Abstract
Experiments addressing the effect of energy deposition via arc discharge on 15 ◦ half angle truncated cone-cylinder configurations and a truncated cone with flare configuration in Mach 5 flow were carried out. The arc discharge was accomplished using a setup that consisted of power supply, high voltage unit and tungsten electrodes. Discharge-on cases were always compared to Discharge-off to evaluate the net effect of energy deposition. Visual observations revealed that there is a certain size of the relaxation distance as the test gas sweeps the energy spot downstream forming a heated wake. The compression waves occur on top of the wake of the heated channel and oscillatory in nature. The deposited energy of 10W has its repeatable influence on drag force for all the models. The effectiveness was found to be increasing with increased truncation or the frontal area up to a point and from thereon it started to decrease. In case of the distance between the energy spot and the frontal face, the efficiency is maximum when the distance is shortest and from thereon it decreases to a point and stays nearly constant.
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