推进技术 ›› 2021, Vol. 42 ›› Issue (4): 941-949.DOI: 10.13675/j.cnki.tjjs.200575

• 爆震推进技术应用基础 • 上一篇    下一篇

高热流密度燃烧室壁面阵列空气射流-燃油组合冷却结构研究

吴青,谭晓茗,田佳,张靖周   

  1. 南京航空航天大学 能源与动力学院,航空飞行器热管理与能量利用工信部重点实验室,江苏 南京 210016
  • 出版日期:2021-04-15 发布日期:2021-04-15
  • 作者简介:吴 青,硕士,助教,研究领域为高温壁面冷却方式。E-mail:15261805029@163.com

Integrated Cooling Configuration of Array Air Jets and Fuel Cooling for High-Heat-Flux Combustor Wall

  1. Key Laboratory of Thermal Management and Energy Utilization of Aircraft,College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China
  • Online:2021-04-15 Published:2021-04-15

摘要: 针对高热流密度燃烧室壁面热防护需求,提出了一种空气阵列射流冲击和燃油冷却肋板的集成冷却方式,在射流平均雷诺数Rej为1×104~3×104,燃油进口流速vf为2.33~5.23m/s内,采用数值模拟方法对其传热特性进行了研究,并基于壁面加热侧当量对流换热系数的概念,分析了基准肋板以及燃油冷却肋板的传热增强作用。与无肋板靶面的阵列射流冲击相比,带肋板阵列射流冲击的面积平均当量对流换热系数是前者的1.6倍,压力损失系数相对提高了约25%;采用燃油冷却肋板,加热壁面综合传热能力进一步增强,在Rej=1×104时,采用燃油冷却肋板的面积平均当量对流换热系数是基准肋板的1.5倍以上,即使在Rej=3×104时,燃油冷却肋板的传热增强比也可以达到1.2;燃油冷却肋板的出口温度相对进口温度的提升在20~50K内,其提升幅度随着射流雷诺数或燃油进口流速的增大而减小。

关键词: 空气阵列射流;燃油冷却肋板;集成冷却结构;综合传热性能;数值模拟

Abstract: An integrated cooling configuration was proposed by using array air-jets and fuel-cooled ribs to meet the thermal protection requirement in the high-heat-flux combustor wall. Numerical simulations were performed to characterize its heat transfer performance under a certain jet Reynolds number range (1×104Rej≤3×104) and fuel inlet velocity range (2.33m/s≤vf≤5.23m/s). Based on the equivalent convective heat transfer coefficient on the heated side of target plate, the overall heat transfer enhancement by using baseline ribs and fuel-cooled ribs is illustrated. With respect to the no-rib situation, the presence of ribs in array-jet impingement makes the area-averaged equivalent convective heat transfer coefficient 1.6 times of the former. At the same time, the pressure loss coefficient otherwise increased about 25% relatively. By using the fuel-cooled ribs, the overall heat transfer capacity is further promoted. When compared to the baseline-rib situation, the heat transfer enhancement ratio in the viewing of area-averaged convective heat transfer coefficient is up to 1.5 under Rej=1×104. Even under Rej=3×104, the heat transfer enhancement ratio for the fuel-cooled ribs is 1.2 at least. Totally, the temperature rise of the fuel at outlet with respect to the inlet temperature increased about 20~50K. This temperature rise is reduced with the increase of jet Reynolds number and fuel inlet velocity.

Key words: Array air jets;Fuel-cooled ribs;Integrated cooling structure;Overall heat transfer performance;Numerical simulation