Investigation of Natural Transition on a Sharp Leading Edge Flat Plate in a Hypersonic Shock Tunnel

Bajpai, A and Jagadeesh, G (2023) Investigation of Natural Transition on a Sharp Leading Edge Flat Plate in a Hypersonic Shock Tunnel. In: 25th AIAA International Space Planes and Hypersonic Systems and Technologies Conference, 2023, 28 May 2023 through 1 June 2023, Bengaluru.

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Abstract

Experiments were conducted to investigate transition on a 800 mm long smooth flat plate in Hypersonic Shock Tunnel 4 (HST4) at Laboratory for Hypersonic and Shockwave Research (LHSR), IISc Bangalore. The plate was subjected to three different edge Reynolds number for same edge Mach number of 5.18. The plate was equipped with platinum thin film gauges to measure heat transfer along the length of the flat plate. The measured heat transfer was compared to analytical laminar and turbulent heat transfer in order to ascertain the nature of the boundary layer. Four high frequency response pressure transducers, PCB 132B38, were also placed to measure the pressure disturbances in the boundary layer. As edge Reynolds number increased the boundary layer underwent transition from natural to turbulent. The change in the nature of the boundary layer was recorded by heat transfer gauges which recorded an increase in heat transfer in the transitional and turbulent boundary layer. The change in nature of the boundary layer was also recorded by pressure sensor output which showed presence of high frequency pressure fluctuations which are inherent in the transitional high speed compressible boundary layers. © 2023, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

Item Type:	Conference Paper
Publication:	25th AIAA International Space Planes and Hypersonic Systems and Technologies Conference, 2023
Publisher:	American Institute of Aeronautics and Astronautics Inc, AIAA
Additional Information:	The copyright for this article belongs to the publisher.
Keywords:	Atmospheric thermodynamics; Frequency response; Heat transfer; Hypersonic boundary layers; Laminar boundary layer; Perturbation techniques; Polychlorinated biphenyls, Bangalore; Flat plate; Laminar heat transfer; Natural transition; Platinum thin film; Reynold number; Sharp leading edges; Shock tunnel; Thin-film gages; Turbulent heat transfer, Reynolds number
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	11 Oct 2024 22:33
Last Modified:	11 Oct 2024 22:33
URI:	http://eprints.iisc.ac.in/id/eprint/86433

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