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Effects of backpressure on unstart and restart characteristics of a supersonic inlet

Published online by Cambridge University Press:  20 April 2023

K. Wang Open the ORCID record for K. Wang [Opens in a new window] ,
J.Y. Wang ,
H.X. Huang ,
L.R. Xie ,
Y. Liu  and
H.J. Tan
K. Wang*
Affiliation:
College of Energy and Power Engineering, Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing University of Aeronautics and Astronautics, Nanjing, China
J.Y. Wang
Affiliation:
School of Aeronautics and Astronautics, Sun Yat-sen University, Guangzhou, China
H.X. Huang
Affiliation:
College of Energy and Power Engineering, Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing University of Aeronautics and Astronautics, Nanjing, China
L.R. Xie
Affiliation:
College of Energy and Power Engineering, Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing University of Aeronautics and Astronautics, Nanjing, China
Y. Liu
Affiliation:
Chinese Fight Test Establishment, Xian, China
H.J. Tan
Affiliation:
College of Energy and Power Engineering, Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing University of Aeronautics and Astronautics, Nanjing, China
*
Corresponding author: K. Wang; Email: kunwang@nuaa.edu.cn
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Abstract

The unstart phenomenon of supersonic inlets caused by backpressure is dangerous for aircraft during flights because it severely reduces the air mass flow rate through the engine. We used unsteady numerical simulations to evaluate the unstart and restart characteristics of a two-dimensional supersonic inlet during rapid backpressure changes. The effects of the depressurisation time and depressurisation value on the inlet flow characteristics and restart features are discussed. The results show that the depressurisation time affects the restart procedure when the back pressure drops from the inlet unstart value to the normal working state value. When the depressurisation time decreases, it becomes easier for the inlet to restart. However, the inlet cannot restart if the depressurisation time is too long. When the depressurisation time and value were large enough, a short buzz period occurred before the inlet restarted. Both the time and value of depressurisation affected the restart characteristics.

Keywords

Supersonic inletBackpressureUnstartRestartNumerical simulation
Type
Research Article
Information
The Aeronautical Journal , Volume 127 , Issue 1316 , October 2023 , pp. 1774 - 1792
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of Royal Aeronautical Society

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