Control of Shock Oscillations with Successive Ramps in a Hypersonic Inlet–Isolator
Publication: Journal of Aerospace Engineering
Volume 36, Issue 6
Abstract
The unstable movement of the shock train in a hypersonic inlet–isolator always brings difficulty to its closed-loop control, and some methods should be taken to stabilize the shock. The flow control method, for example a ramp, developed for a design condition cannot adapt to a wide range of flight conditions. Therefore, a control method of the shock oscillation based on the multistability is proposed and investigated numerically. Successive ramps with different configurations are involved to achieve the local stable regions within the shockwave–boundary layer interaction region. First, the uncontrolled case is studied. With a specified backpressure ratio, the first separation shock exhibits a limit cycle oscillation within the shockwave–boundary layer interaction region, and the downstream flow also fluctuates violently. Then, the controlled case demonstrates that the shock oscillation can be effectively suppressed by the multiple favorable pressure gradient regions induced by the ramps. In addition, with an enhancement in the number and height of the ramps, both the separation shock and the downstream flow are stabilized.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant No. 12002281), the Foundation of National Key Laboratory of Science and Technology on Aerodynamic Design and Research (Grant No. D5050210004), and the Fundamental Research Funds for the Central Universities of China (Grant No. D5000210080).
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Published In
Journal of Aerospace Engineering
Volume 36 • Issue 6 • November 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Nov 7, 2022
Accepted: Jun 5, 2023
Published online: Aug 11, 2023
Published in print: Nov 1, 2023
Discussion open until: Jan 11, 2024
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