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http://dx.doi.org/10.5139/IJASS.2008.9.2.098

The Affects of Molecular Properties of Motive Gas on Supersonic Ejection  

Jin, Jung-Kun (Division of Aerospace Engineering, KAIST)
Kwon, Se-Jin (Division of Aerospace Engineering, KAIST)
Kim, Se-Hoon (Agency for Defense Development)
Publication Information
International Journal of Aeronautical and Space Sciences / v.9, no.2, 2008 , pp. 98-106 More about this Journal
Abstract
The motive gas of a supersonic ejector is supplied from different sources depending on the application. The performance of an ejector that is represented by the secondary flow pressure, starting and unstarting pressures heavily depends on the molecular properties of the motive gas. The effects of specific heat ratio of the motive gas were investigated experimentally for an axi-symmetric annular injection type supersonic ejector. Both the starting pressure and unstarting pressure, however, decreased with the increase of the specific heat ratio of the motive gas. It was discovered that the secondary flow pressure increased as the specific heat ratio of the motive gas decreased even if the stagnation pressure of the motive flow was invariant. However, when the motive gas flow nozzle area ratio is large enough for the motive gas to be condensed, different tendency was observed.
Keywords
Ejector; Chemical laser; Condensation;
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