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为研究进气道临界总压恢复系数与主要几何特征之间的联系,通过零维流动分析,提出了一种基于流管收缩比计算临界总压恢复系数的理论公式,并与通常采用的基于喉道参数的计算方法进行对比分析,阐述了两种计算方法的不同物理意义。该公式表明,进气道临界总压恢复系数等于流管收缩比、函数K(Ma th)及Q(Ma∞)三项乘积。研究了计算公式中各变量对临界总压恢复系数的影响,分析表明流管收缩比是决定临界总压恢复系数的重要变量。在大多数情况下,流管收缩比与临界总压恢复系数具有正相关的变化规律。
In order to study the relationship between the critical total pressure restoration coefficient and the main geometric characteristics of the inlet, a theoretical formula for calculating the critical total pressure recovery coefficient based on the shrinkage ratio of the flow tube was proposed through zero-dimensional flow analysis. Throat parameters are compared and analyzed, and the different physical meanings of the two methods are expounded. The formula shows that the critical total pressure recovery factor of the inlet is equal to the three products of flow tube shrinkage ratio, function K (Ma th) and Q (Ma ∞). The effect of variables on the critical total pressure recovery coefficient was studied. The results show that the flow tube shrinkage ratio is an important variable to determine the critical pressure recovery factor. In most cases, there is a positive correlation between the tube contraction ratio and the critical total pressure recovery coefficient.