多单元圆转方塞式喷管的性能计算和分析

采用NND差分格式求解三维平均雷诺N-S方程的数值方法,对多单元圆转方塞式喷管的性能进行了计算.首先比较了钟型喷管、二维喷管、圆转方喷管、方形喉部方形出口喷管的流动特点和性能,然后研究了转方位置、转方后型面和出口圆角对圆转方内喷管性能的影响以及圆转方结构型式、内喷管倾角、塞锥型面变化对塞式喷管性能的影响,并且给出了具有较高性能的多单元圆转方塞式喷管设计方案.研究结论对于多单元圆转方塞式喷管的优化设计有一定的参考作用.

Performance calculations and analysis of multi-module aerospike nozzles with round to rectangle inner nozzles

Based on an non-oscillatory and non-free parameters dissipation difference (NND) scheme to solve three-dimensional Reynolds averaged Navier-Stokes equations, performance calculations and analysis of multi-module aerospike nozzles with round to rectangle inner nozzles were investigated. Flow characteristics and performance of four inner nozzles including bell nozzle, two-dimensional nozzle, round to square inner nozzle and square throat to square exit nozzle were compared. Then performance of round to rectangle inner nozzles that have different structures such as contour changing points, contours after changing points and exit arc radiuses were discussed. The effects of different structures of inner nozzles, different nozzle obliquities and different plug contours on the multi-module linear aerospike nozzles were also presented. And a design scheme of the optimized aerospike nozzle was given. Conclusions can provide some reference for studying design of the multi-module linear aerospike nozzles with round to rectangle inner nozzles.