摘要
为了获得冷态下径向冷却通道长度对新型跨流式气冷稳定器气动热力性能的影响,基于Navier-Stokes方程,对在额定工况下5组不同径向冷却通道长度的该气冷稳定器模型进行了三维流固耦合传热数值模拟研究,得到了气冷稳定器外部流场、径向稳定器外壁面的冷却效率、加力燃烧室热混合效率和总压恢复系数的变化规律。在研究的参数范围内,结果表明:径向冷却通道长度的增加,首先,加强了气冷稳定器后的湍流掺混,使得回流区内湍动能极大值增加了24.3%;其次,会减弱径向稳定器近中心锥处的外壁面冷却效果,导致径向稳定器迎风侧外壁面平均冷却效率降低了14.4%;随着径向冷却通道长度的增加,加力燃烧室沿程热混合效率分布曲线随之向上移动;加力燃烧室沿程总压恢复系数分布曲线随之向下移动,加力燃烧室出口总压恢复系数下降了0.23%。
To study radial cooling channel length changing impact on a new cross-flow type air cooled flameholder in cold flow field,based on the work condition in afterburner,using Navier-Stokes equations the 3 D fluid-solid coupling heat transfer models of five air cooled flameholders with different radial cooling channel length were simulated. The external flow field of air cooled flameholder,the cooling efficiency of the outer wall surface of the radial flameholder,the thermal mixing efficiency and the total pressure recovery coefficient of the afterburner changing law were obtained. Within the range of parameter in this study,results indicate that the increase of the radial cooling channel length firstly enhances the turbulence mixing after the air cooled flameholder,so that the maximum of turbulent kinectic energy in the recirculation zone increases by 24.3%,and secondly weakens the cooling effect of the outer wall surface of the radial flameholder near the inner cone,resulting in the average cooling effect decreases of 14.4% on the radial flameholder＇s windward side. Due to the increase of the radial cooling channel,thermal mix efficiency distribution curve along the afterburner moves upward,total pressure recovery coefficient distribution curve along the afterburner moves downward,and total pressure recovery coefficient at outlet of afterburner decreases by 0.23%.
出处
《推进技术》
EI
CAS
CSCD
北大核心
2018年第2期308-316,共9页
Journal of Propulsion Technology
关键词
径向冷却通道长度
气冷稳定器
冷态流场
冷却性能
热混合效率
流动损失
Radial cooling channel length
Air cooled flameholder
Cold flow field
Cooling performance
Thermal mixing efficiency
Flow loss
