| 引用本文: | 沈斌贤,刘伟强,尹亮.固体药燃气逆向喷流热防护有效性分析.[J].国防科技大学学报,2019,41(2):31-36.[点击复制] |
| SHEN Binxian,LIU Weiqiang,YIN Liang.Effectiveness analysis of opposing jet thermal protection generating with solid fuel[J].Journal of National University of Defense Technology,2019,41(2):31-36[点击复制] |
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| 固体药燃气逆向喷流热防护有效性分析 |
| 沈斌贤, 刘伟强, 尹亮 |
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(国防科技大学 高超声速冲压发动机技术重点实验室， 湖南 长沙 410073)
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| 摘要: |
| 针对高超声速飞行器逆向喷流介质供应，采用固体药燃烧产生的燃气作为喷流的介质，来减小供应系统的质量与体积。采用数值计算的方法对高速飞行器球头逆向喷流流场进行数值模拟，分析不同飞行条件下高温燃气对球头热防护的影响。研究表明，采用高温燃气会减弱逆向喷流的热防护效果，但是对比无逆向喷流的驻点热流，最大热流仍然存在大幅度的下降。通过调节喷流压力，在不增加喷流质量的情况下，高温燃气逆向喷流可以取得与常温介质一致的热防护效果。针对6马赫数以上的飞行，现有的固体药燃气温度能够对飞行器头部实现有效的热防护。 |
| 关键词: 高速飞行器 逆向喷流 热防护 燃气 |
| DOI：10.11887/j.cn.201902005 |
| 投稿日期：2018-01-16 |
| 基金项目:国家部委基金资助项目（9140A13030715KG01187） |
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| Effectiveness analysis of opposing jet thermal protection generating with solid fuel |
| SHEN Binxian, LIU Weiqiang, YIN Liang |
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(Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, China)
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| Abstract: |
| In order to reduce the size of coolant supply system of opposing jet in hypersonic vehicles, the fuel gas generating with solid fuel was adopted as an opposing jet. The RANS (reynolds-average navier-stokes) equations coupled with the Menter′s SST (shear stress transport) model was employed to solve the opposing jet flow field of hypersonic hemisphere model. The typical results have been validated with experiments performed in the literature. The influence of the high temperature fuel gas on the hemisphere model thermal protection characteristics was analyzed with different flying condition. Results show that the high temperature fuel gas weakens the heat flux reduction of opposing jet, but the peak heat flux exhibits a prominent reduction in contrast to that without injection.The cooling efficiency can be strengthened by increasing the jet pressure. With a reasonable jet pressure, the similar cooling efficiency can be obtained compared with that of the normal coolant and it does not result in additional mass flux. Moreover, the three solid fuel and its combustion temperature are listed. For high Mach flying which is higher than 6, the solid fuel can provide required jet temperature for opposing jet thermal protection system. |
| Keywords: hypersonic vehicle opposing jet thermal protection fuel gas |
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