Passive Prandtl-Meyer Expansion Flow with Homogeneous Condensation

Prandtl-Meyer expansion flow with homogeneous condensation is investigated experimentally and by numerical computations. The steady and unsteady periodic behaviors of the diabatic shock wave due to the latent heat released by condensation are considered with a view of technical application to the co...

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Bibliographic Details
Published in:Journal of mechanical science and technology 2004, 18(3), , pp.407-418
Main Authors: Baek, Seung-Cheol, Kwon, Soon-Bum, Kim, Heuy-Dong
Format: Article
Language:English
Subjects:
Compressibility
Condensation
Condensing
Control methods
Expansion
Finite difference method
Fluid dynamics
Latent heat
Mathematical analysis
Mathematical models
Navier-Stokes equations
Nucleation
Passive control
Porous walls
Prandtl-Meyer expansion
Shock waves
Static pressure
Steam turbines
Studies
Turbine blades
Unsteady
기계공학
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Summary:Prandtl-Meyer expansion flow with homogeneous condensation is investigated experimentally and by numerical computations. The steady and unsteady periodic behaviors of the diabatic shock wave due to the latent heat released by condensation are considered with a view of technical application to the condensing flow through steam turbine blade passages. A passive control method using a porous wall and cavity underneath is applied to control the diabatic shock wave. Two-dimensional, compressible Navier-Stokes with the nucleation rate equation are numerically solved using a third-order TVD (Total Variation Diminishing) finite difference scheme. The computational results reproduce the measured static pressure distributions in passive and no passive Prandtl-Meyer expansion flows with condensation. From both the experimental and computational results, it is found that the magnitude of steady diabatic shock wave can be considerably reduced by the present passive control method. For no passive control, it is found that the diabatic shock wave due to the heat released by condensation oscillates periodically with a frequency of 2.40 kHz. This unsteady periodic motion of the diabatic shock wave can be completely suppressed using the present passive control method.
ISSN:1738-494X
1226-4865
1976-3824
DOI:10.1007/BF02996106