针对发射井优化设计问题，提出了发射井引射器模型和引射器函数求解方法。研究了静压协调函数的性质，分析了发动机总压、发射井横截面积、混合室出口压强变化时的极限工作条件，讨论了p2-p3图、p2-p*图、p2-D3图上引射速度零点、引射面积零点、第一极限点、第三极限点、等压点和等速点的分布。证明了第三极限点是p2-p3图上的驻点，当p3小于第三极限时引射器p2-p3特性曲线为一平行于水平轴的直线段，当p*大于第三极限时引射器p2-p*工作特性曲线沿着最优静压函数曲线发展，当D3小于第三极限时引射器p2-D3工作特性曲线沿着最优静压函数曲线发展。给出了完整的工作特性曲线变化区间。研究结果为发射井和引射器的优化设计提供了重要指导。
Aiming at the problem of silo design, the silo ejector model and ejector function were proposed. The properties of the static pressure matching function were studied. The critical conditions when the engine total pressure, the cross-sectional area of the silo and the outlet pressure of the mixing chamber changed were analyzed. The velocity zero points, area zero points, first critical points, third critical points, fixed pressure points and fixed velocity points of the ejector on the p2-p3 chart, p2-p* chart and p2-D3 chart were discussed. It is proved that the third limit point is the stagnation point on the p2-p3 chart; when p3 is smaller than the third limit, the p2-p3 characteristic curve is a straight line parallel to the horizontal axis; when p* is greater than the third limit, the p2-p* characteristic curve develops along the optimal pressure function curve; when D3 is smaller than the third limit, the p2-D3 characteristic curve develops along the optimal pressure function curve. Total range of characteristic curves were given. The results provide important guidance for the design of silos and ejectors.
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