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research-article

Influence of Impinging Wall Ramping Modification on the Flow Field of Open Cavity at M=2.0

[+] Author and Article Information
Saranya VS

B.I.T Mesra Ranchi
saranyavs993@gmail.com

Priyank Kumar

Assistant Professor, B.I.T Mesra Ranchi
priyankkumar@bitmesra.ac.in

Sudip Das

Professor, B.I.T Mesra Ranchi, Department of Space Eng. & Rocketry, Birla Institute of Technology Mesra, Ranchi, India - 835215
sudipdas2410@gmail.com

1Corresponding author.

ASME doi:10.1115/1.4039247 History: Received July 29, 2017; Revised November 22, 2017

Abstract

Studies were made to understand the flow features around an open cavity at Mach 2.0 corresponding to Re=0.55×106 based on the cavity depth. Experiments were carried out using a blowdown type Supersonic Wind Tunnel having a test section size of 50mm×100 mm. Oil flow and schlieren flow visualisation were made to understand the steady flow features inside the cavity. Unsteady pressures were measured at several locations to obtain the fluctuating flow field details and the pressure spectrum. Impinging wall modifications of the cavity were made with an objective to reduce the Rossiter's mode frequencies and its amplitude. Partial ramping of the impinging wall with variations in height and angles were made. With adoption of a specific combination of the impinging wall height and angle, the first two modes of the multiple tonal characteristics could be reduced significantly. The present adopted method could result in 74% reduction of RMS pressure and a noise reduction of 11 dB.

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