, Volume 23, Issue 4, pp 285-298
Date: 24 Aug 2012

Steady energy deposition at Mach 5 for drag reduction

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Experiments addressing the effect of energy deposition via arc discharge on \(15^\circ \) half angle-truncated cone-cylinder configurations at Mach 5 flow were carried out. The arc discharge was accomplished using a setup that consisted of a power supply, a high voltage unit and tungsten electrodes. Discharge-on tests were compared to discharge-off tests to evaluate the net effect of the energy deposition. Flow visualisation revealed the presence of a heated wake downstream of the energy spot. Compression waves were observed on top of the wake of the heated channel, which were oscillatory in nature. The deposited energy of 7 W shows a repeatable influence on the measured drag force for all the models at close arc-to-nose distances.

The paper was based on work that was presented at the 28th International Symposium on Shock Waves, 17–22 July, 2011, Manchester, UK.
Communicated by A. Sasoh.