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论文:2018,Vol:36,Issue(5):919-925 |
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引用本文： |
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景婷婷, 何国强, 侯志远, 李文强, 秦飞, 张铎. RBCC燃料支板主动冷却的换热特性研究[J]. 西北工业大学学报 |
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Jing Tingting, He Guoqiang, Hou Zhiyuan, Li Wenqiang, Qin Fei, Zhang Duo. Thermal Analyses of Active-Cooled Strut in RBCC Engine[J]. Northwestern polytechnical university |
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| RBCC燃料支板主动冷却的换热特性研究 |
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| 景婷婷, 何国强, 侯志远, 李文强, 秦飞, 张铎 |
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| 西北工业大学 航天学院 燃烧、热结构与内流场重点实验室, 陕西 西安 710072 |
| 摘要: |
| 针对典型的宽域工作火箭冲压组合循环发动机中的主动冷却燃料支板的基准构型，采用经过校验的数值模拟方法，开展了前缘半径、壁厚、流量分配方式对支板冷却效果的影响因素分析，完成了支板主动冷却通道的几何参数及流量分配策略的参数优选研究。结果表明，在其他参数相同的条件下，前缘热流随着前缘半径的增大而减小，且横截面温度分布更加均匀，但同时对支板的气动性能影响也逐渐增大；另外，壁厚的增大会降低支板的冷却效果，且壁厚越小，在前缘上的热流分布越均匀；同时，通过对比3种冷却剂分配方式的数值模拟结果可知，冷却剂更多地分配给前缘等受热严重区域可以增强特征区域的冷却效果，但全部集中在支板前缘会增大通道内压力损失，因此由尖劈部分的多个通道进入的分配方案最优，既能提高前缘冷却效率，又能保证对其他部分的有效冷却。通过开展支板主动冷却通道布局优化和影响规律分析，显著降低了燃料支板对冷却流量的需求，并为燃料支板的主动冷却结构设计提供了依据。 |
| 关键词:
燃料支板
主动冷却
数值模拟
流量分配
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| Thermal Analyses of Active-Cooled Strut in RBCC Engine |
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| Jing Tingting, He Guoqiang, Hou Zhiyuan, Li Wenqiang, Qin Fei, Zhang Duo |
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| Science and Technology on Combustion, Internal Flow and Thermo-Structure Laboratory, School of Astronautics, Northwestern Polytechnical University, Xi'an 710072, China |
| Abstract: |
| Fuel-injection strut is an efficient way to increase the depth of fuel penetration and strengthen the mixing process of hot gas in supersonic combustor. With a validated numerical model, this article analyzed the effects of leading edge's radius, wall thickness and mass flow distribution on cooling efficiency of fuel-injection strut and proposed an optimizing strategy for active-cooled strut. Results showed that the larger radius of leading edge not only decreased the heat flux on the leading edge, but also has a negative effect on the aerodynamic performance of strut; and a thinner wall could enhance the cooling efficiency and uniformize the temperature distribution of the wedge; furthermore, the flow distribution of inlet coolant had a significant impact on the heat transfer and flow processes, an optimized way of flow distribution was obtained by comparing three different ways of distribution. |
| Key words:
strut
active-cooling
numerical simulation
flow distribution
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| 收稿日期: 2017-09-09
修回日期:
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| DOI: |
| 基金项目: 国家自然科学基金（51706185，51506180）资助 |
| 通讯作者:
Email： |
| 作者简介: 景婷婷(1990-),女,西北工业大学博士研究生,主要从事组合发动机的热防护系统设计研究。
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| 景婷婷 在本刊中的所有文章 |
| 何国强 在本刊中的所有文章 |
| 侯志远 在本刊中的所有文章 |
| 李文强 在本刊中的所有文章 |
| 秦飞 在本刊中的所有文章 |
| 张铎 在本刊中的所有文章 |
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