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http://dx.doi.org/10.3795/KSME-B.2005.29.8.934

Study of Starting Pressure of a Supersonic Ejector with a Second-Throat  

Jin, Jung-Kun (한국과학기술원 대학원 항공우주공학)
Kwon, Se-Jin (한국과학기술원 대학원 항공우주공학)
Kim, Se-Hoon (한국과학기술원 항공우주공학)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.29, no.8, 2005 , pp. 934-939 More about this Journal
Abstract
Starting pressure of a supersonic ejector with a second-throat was investigated. In case of mixing chamber length longer than a critical length, starting pressure is in proportion to length of the mixing chamber. In this study, we assumed that the ejector starts when the primary supersonic flow reaches inlet of the second-throat and the distance of the supersonic flow traveling can be expressed by multiplying an empirical factor to the first diamond shock length of overexpanded flow. To calculate the overexpanded supersonic flow, a mixing model was employed to compute secondary flow pressure and the result was applied to back pressure condition of overexpanded flow calculation. In the result, for three cases of primary nozzle area ratio, we could get accurate model of predicting the starting pressure by selecting a suitable empirical factors around 3.
Keywords
Supersonic Ejector; Hysteresis; Starting Pressure; Mixing Model; Overexpanded Flow;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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