Transitional and Turbulent Heat-Transfer Measurements on a Yawed Blunt Conical Nosetip
Transitional and turbulent heat-transfer rates measured on a blunt (RN = 2.5 in.) nine degree half-angle cone in a Mx = 5 air flow at various angles of attack are presented. Measurements were made at nominal freestream Reynolds numbers of 48.5,19, and ll(10)6/ft and nominal angles of attack of a = 0°, 5°, 10°, 15°, 20 , and 27°. The wall to stagnation temperature ratio varied between 0.20 and 0.29. Detailed circumferential (A0 « 30°) and axial (S/RN ^ 5.25) distributions of both the heat-transfer rate and surface pressure were obtained over the entire model at each test condition and angle of attack. Natural transition occurred on the hemisphereical cap near the stagnation region at the Re^ = 48.5 and 19(10)6 test conditions. Heat-transfer rates computed along inviscid surface streamlines using various simplified heat-transfer formulations are compared to the data. The Vaglio-Laurin type turbulent heat-transfer formulations are shown to be in good agreement with the data at all test conditions, while those formulations which use reference rather than edge conditions to define the local rate, substantially overpredict the heattransfer rate over the entire surface. The applicability of the angle-of-attack turbulent heat-transfer correlation previously proposed by Widhopf is demonstrated for the present test results.