Numerical study is presented that investigates effects of using sulfur hexafluoride, SF 6 , as a substitute for air. Inviscid results for airfoils indicate that for transonic cases the shock location calculated for SF 6 is vastly different from that in air and moves progressively forward on the airfoil as the freestream pressure is increased and real gas effects become more pronounced.
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W. Kyle Anderson (1991) studied this question.
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