753000,China)
出处
《机床与液压》
北大核心
2019年第20期134-137,共4页
Machine Tool & Hydraulics
基金
“十三五”宁夏回族自治区优势特色学科项目(宁教高办[2015]110号)
