圆转矩形收敛段型面对喷管流动与红外辐射特性影响  

The Investigation of Flow and Infrared Characteristics of Circle-to-Rectangular C-D Nozzle with a Differently Shaped Convergent Duct

作　　者：崔力 张勃[1] 李基权 林丽冰 艾俊强 CUI Li;ZHANG Bo;LI Jiquan;LIN Libing;AI Junqiang(Jiangsu Province Key Laboratory of Aerospace Power System,College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Department of Conceptual Design,Xi’an Aircraft Design and Research Institute,Xi’an 610041,China)

机构地区：[1]江苏省航空动力系统重点实验室,南京航空航天大学能源与动力学院,江苏南京210016 [2]西安飞机设计研究所总体设计部,陕西西安610041

出　　处：《红外技术》2019年第12期1167-1174,共8页Infrared Technology

摘　　要：针对圆转矩形收扩喷管的收敛段截面面积沿轴向的变化规律进行了优化设计,得到了4种圆转矩形收敛段模型,与相同的矩形扩张段相匹配,形成4种圆转矩形收扩喷管模型,对其气动、换热与红外辐射特征进行了数值研究。得到如下结论:收敛段截面积沿程变化规律对喷管气动与红外辐射特性影响明显:按照前急后缓规律设计的喷管红外抑制效果较差,按照维托辛斯基公式以及缓急相当规律设计的喷管略有增强,而按照前缓后急规律设计的喷管则最佳。这是因为在模型C中随着收敛段截面积沿程收敛速度较快,壁面压力峰值减小,出口旋流增强,尾喷流掺混增强,尾喷流高温区长度减小,尾喷流和喷管红外辐射强度分别降低19.2%和20.6%。Four two-dimensional convergence-diffusion(CD) nozzles were designed with different convergent ducts and their flow, heat transfer, and infrared characteristics were investigated numerically. The results were as follows: the changing speed of the cross-sectional area had a significant effect on the dynamics and infrared suppressing characteristics;the model with a rapid area change at the entrance had infrared suppressing characteristics;the modest area change one had better dynamics and infrared suppressing characteristics;and the slow area change one had the best dynamics and infrared suppressing characteristics. By changing the cross-sectional area, mixing between the hot jet and ambient gas was enhanced, the high-temperature region of the hot jet decreased, the thermal radiation intensity of the hot jet and nozzle cavity was reduced by 19.2% and 20.6% separately in comparison with the C model.

关 键 词：圆转矩形 收扩喷管 截面面积 掺混 红外抑制 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]