发射井引射器的工作特性

Working characteristic of silo ejector

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和取值范围。结果表明:第一极限、引射面积零点和等速点不能达到;在未达到第三极限时,引射器工作特性服从静压协调函数;在第三极限和最小极限之间工作特性曲线服从最优静压函数;在过雍塞状态,引射器工作特性服从最小静压函数。研究结果为发射井和引射器的优化设计提供了重要指导。

Considering 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 and ranges of the engine total pressure,the cross-sectional area of the silo and the outlet pressure of the mixing chamber were analyzed.This proved impossible to achieve the first limit of ejector,the zero points of the cross-sectional area of secondary flow and the constant velocity point;when the third limit of the ejector was not reached,the characteristic curve was subjected to the static pressure matching function;when the state of the ejector ranged from the third limit to the minimum limit,the characteristic curve was subjected to the optimal static pressure function;when the ejector worked in the over-congestion state,the characteristic curve was subjected to the minimum static pressure function.The results provide an important guidance for the design of silos and ejectors.