Investigation of Hypersonic Compression Ramp Heating at High Angles of Attack

To clarify the relationship of the e ow structure and the heating characteristics of blunt-nose e at plates with a compression ramp, an experimental and analytical study of the hypersonic aerodynamic heating characteristics at high angles of attack has been conducted. The effect of nose bluntness and angle of attack on the heating pattern of the compression ramp has been explored, and the relationship between the ramp heating and the shock/shock interaction of the bow, separation, and compression corner shocks were examined. Triple-shock interaction plays an important role in determining the state of the e ow downstream of the bow/separation shock interaction point and the resulting ramp heat transfer distribution. The interaction around theramp may beidentie ed as variations ofan Edney typeI, V, orVI interaction (Edney, B., “ AnomalousHeat Transferand PressureDistributionson Blunt Bodies at Hypersonic Speeds in the Presence of an Impinging Shock,” Aeronautical Research Inst. of Sweden, FFA Rept. 115, Stockholm, Feb. 1968 ). Numerical simulation of the interacting e owe eld using two-dimensional laminar calculations showed discrepancy with an experimental heat transfer distribution for cases of large bluntnosee at platesathigh anglesofattack.Exploratory studiesoftwo-dimensionalandthree-dimensionalcalculations were conducted for fully laminar, fully turbulent, and transitional e ow conditions to examine the reason for this discrepancy. The three-dimensional calculation showed satisfactory agreement with the experimental shock shape and separation length.