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| 超燃冲压发动机支板热性能研究 |
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宋冈霖1,2,田 亮1,冮 强3,王 辽3,徐 旭1
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(1.北京航空航天大学 宇航学院,北京 100191;2.中国西昌卫星发射中心,四川 西昌 615606;3.中国航天科工集团三十一研究所 高超声速冲压发动机技术重点实验室,北京 100074)
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| 摘要: |
| 针对双模态超燃燃烧室内分别处于上游(高速、较低总温)和下游(较低速、高总温)不同热环境下十字交叉布置的支板,通过数值仿真,从材料选择、辐射影响程度及主被动热防护措施三方面研究了支板换热问题,并且研究了不同冷却水流速对支板前缘冷却性能的影响。结果表明:上游支板受气动加热影响比下游支板显著；对于所计算工况,考虑支板与气体之间的辐射作用后,上下游支板前缘温度均下降约150K；对下游支板进行主动冷却效果明显,冷却水流速为10m/s能满足长时间工作要求。 |
| 关键词: 超燃冲压发动机 支板 辐射 热防护 冷却 |
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| A Study for Scramjet Strut Thermal Performance |
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SONG Gang-lin1,2, TIAN Liang1, GANG Qiang3, WANG Liao3, XU Xu1
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(1.School of Astronautics, Beijing University of Aeronautics and Astronautics,Beijing 100191, China;2.China Xichang Satellite Laumch Center,Xichang 615606,China;3.Sicence and Technology on Scramjet Laboratory, The 31st Research Institute of CASIC, Beijing 100074, China)
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| Abstract: |
| Numerical simulations were performed to investigate the effects of material and radiation heat transfer on the heat exchange of two struts in a dual-mode scramjet combustor. One strut was installed in the front of the combustor corresponding to an inflow condition of high speed and low stagnation temperature, the other was installed in the rear of the combustor corresponding to an inflow condition of low speed and high stagnation temperature. Some active and passive thermal protection systems were introduced, and the influence of the cooling water velocity on the cooling performance of the downstream strut leading edge was also investigated. The results show that the upstream strut suffers more obviously aerodynamic heating than the downstream one. After considering the radiation between the struts and air, the leading edge temperature of both struts decreases approximately 150K. The active cooling has an obvious influence on the downstream strut, which can operate in a long duration at a cooling water velocity of 10m/s. |
| Key words: Scramjet Strut Radiation Thermal protection Cooling |
