Abstract

蒸汽喷射器可以有效利用余热资源,是一种节能环保的流体机械。采用计算流体力学（CFD）软件对蒸汽喷射器进行三维数值模拟,研究了喷嘴出口马赫数、混合室长度、等截面积混合段长度和扩压室长度对喷射器引射比和临界压力的影响。模拟结果表明:混合室长度存在一个最佳值,且最佳混合室长度与喷嘴出口马赫数有关;等截面积混合段长度和扩压室长度对引射比的影响不大,但是会影响喷射器的临界压力。研究结果对于蒸汽喷射器的设计和结构优化有一定的意义。

Steam ejector can efectively utilize the waste heat resources，which is an energy-saving and environment-friendly fluid machine.Computational fluid dynamics (CFD)is employed to investigate the optimization of geometry parameters for design of high performance steam ejector.The efects of the Mach number at nozle exit，the length of mixing chamber，the length of constant-area section and the length of difuser on the performance of the ejector are studied by thre-dimensional numerical simulation.The simulation results show that there is an optimal length of mixing chamber.The optimal length of mixing chamber is related to the Mach number at the nozle exit.The length of constant-area section and the length of difuser have litle efect on the entrainment radio.But it plays an important role in the critical presure.The results are provided a good solution for the structure optimization of steam ejector.