Large Eddy Simulation Of
Compressible Transitional Cascade Flows
Author(s)
K. Matsuura & C. Kato
Abstract
The large eddy simulation (LES) of compressible transitional flows in a
low-pressure turbine cascade is performed by using 6th-order compact difference
and 10th-order filtering method. The numerical results without free-stream
turbulence and those with about 5% of free-stream turbulence are compared. In
these simulations, separated-flows in the turbine cascade accompanied by
laminar-turbulent transition are realized, and the present results closely agree
with past experimental measurements in terms of the static pressure distribution
around the blade. In the case where no free-stream turbulence is taken into
account, unsteady pressure field essentially differs from that with strong
free-stream turbulence. In the no free-stream turbulence case, pressure waves
that propagate from blade’s wake region have noticeable effects on the
separated-boundary layer near the trailing-edge, and on the neighboring blade.
Also, based on Snapshot Proper Orthogonal Decomposition (POD) analysis,
dominant behaviors of the transitional boundary layers are investigated.
Keywords: large eddy simulation, low pressure turbine, compressible flow,
transition.
1 Introduction
In low-pressure turbines or small-sized turbines, Reynolds number based on the
chord length and the throat exit velocity becomes as small as in the order of 104-
105 due to decrease in density, resulting in increase in kinematic viscosity or the
small length scale. The boundary layer on the blade in such a turbine thus
Keywords
large eddy simulation, low pressure turbine, compressible flow,transition.
Related Book
Other papers in this volume
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