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http://dx.doi.org/10.6108/KSPE.2012.16.2.051

Control of the Base Pressure of the Supersonic Jet Using an Orifice  

Lee, Jong-Sung (안동대학교 대학원 기계공학과)
Kim, Heuy-Dong (안동대학교 기계공학부)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.16, no.2, 2012 , pp. 51-57 More about this Journal
Abstract
Base pressure at the base of high-speed jet has long been one of the important issues from both the view points of fluid dynamics as well as practical engineering applications. The base pressure characteristics of incompressible flows have been well known to date. However, the base pressure at transonic or supersonic speeds would be different due to the compressibility effects and shock waves. In the present paper, a CFD study has been performed to understand the base pressure characteristics at transonic and supersonic speeds, prior to experimental work. An emphasis is placed on the control of the base pressure using a simple orifice. A variety of supersonic jet plumes have been explored to investigate the flow variables influencing the base pressure. The results obtained were validated with existing experimental data and discussed in terms of the base pressure and discharge coefficient of the orifice.
Keywords
Compressible Flow; Orifice; Base Pressure; Discharge Coefficient; Supersonic Nozzle;
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