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对冲压——火箭发动机冲压级突扩喷射的重要性作了说明并简要地评论了这一领域最近的研究工作之后,本文介绍一种计算椭圆型内部反应流的数值方法。它是把算子分裂法用于物质守恒方程,使这些方程中通常是疑难的积分在两步演算中完成。对于无反应的第一阶段,应用Gosman等人的算法;而有反应的第二阶段,使方程式能改写成一组常微分方程。为处理常常与实际的化学动力学问题有关的刚性,应用Gear的方法对不同的几何构型解该常微分方程组。 实验结果同数值法的预估值很好地相符。发现在靠近喷射处有一强大的回流区。几何构型既影响化学反应又影响流动稳定性:45°喷射引起平均流率的增加,而90°时却不明显。垂直喷射比45°进气好象是更加稳定,这还取决于恰当的构型。
After describing the importance of ramjet-ramjet ramjet and briefly commented on the recent work in this area, this paper presents a numerical method for calculating the elliptical internal reaction flow. It uses the operator splitting method for the conservation of matter, making the normally difficult integrals of these equations done in a two-step calculus. For the first phase of non-reaction, Gosman et al.’s algorithm is applied; and the second phase of reaction allows the equation to be rewritten as a set of ordinary differential equations. To deal with the rigidity often associated with actual chemical kinetics problems, Gear’s method is used to solve this differential system of equations for different geometries. The experimental results are in good agreement with the numerical method. Found near the jet has a strong reflux zone. The geometrical configuration affects both the chemical reaction and the flow stability: the 45 ° jet causes an increase in the mean flow rate, but not at 90 °. Vertical injection appears to be more stable than 45 ° intake, which also depends on the proper configuration.