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[Abstract] Electromagnetic control of shockwaves provides a new way to active thermal management and guidance control for the most critical stage of atmospheric entry of hypersonic vehicles. A series of measurement of shockwave formation and locations for high Mach number ionized flows over a spherical nose-cone with cylindrical body and with an applied magnetic field were conducted at NASA Marshall Space Flight Center (MSFC). Shockwave images were recorded using a high speed high resolution video system. This paper analyzes the experimental images to investigate the effect of electromagnetic control on the shockwave stand-off distance. The time history of shockwave stand-off distance was digitally analyzed from the high-speed and high-resolution imaging system. The time history of the critical test control parameters, such as magnet power, arc heater critical performance parameters, test cabin pressure and temperature, NaK injection rate, gaseous nitrogen flow rate was synchronized with the time history of the shockwave image video. Results indicated that the non-dimensional shockwave stand-off distance started to show changes due to when the MHD interaction level reached 0.18. |
