Effects of Air Intake Structures on Cooling and Infrared Radiation Characteristics of Two-Dimensional Plug nozzle

被引：0
|
作者：
Chen J. [1 ,2 ]
Shan Y. [1 ,2 ]
Zhang J.-Z. [1 ,2 ]
Zhang X.-Y. [1 ,2 ]
机构：
[1] Key laboratory of Thermal Management and Energy Utilization of Aircraft, Ministry of Industry and Information Technology, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing
[2] Key Laboratory of Inlet and Exhaust System Technology, Ministry of Education, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing
来源：
Tuijin Jishu/Journal of Propulsion Technology | 2023年 / 44卷 / 11期
关键词：
2-D plug nozzle; Air intake structure; Cooling performance; Infrared radiation characteristic; Numerical simulation; Plug cooling;
D O I：
10.13675/j.cnki.tjjs.2207042
中图分类号：
学科分类号：
摘要：
In order to reduce the surface temperature of two-dimensional plug and the infrared radiation intensity of nozzle in the state of afterburning，the cooling structure of plug was designed. A series of numerical simulations were performed to investigate the effects of air intake structure，cooling channel height and total pressure ratio of inlets on the plug cooling and nozzle infrared radiation performances. The calculation results indicate that：the surface temperature of plug and the infrared radiation of nozzle have dropped significantly after the plug is cooled. The change of air intake angle leads to different core region of jet when there is no impact plate in the air intake chamber，which caused remarkable difference in the spanwise temperature distributions of the plug head and leading edge. While the air intake angle is 90°，the maximum temperature of the plug surface is 50K higher than that of 30° and 60°. After the impact plate is installed，the flow distribution in the cooling channel and the spanwise temperature distribution of the plug leading edge are effectively improved as well as the heat transfer of the plug head，however，a large total pressure loss is also caused. Therefore，the mass flow of cooling air decreases and the external surface temperature of the plug increases when an impact plate existed in a fixed total pressure ratio of inlets. A higher cooling channel brings a bigger mass flow rate and a less flow velocity of cooling air，so there is an optimal height of the passage to make the cooling effect on the plug best. Compared with the situation of un-cooled plug，with the total pressure ratio of inlets varying from1.0 to 1.8，the maximum temperature of the external surface of plug decreases by 470K to 590K and the infrared radiation intensity decreases by 25% to 33% at the detection angle of 0°. © 2023 Journal of Propulsion Technology. All rights reserved.
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