| 摘要: |
| 采用碳氢燃料冷却壁面是超燃冲压发动机常用主动冷却方式。为减轻主动冷却通道结构重量、提高冷却效率，本文探讨了以网格结构为填充的新型通道，从结构轻质化、流动特性及综合传热能力等方面与常规矩形主动冷却通道进行了比较。结果表明，在相同工况下，由错排网格填充的冷却通道结构综合性能最佳，其减重效果达39.93%，壁面温度显著下降，且努塞尔数最高达到光通道的2.156倍。从流动传热机理分析可看出，网格前缘冲击效应形成的马蹄涡和后缘附近发卡涡结构对强化传热贡献最大，扰动边界层和激发湍动能也是强化传热的重要因素。 |
| 关键词: 超然冲压发动机 主动冷却 网格结构 结构减重 强化传热 超临界流体流动 |
| DOI：10.13675/j.cnki.tjjs.200489 |
| 分类号:V231.1 |
| 基金项目:国家自然科学基金（51876132）；装备预研重点实验室基金（6142703010）。 |
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| Numerical Study on Flow and Heat Transfer Characteristics of Supercritical n-Decane in Cooling Channels with Lattice Arrays |
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YANG Ze-nan1, CHEN Wei1, Minking K Chyu1, JU Yin-chao2, ZHANG Bo2
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1.School of Aeronautics and Astronautics,Sichuan University,Chengdu 610065,China;2.Science and Technology on Scramjet Laboratory,Beijing Power Machinery Institute,Beijing 100074,China
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| Abstract: |
| Using hydrocarbon fuel to cool the combustor is a common active cooling method of scramjet. In order to reduce the weight of the active cooling channel structure and improve the cooling efficiency， new types of channels filled with lattice structure are discussed， and compared with the conventional rectangular active cooling channel in terms of structural weight loss， flow characteristics and heat transfer ability. The results show that， under the same operating condition， the cooling channel with staggered lattice arrays has the best comprehensive performance， for the weight reduction effect reaches 39.93%， the wall temperature drops significantly， and the maximum Nusselt number is 2.156 times of the conventional channel. The flow field analysis shows that horseshoe vortices formed by the impact effect and hairpin vortices near the trailing edge contribute the most to heat transfer enhancement， and the disturbed boundary layer and the excited turbulent kinetic energy are also important factors to enhance the heat transfer. |
| Key words: Scramjet Active cooling Lattice structure Structure weight loss Enhanced heat transfer Supercritical fluid flow |
