- An additional drag caused by the air becoming sonic over any portion of the body. Two things cause this drag: first, when the air crosses the shock wave, some energy is lost as drag because the temperature rises across the shock wave. Second, a shock-induced boundary-layer separation increases the drag.Wave drag is caused because of shock induced boundary layer separation that results in temperature rise and because of formation of number of shocklets when the airflow over the body becomes supersonic.
Aviation dictionary. 2014.
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