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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2017, Vol. 38 ›› Issue (12): 121384-121384.doi: 10.7527/S1000-6893.2017.121384

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Cooling and infrared radiation suppression effect of plug trailing-body of two-dimensional vector plug nozzle

ZHENG Jiansheng1, SHAN Yong1, ZHANG Jingzhou1,2   

  1. 1. Jiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
    2. Collaborative Innovation Center for Advanced Aero-Engine, Beijing 100083, China
  • Received:2017-05-03 Revised:2017-07-18 Online:2017-12-15 Published:2017-07-18
  • Supported by:
    National Nature Science Foundation of China (U1508212, 51306088)

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.

Key words: two-dimensional plug nozzle, plug cooling, infrared radiation suppression, vector deflection, numerical simulation

CLC Number: