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Numerical Study of Strong Interplay Between Cavity and Store During Launching

Published online by Cambridge University Press:  27 June 2017

P. P. Yan ,
Q. F. Zhang  and
J. Li
P. P. Yan
Affiliation:
Department of MechanicsSchool of Civil EngineeringBeijing Jiaotong UniversityBeijing, China
Q. F. Zhang*
Affiliation:
Department of MechanicsSchool of Civil EngineeringBeijing Jiaotong UniversityBeijing, China
J. Li
Affiliation:
Shenyang Aircraft Design and Research InstituteAviation Industry of ChinaShenyang, China
*
*Corresponding author ([email protected])
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Abstract

Numerical investigation of the strong interplay between a cavity and a store under supersonic inflow condition is conducted by using Improved Delayed Detach-Eddy Simulation (IDDES). Pressure fluctuations in the cavity are analyzed with smooth pseudo Winger-Vile distribution method and the time-frequency features are obtained. The effects of fluctuating flow inside the cavity on the aerodynamic loads of the store are also studied. It was shown that when the store is falling through the shear layer, the self-sustained oscillation loop is destroyed and the cavity tone vanishes. Vortex structures concentrate in the back of the cavity, as a result the noise levels at the rear of the cavity increase. After the store falls out of the cavity, the oblique shock wave formed at store's head interferences with the shear layer, which changes the cavity tone frequencies. The forces and moments acting on the store fluctuate strongly influenced by highly unsteady flow-field. Affected by oblique shock and the impact of shear layer, the store's pitch up angle keeps rising up and reaches to 24° at its maximum.

Keywords

IDDESWeapon launchCavity noiseSmooth pseudo winger-vile distribution
Type
Research Article
Information
Journal of Mechanics , Volume 34 , Issue 2 , April 2018 , pp. 103 - 112
Copyright
Copyright © The Society of Theoretical and Applied Mechanics 2018 

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