Reevaluation of Window-Cooling Test Data: HEDI Window-Cooling Test in the AEDC HR Arc Heater
Abstract
Multiple experiments were conducted in the late 1980's and early 1990's to determine the effectiveness of transpiration and film cooling on the temperature control of an infrared (IR) seeker window during a missile's 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 Center's (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, AEDC/Naval 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 09, 2000
- Accession Number
- ADA386555
Entities
People
- E. J. Felderman
- J. H. Stewart