NDLI: Unsteady shock-flow characteristics in an over-expanded rocket nozzle

Content Provider	Springer Nature Link
Author	Lee, Jong Sung Kim, Huey Dong Setoguchi, Toshiaki Matsuo, Shigeru
Copyright Year	2010
Abstract	A numerical investigation of transient side-loads in an axisymmetric over-expanded thrust optimized contour nozzle is presented. These nozzles experience side-loads during start-up and shut-down operations, because of the flow separation at nozzle walls. Two types of flow separations such as FSS and RSS shock structure occur. A two-dimension numerical simulation has been carried out over an axisymmetric TOC nozzle to validate present results and investigate oscillatory flow characteristics for start-up processes. Reynolds Averaged Navier-Stokes equations are numerically solved using a fully implicit finite volume scheme. Governing equations are solved by coupled implicit scheme. Reynolds Stress turbulence model is selected. Present computed pressure at the nozzle wall closely matched with experiment data. A hysteresis phenomenon has been observed between these two shock structures. The transition from FSS to RSS pattern during start-up process has shown maximum nozzle wall pressure. Nozzle wall pressure and shear stress values have shown fluctuations during the FSS to RSS transition. The oscillatory pressure has been observed on the nozzle wall for high pressure ratio. Present results have shown that magnitude of the nozzle wall pressure variation is high for the oscillatory phenomenon.
Starting Page	332
Ending Page	336
Page Count	5
File Format	PDF
ISSN	10032169
Journal	Journal of Thermal Science
Volume Number	19
Issue Number	4
e-ISSN	1993033X
Language	English
Publisher	SP Science Press
Publisher Date	2010-07-11
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Free shock separation Over-expansion flow Restricted shock separation Side-loads Supersonic nozzle Engineering Thermodynamics, Heat and Mass Transfer Engineering Fluid Dynamics Classical Continuum Physics
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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