1. RJTF Mach 8 tests of a scramjet engine with strut and ramp compression
- Abstract
To improve combustion efficiency and the inlet start condition, a scramjet model with a ramp combined with a single strut was tested under Mach 8 flight conditions at the Ramjet Engine Test Facility of the Ramjet Propulsion Research Center. The attached ramp shielded some of the fuel injectors. The fuel flow rate from the open injectors to the flow path was designated as the effective fuel flow rate. In the tests, a combustion efficiency of 90 percent was attained with vertical injection of hydrogen fuel. The thrust increase was 590 N at the effective equivalence ratio of 1.3. However, because the engine geometry was not optimized, a sufficient increase in thrust was not attained. The high temperature and high pressure necessary for ignition and combustion were achieved by the ramp. When the pressure in the isolator was 160 times that of the free-stream air due to combustion, the inlet was in the started condition despite the high pressure. This improved started condition was attained by using the ramp to increase the pressure in the inlet., ラムジェットエンジン試験設備(RJTF)におけるマッハ8条件での始動性および燃焼性能を改善するために、ストラットに加えてランプを取り付けたスクラムジェットエンジン模型の試験を行った。燃料を垂直噴射した時に、エンジン出口での燃焼効率は約90%であった。当量比1.3の条件時に、590Nの推力増加を測定した。しかしながら最適化されていないエンジン形状であったために、十分な推力増加は得られなかった。着火および燃焼に必要な高い温度および圧力が、ランプの装着によって達成された。燃焼器内圧が、エンジンに流入する気流圧力の160倍に達した場合にも、インレットは始動状態を保つことができた。これはランプを用いてインレット内圧力を上昇させた効果による。, Technical Report of National Aerospace Laboratory, 航空宇宙技術研究所報告
- Published
- 2015