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Effect of wall length on an interacting supersonic rectangular jet

T.V.S. Manikanta (Department of Aerospace Engineering, Madras Institute of Technology, Chennai, India)
B.T.N. Sridhar (Department of Aerospace Engineering, Madras Institute of Technology, Chennai, India)

Aircraft Engineering and Aerospace Technology

ISSN: 0002-2667

Article publication date: 26 June 2024

Issue publication date: 9 July 2024

62

Abstract

Purpose

This study aims to study the interaction effects between a rectangular supersonic jet with a flat wall computationally using wall length as a parameter. The purpose of this study is to investigate the effect of change in wall length on supersonic core length (SCL) reduction, jet deflection and jet decay behavior.

Design/methodology/approach

The design Mach number and aspect ratio at the rectangular exit were 1.8 and 2, respectively. To study the wall length effects on jet-wall interactions, wall length (Lw) was varied as 0.5Dh, 1Dh, 2Dh, 4Dh and 8Dh, where Dh was the hydraulic diameter of the nozzle exit. The flat wall with the matching width of the rectangular exit section of a supersonic nozzle was placed at the nozzle exit such that the supersonic jet grazed past the wall. The studies were carried out at over-expansion [nozzle pressure ratio (NPR) = 4], near optimum expansion (NPR = 6) and under-expansion (NPR = 8) levels.

Findings

Results indicated that significant reduction in wall-bounded SCL was noticed in the range of 0.5Dh Lw 1Dh for both over-expansion and under-expansion conditions. At Lw 4Dh, SCL got enhanced at NPR = 4 and 6 but had a negligible effect at NPR = 8.

Practical implications

Thrust vector control, noise reduction and easy take-off for high-speed aircraft.

Originality/value

The effect of change in flat wall length on interaction characteristics of a rectangular supersonic jet was not studied before in terms of SCL reduction and jet decay behavior.

Keywords

Acknowledgements

The authors of the paper are thankful to the staff and students in the Propulsion Laboratory, Department of Aerospace Engineering, MIT Campus, Anna University, for their assistance in conducting experiments. The authors are also grateful to the Department of Aerospace Engineering, MIT Campus, Anna University, Chromepet for providing the computational facility with ANSYS – CFD software to carry out the numerical simulation study.

Funding. This research did not receive any specific grant from funding agencies in the public, commercial or not-for-profit sectors.

Citation

Manikanta, T.V.S. and Sridhar, B.T.N. (2024), "Effect of wall length on an interacting supersonic rectangular jet", Aircraft Engineering and Aerospace Technology, Vol. 96 No. 5, pp. 736-746. https://doi.org/10.1108/AEAT-10-2023-0262

Publisher

:

Emerald Publishing Limited

Copyright © 2024, Emerald Publishing Limited

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