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An Experimental Study on Design and Starting Characteristics of a Sub-scale Diffuser for Simulating High-Altitude Environment  

Lee, Yang-Suk (충남대학교 항공우주공학과)
Jeon, Jun-Su (충남대학교 항공우주공학과)
Ko, Young-Sung (충남대학교 항공우주공학과)
Yang, Jae-Jun (한국항공우주연구원 추진기관팀)
Kim, Sun-Jin (청양대학교 소방안전관리학과)
Kim, Jung-Hoon ((주)한화 대전공장 개발부)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.13, no.5, 2009 , pp. 21-28 More about this Journal
Abstract
This experimental study was performed to find the important design parameters and the starting characteristics of a supersonic exhaust diffuser. The experimental study was carried out on a scaled down model of straight cylindrical supersonic exhaust diffuser, in order to evaluate the effects of operating fluid(air, nitrogen), the diffuser inlet area over the primary nozzle throat area($A_d/A_t$), the inlet pressure of primary nozzle, diffuser length over diffuser inner diameter($L_d/D_d$) and existence or nonexistence of diffuser divergence. The test results showed that the starting pressure increased with decrease in diameter of primary nozzle, and the measured starting pressure of the diffuser had approximately 90~98% efficiency as compared with the predicted starting pressure. Also, the diffuser was started at all case, regardless of $L_d/D_d$ (above 8.4) and diffuser divergence. The result of this study can be used as an essential database for developing a simulated high-altitude facility for real-scale model.
Keywords
Diffuser; High-Altitude Environment; Starting Characteristic; Vacuum Chamber; Nozzle Throat;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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