Coupling Mechanism and Control Methods of Transonic Shock Oscillation and Cavity Flow

YIN Lixiao; ZHAO Xiaojian

doi:10.15892/j.cnki.djzdxb.2025.02.015

Abstract

Transonic shock oscillations and cavity flows are both primary contributors to the intense pulsating pressures and structural vibrations in laterally maneuverable rocket missiles. However, existing studies have predominantly focused on single flow characteristics impacting on the wall load environment, while neglecting the coupling effects between two unsteady flow phenomena. This oversight poses potential risks to the flight safety of aerospace vehicles under specific flight conditions. In this study, a rocket fairing and a sidewall cavity structure are employed as the research subjects. The Delayed Detached Eddy Simulation (DDES) method is utilized to conduct a numerical investigation into the flow field characteristics and the time-frequency properties of pulsating pressures in the presence of both transonic shock oscillations and cavity flows, aiming to explore the coupling mechanisms between shock oscillations and cavity flows. The research findings indicate that cavity flows reduce the effect of separated flows on the shock, thereby weakening the intensity of transonic shock oscillations, while shock oscillations stabilize the cavity flow field, significantly lowering the sound pressure level (SPL) on the cavity walls, maximally, which can reach up to 30 dB at Mach 0.95. Based on the flow dynamics cognition in coupled transonic flow fields, 3 flow control strategies for the coupled flow field are designed. Comparative results reveal that a steep rise in leading edge of the cavity promotes the mutual inhibition of shock oscillations and cavity flows, thereby reducing the pulsating pressure levels on the cavity walls. The analysis of the coupled flow field involving transonic shock oscillations and cavity flows provides valuable support for the development of next-generation aerospace vehicles.

Key words： transonic flow; shock oscillation; cavity flow; pressure fluctuations; flow control

Cite this article

YIN Lixiao , ZHAO Xiaojian . Coupling Mechanism and Control Methods of Transonic Shock Oscillation and Cavity Flow[J]. Journal of Projectiles, Rockets, Missiles and Guidance, 2025 , 45(2) : 241 -250 . DOI: 10.15892/j.cnki.djzdxb.2025.02.015

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