等面积混合模型与等压混合模型的理论比较

Theoretical Comparison of Constant-area Mixing Model and Constant-pressure Mixing Model

利用一维定常流理论,建立了超声速引射器中从混合段到扩压器出口的冷气流混合模型。经过计算,得到了在不同的输入条件下,等面积混合模型和等压混合模型的恢复压力。比较结果,发现等压混合并不总是优于等面积混合,并得出了判断等面积混合与等压混合优劣的条件。在更改参考文献中的部分输入参数后,得出了同样的结论。

The one-dimension mixing model is established from steady state theory, thus the recovery pressures of constant-area mixing model and constant-pressure mixing model are attained. The result implies that the performance of constant-pressure mixing is not always better than that of constant-area mixing, so a criterion is established to estimate the better one of the two mixing models. The consistent conclusion is attained by altering some of the initial parameters in reference.