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Affiliation of Author(s):能源与动力学院

Journal:Hangkong Xuebao

Abstract:A numerical investigation is performed to study cooling and infrared radiation suppression of the plug trailing-body of a two-dimensional plug nozzle at a primary flow total temperature of 920 K and a cooling flow temperature of 470 K. The effects of the multi-hole perforated percentage (ranging from 1% to 4%), cooling air usage (limited in 4.3% of the primary mass flow rate) and vector angle (ranging from 0° to 20°) on cooling and infrared radiation suppression of the plug trailing-body are analyzed. The results show that the plug trailing-body cooling has an effective role in decreasing the surface temperature and suppressing infrared radiation intensity. The multi-hole perforated percentage of 2% seems more reasonable. Once coolant usage is increased beyond 2.85% of the primary mass flow rate, the increase of coolant usage has a weak influence on further reduction of surface temperature. The cooling action on the plug trailing-body with coolant usage of 2.85% of the primary mass flow rate is capable of suppressing the infrared radiation intensity about 50% relative to the un-cooled nozzle on the horizontal detective plane. On the vertical detective plane, the cooling action on the plug trailing-body shows more significant influence on infrared radiation suppression. The vector angle has a weak influence on surface temperature distribution. However, the distribution of infrared radiation is seriously affected by vector deflection. © 2017, Press of Chinese Journal of Aeronautics. All right reserved.

ISSN No.:1000-6893

Translation or Not:no

Date of Publication:2017-12-25

Co-author:Zheng, Jiansheng,Shan, Yong

Correspondence Author:zjz