合排气二元收敛喷管与发动机流量匹配设计方法

发展了一种基于喷管三维黏性数值分析的内外涵气流质量流量匹配设计方法.该方法主要是通过建立以喷管待定几何参数为未知量的非线性无量纲内外涵气流质量流量匹配方程组,然后采用逐步线性迭代法结合喷管三维黏性数值分析对该非线性方程组进行求解,得到满足发动机内外涵流量匹配的喷管设计方案.通过数值算例验证分析,结果表明：①该方法可以快...

Study on matching method for core and bypass mass flux of 2-D convergent nozzle of mixed flow

A design method of two-dimensional (2-D) convergent nozzle was developed to meet core and bypass mass flux requirements of mixed flow turbofan engine.A matching method for core and bypass mass flux based on three-dimensional (3-D) viscous numerical simulation was proposed.Non-linear dimensionless mass flux matching equations for core and bypass channel with 2-D nozzle were formulated.Solving procedure of the non-linear equations was presented.Numerical simulation and matching results for some nozzle cases indicate that : (1) The method for solving the non-linear mass flux equations is effective,geometric parameters could be determined quickly for 2-D convergent nozzle.(2) Nozzle length and throat area properly play a key role for the required nozzle gross thrust.A nozzle with greater length and smaller throat area has greater gross thrust and better efficiency.