使用量纲一参数进行喷射器性能分析

在以往大量数值模拟工作的基础上,总结出了一定喷射器结构时,喷射器的最大喷射系数、膨胀比及临界压缩比三者之间的关系,并给出了膨胀比与喷嘴出口马赫数之间的幂指数关系.研究表明,用膨胀比和压缩比两个量纲一参数代替具体的工作流体压力、引射流体压力和出口压力,来分析一定结构时工作参数对喷射器性能的影响,可以使模拟所得出的结论不局限于具体的参数值,具有更好的通用性,对指导喷射器设计、提高喷射器性能具有重大意义.

Analysis of ejector performance using dimensionless parameters

From the ample computational results, the relationships among maximum entrainment ratio, expansion ratio and critical compression ratio were concluded. A power correlation between expansion ratio and Mach number at the nozzle outlet was found. Using two dimensionless parameters, namely expansion ratio and critical compression ratio to replace actual motive fluid pressure -- suction pressure and critical discharging pressure to analyze the effect of the operation parameters on the ejector performance, can make the results more universal and useful in ejector designing and ejector efficiency.