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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2022, Vol. 43 ›› Issue (12): 126056-126056.doi: 10.7527/S1000-6893.2021.26056

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Drag reduction and heat protection mechanism of annular jet and combined jet

ZHANG Daoyi, ZHOU Chaoying   

  1. School of Mechanical Engineering and Automation, Harbin Institute of Technology (Shenzhen), Shenzhen 518000, China
  • Received:2021-07-05 Revised:2021-07-20 Published:2021-08-17
  • Supported by:
    Basic Research Project of Shenzhen Science and Technology Program (JCYJ20170307151117299)

Abstract: In order to analyze the influence of annular composite jet on drag and heat reduction of aircraft surface, this paper studies the influence of different sizes of annular jet and combined jet on the hypersonic reverse jet under the off-design condition by taking the annular reverse jet of the hemispherical head body as the research object. The result shows that as the size of the annular jet nozzle increases, the critical spray pressure ratio of the long-short modal conversion will decrease; in the combined jet, the larger the annular nozzle size, the smaller the center nozzle size and the greater the critical spray pressure ratio of the long-short modal transition. It is concluded that annular jets have a better heat reduction effect than traditional central jets, and the size of combined jet has a certain influence on the maximum heat flow peak position.

Key words: hypersonic, annular jet flow, combined jet flow, long and short penetration modes, heat reduction

CLC Number: