MHD-Arc-Scramjet联合循环发动机的性能分析

Performance analysis of MHD-Arc-Scramjet combined cycle engine

以MHD-Arc-Scramjet联合循环发动机为对象开展性能分析，探讨了能量旁路系统对发动机性能的影响，给出了MHD-Arc-Scramjet联合循环发动机相对于传统冲压发动机的单位推力差异。结果表明：电子束电离消耗的能量，能量旁路比例，电弧注入过程的最高温度以及进气道的压缩程度是能量旁路系统中影响发动机单位推力的主要因素；在这些参数的取值范围内合理取值，并兼顾材料和技术实现等约束，性能分析表明：在来流速度2800-4000m／s范围内MHD-Arc-Scramjet联合循环发动机相对传统冲压发动机具有明显的单位推力优势。

The performance of a MHD-Arc-Scramjet combined cycle engine is analyzed by investigating the effect of energy-bypass system on the engine specific thrust and presenting the difference of the specific thrust between the MHD-Arc-Scramjet combined cycle engine and a conventional scramjet. Results show factors including energy used for electric-beam ionization, energy-bypass ratio, the maximum temperature of arc-heating process and the degree of inlet compression, impose significant effects on the engine specific thrust, and it is evident that with the proper choice of the above parameters the specific thrust of MHD-Arc-Scramjet combined cycle engine is higher than that of the conventional scramjet in the speed range of 2 800-4000 m/s.