主要结构参数对直排塞式喷管性能的影响

Effects of primary configurative parameters on the performance of linear aerospike nozzles

关键词:  火箭发动机  塞式喷管  结构参数  数值模拟  性能分析

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

摘要:

数值模拟了内喷管面积比、内喷管型式和塞锥截短对塞式喷管性能的影响,比较了不同结构参数选择下对应的塞锥尺寸。内喷管在地面处于欠膨胀和完全膨胀时塞式喷管的性能高于内喷管在地面处于过膨胀时的性能;内喷管为矩型喉部矩型出口二维喷管的塞式喷管效率最高,内喷管为圆喉方型出口和圆喉矩型出口的塞式喷管性能接近,但都比具有二维内喷管的塞式喷管效率稍低;塞锥截得越短,塞式喷管的效率越低,不同塞锥截短率塞式喷管的性能差别随着压比的增加而减小;随着塞锥长度的增加,塞锥长度对塞式喷管性能的影响逐渐降低。

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.