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http://dx.doi.org/10.6108/KSPE.2012.16.2.058

Experimental Study on the Flow Hysteresis Phenomenon in a Supersonic Nozzle  

Nam, Jong-Soon (안동대학교 대학원 기계공학과)
Kim, Heuy-Dong (안동대학교 대학원 기계공학과)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.16, no.2, 2012 , pp. 58-64 More about this Journal
Abstract
Hysteresis phenomena in fluid flow systems are frequently encountered in many industrial and engineering applications and mainly appear during the transient processes of change of the pressure ratio. Shock-containing flow field in supersonic nozzles is typically subject to such hysteresis phenomena, but associated flow physics is not yet understood well. In the present study, experimental work has been carried out to investigate supersonic nozzle flows during the transient processes of change in the nozzle pressure ratio. Time-dependent surface wall pressures were measured by a multiple of pressure transducers and the flow field was visualized using a nano-spark Schlieren optical method. The results obtained show that the hysteresis phenomenon is strongly dependent on the nozzle geometry as well as the time scale of the change of pressure ratio.
Keywords
Compressible Flow; Hysteresis Phenomenon; Shock Wave; Supersonic Nozzle; Supersonic Flow;
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