Theoretical Prediction of Pressures in Hypersonic Flow with Special Reference to Configurations Having Attached Leading-edge Shock PDF Download

Author: Harold R. Mead
Publisher:
ISBN:
Category : Aerodynamics, Hypersonic
Languages : en
Pages : 190

Get Book Here

Book Description
This report presents the results of an experimental hypersonic research program specifically designed to support an investigation of new theoretical means for the prediction of pressures on attached-shock configurations at hypersonic speeds. An analysis of the data is presented by comparison with the thin-shock-layer theory and the improved shock-expansion theory developed in the analytical program as well as with some of the simplified methods in current favor such as Newtonian, tangent-wedge, equivalent-cone, and shock-expansion methods. It is shown that in appropriate applications the thin-shock-layer theory is superior to any of these simplified methods. However, test conditions did not duplicate those necessary for complete evaluation of the improved shock-expansion theory. In certain instances the influence of viscous phenomena on the results is discussed, especially with regrad to the distinct wing-body combinations. A modified technique for taking vapor screen photographs developed in the course of these tests was found to be particularly helpful in this connection. The pressure tests on the sharp leading-edge wings, bodies, and wing-body combinations wer conducted at M̃5 and 8 in tunnels A and B of the Von Karman Facility of the Arnold Engineering Development Center. The range of test variables were: angles of attack, -10 degress to 20 degrees; angles of yaw, -15 degrees to 15 degrees; Reynolds numbers, 0.83 to 6.0 x 10(superscript 6)/ft.