Abstract
The three-dimensional characteristics and performance of the flow field in the inlet of the scramjet engine were numerically simulated by CFD software. The flow characteristics in the width direction of the inlet and the influence of the aspect ratio on the performance of the inlet were studied. The calculation results show that the inlet flow has obvious three-dimensional characteristics, and the flow field structure is different in the width direction from the middle symmetrical section to the side wall surface, the Mach number is smaller and smaller, the static pressure is lower and lower, and the static temperature is higher, the greater the total pressure. The aspect ratio has little effect on the Mach number and static temperature of the outlet section of the inlet, but it has a great influence on the static pressure and total pressure. Within a reasonable range, the aspect ratio is doubled, the static pressure is increased by about 40%, and the total pressure is increased by about 84%. The inlet flow coefficient and the total pressure recovery coefficient increase as the aspect ratio increases. Within a reasonable range, the aspect ratio is doubled, the inlet flow coefficient is increased by approximately 53%, and the total pressure recovery coefficient is increased by approximately 83%.
Highlights
Hypersonic vehicles have a wide range of applications in the military and civilian fields in the future, and research institutes at home and abroad have actively carried out research and have made remarkable achievements
The flow characteristics in the width direction have a great influence on the performance of the inlet
The aspect ratio is doubled, the inlet flow coefficient is increased by approximately 53%, and the total pressure recovery coefficient is increased by approximately 83%.The main reason is the ratio of the complex ThreeDimensional Flow Field versus the whole flow field is different, so the performances of different aspect-ratio air-inlets are different
Summary
Hypersonic vehicles have a wide range of applications in the military and civilian fields in the future, and research institutes at home and abroad have actively carried out research and have made remarkable achievements. Researchers have carried out a large number of experiments and numerical simulations on the structure optimization, performance evaluation, flow and combustion calculation of the scramjet engine and its inlet. The flow characteristics in the width direction have a great influence on the performance of the inlet. The aspect ratio of the inlet becomes the important parameter that affects the whole inlet and even the whole scramjet, which must be paid great[5, 6]. Recent researches reflect that it may influence the characteristics of airinlet inner flow field when importing side-wall compression in the compacting board of air-inlet. The numerical simulation on characteristics and performances of the three-dimension scramjet air-inlet flow field was carried out in this paper, the detailed characteristics of inlets’ inner flow field and the influence of the aspect-ratio on air-inlet performance were studied
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