Abstract
Understanding the flow characteristics over a double compression ramp is crucial for high-speed vehicle design. Leading edge bluntness is a key factor influencing the formation of a separation region on a double compression ramp flow. In the present study, the effect of bluntness on a double compression ramp is investigated experimentally at a nominal Mach number of 4. The test model has 13° and 40° inclinations with respect to the freestream. Five different levels of leading-edge radius, varying from 0.0 to 2.0 mm, were subjected to supersonic wind tunnel tests. Shadowgraph and infrared thermography techniques were employed to visualize the flow features of the double ramp model. Measurements of surface heat-transfer along the centerline of the test model were obtained from the acquired infrared images. It is shown that the leading-edge radius alters the separation characteristics as well as the surface heat-transfer. Possible reasons for such flow characteristics are discussed.
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Acknowledgments
This work was supported by Defense Acquisition Program Administration and Agency for Defense Development (No. UD130042CD). This work was carried out in the Department of Aerospace Engineering at Konkuk University. The authors would like to thank Mr. Jaeho Lee and Dr. Sungmin Lee for their technical help in operating the supersonic wind tunnel.
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Ikhyun Kim received his Ph.D. degree in 2019 from KAIST. He is currently a Visiting Scholar in the Hypersonic Research Group at Oxford Thermofluids Institute. His research interests include highspeed aerothermodynamics and hypersonic gas-surface interaction.
Gisu Park received his Ph.D. degree in 2010 from the University of New South Wales. He is currently an Associate Professor in the Department of Aerospace Engineering at KAIST. His research interests include hypersonic flows and high-speed ground-tests.
Young Hwan Byun received his Ph.D. degree from the University of Maryland in 1988. He is currently a Professor in the Department of Aerospace Engineering at Konkuk University. His research interests include high-speed ground-tests and shock wave dynamics.
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Kim, I., Park, G. & Byun, Y.H. Experimental investigation of the effects of leading edge bluntness on supersonic flow over a double compression ramp. J Mech Sci Technol 34, 4193–4199 (2020). https://doi.org/10.1007/s12206-020-0911-z
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DOI: https://doi.org/10.1007/s12206-020-0911-z