关键词: 火箭发动机;塞式喷管;结构参数;数值模拟;性能分析

Abstract: Based on numerical simulation, the effects of cell area ratio, cell type and plug truncation on the aerospike nozzles performance were investigated. The plug dimensions under different configurative parameters were also compared. Aerospike nozzles have better performance when the cell is in under-expansion or optimum-expansion than in over-expansion at sea level. Aerospike nozzles with 2-D cells (rectangle throat and exit) have the highest efficiency. Aerospike nozzles with round throat square exit or round throat rectangle exit cells have almost the same efficiency, but their efficiency is a little lower than that of aerospike nozzles with 2-D cells. If the truncation of plug is shorter,the aerospike nozzles efficiency is lower. The performance differences of aerospike nozzles with different plug truncations become less when nozzle pressure ratio is raised. The effect of plug length on the performance of aerospike nozzles is decreased when plug length increases.

Key words: Rocket engine;Plug nozzle;Structure parameter;Numerical simulation;Performance analysis