Reevaluation of Window-Cooling Test Data: HEDI Window-Cooling Test in the AEDC HR Arc Heater
SVERDRUP TECHNOLOGY INC ARNOLD AFS TN
Pagination or Media Count:
Multiple experiments were conducted in the late 1980s and early 1990s to determine the effectiveness of transpiration and film cooling on the temperature control of an infrared IR seeker window during a missiles hypersonic flight. These efforts were made in support of the United States Army Space and Strategic Defense Command USA SSDC High-Endoatmospheric Defense Interceptor HEDI program. The experiments were designed as a series of complementary tests in several facilities that would provide the data necessary to predict window-cooling requirements. Recent emphasis on a similar missile system program, Atmospheric Interceptor Technology AIT, has prompted a re- evaluation of the HEDI database of ground test data and led to new analysis of experimental results from one of the high-temperature facilities, Arnold Engineering Development Centers AEDC HR arcjet. While the HR test objective was oriented toward survivability issues and was conducted at a smaller scale 40 percent vs. 75 to 100 percent and different geometry 2-D wedge vs. tetracone, window- cooling effectiveness results are in excellent agreement with other national facilities and the literature. Comparisons of the window-cooling data from AEDC Tunnels B and C, Calspan Hypersonic Shock Tunnel HST and HEDI facilities, AEDCNaval Surface Warfare Center NSWC Tunnel 9, and AEDC HR are presented. In addition, the film-cooling effectiveness parameter, freestream turbulence, test article scale, and window-cooling breakpoint are discussed. Finally, new AEDC high-temperature facility capabilities are presented.
- Unmanned Spacecraft