二维引射—混合器流场的数值研究与验证

本文运用一维引射特性方程和不可压缩流动Navier-Stokes方程,对二维引射—混合流场进行了数值研究。首先用一维引射特性方程估算理想的引射气流流量;然后用N-S方程对混合管内的气流混合流动进行计算,用计算得到的混合管速度分布和壁面粘性剪切力来修正一维引射特性方程中的经验常数,逐次逼近真实的引射流量比。计算结果表明,本文的数值方法可以有效地预测引射流量比和混合流场。

Numerical Computation and Examination of a Two-Dimensional Mixer-Ejector System

Numerical computation of 2 D flow fields inside a mixer ejector was conducted using one dimensional ejector pumping relationship and full Navier Stokes equations.Firstly,the ideal pumping coefficient was determined based on the one dimensional ejector pumping relationship.Then the coefficients in the one dimensional ejector pumping relationship were corrected according to the velocity distribution and wall friction resulting from the calculation of Navier Stokes equations.The final pumping coefficient can be obtained by repeating the above process until the residual is satisfied.From the comparison between the computation results and experimental data,it is concluded that the present method is reasonable in predicting the mixer ejector pumping capacity.