二次流对超声速环型空气引射器真空度的影响

The Effects of Second-flow on the Vacuum-degree of Annular Supersonic Air Ejector

采用计算流体力学时间相关法求解二维轴对称Navier Stokes方程,数值模拟求解了二维轴对称超声速环型空气引射器流场。在前期工作基础上,探讨了零二次流时盲腔压强平衡的机理和二次流对引射器真空度的影响。计算表明,二次流对引射器的流场结构影响显著,与零二次流相比,少量的二次流将使引射器真空度大大下降。

The timedependent method of the computational fluid dynamics is applied to solving the 2dimensional axisymmetric NavierStokes equations, and the flowfields of the 2dimensional axisymmetric annular supersonic airejectors are simulated. Based on the previous work, the balance mechanism of the blindcavity is considered and the effect of the secondflow on the ejected vacuum is discussed. It's found that the existence of secondflow has an important effect on the flowfield structure of the ejector, and that in comparison with the zerosecondflow condition, a little of the secondflow will reduce the ejector vacuum remarkably. 