In the present paper, unsteady viscous flow analysis around turbine blade cascade using a high-order LES turbulence model is carried out to investigate the basic physical process involved in the pressure loss mechanism. This numerical analysis is assessed to the wind tunnel cascade test. Basically, all the physical phenomena occurring in nature are the effect of some cause, and the effect can somehow be measured. However, to understand the cause, detail information regarding the visualization of the phenomena, which are difficult to measure, are necessary. Therefore, in the present paper, firstly the computed results are compared with the measured data, which are the final outcome of the cause (of the phenomena under investigation), to verify whether our physics-based model could qualitatively predict the measured facts or not. It was found that the present model could well predict measured data. Therefore, the rest of the computed information, which were difficult to measure, were used to visualize the overall flow behavior for acquiring some knowledge of the physical process associated with the pressure loss mechanism. The present study led to an understanding that the interaction of the vortex generated on the suction and pressure surface of the blade and the secondary vortex generated on the end wall, downstream of the trailing edge, resulted in the formation of a large vortex structure in this region. This unsteady three-dimensional flow characteristic is expected to play an important role in the pressure loss mechanism.

References

1.
Chima
,
R. V.
, 1985, “
Inviscid and Viscous Flows in Cascades With an Explicit Multiple-Grid Algorithm
,”
AIAA J.
,
23
(
10
), pp.
1556
1563
.
2.
Chima
,
R. V.
, 1987, “
Explicit Multiple-Grid Algorithm for Quasi-Three-Dimensional Viscous Flows in Turbo-machinery
,”
J. Propul. Power
,
3
(
5
), pp.
397
405
.
3.
Dawes
,
W. N.
, 1987, “
A Numerical Analysis of the Three-Dimensional Viscous Flow in a Transonic Compressor Rotor and Comparison With Experiment
,”
ASME J. Turbomach.
,
109
(
1
), pp.
83
90
.
4.
Davis
,
R. L.
,
Ni
,
R. H.
and
Carter
,
J. E.
, 1987, “
Cascade Viscous Flow Analysis Using the Navier-Stokes Equations
,”
J. Propul. Power
,
3
(
5
), pp.
406
414
.
5.
Weber
,
K. F.
,
Thoe
,
D. W.
, and
Delaney
,
R. A.
, 1990, “
Analysis of Three-Dimensional Turbomachinery Flows on C-Type Grids Using an Implicit Euler Solver
,”
ASME J. Turbomach.
,
12
, pp.
362
369
.
6.
Yamamoto
,
Y.
,
Daiguji
,
H.
, and
Ishigaki
,
H.
, 1988, “
An Implicit Time-Marching Scheme for Solving the Compressible Navier-Stokes Equations
,”
Computational Fluid Dynamics
,
G. D. V.
Davis
and
C.
Fletcher
, eds.,
Elsevier
,
New York
.
7.
Weinberg
,
B. C.
,
Yang
,
R. J.
,
Mcdonald
,
H.
, and
Shamroth
,
S. J.
, 1986, “
Calculation of Two- and Three-Dimensional Transonic Cascade Flow Fields Using the Navier-Stokes Equations
,”
ASME J. Eng. Gas Turbines Power
,
108
, pp.
93
102
.
8.
Hah
,
C.
, 1989, “
Numerical Study of Three-Dimensional Flow and Heat Transfer Near the Endwall of Turbine Blade Row
,” AIAA Paper No. 89–1689.
9.
Mittal
,
R.
,
Venkatasubramanian
,
S.
, and
Najjar
,
F. M.
, 2001, “
Large Eddy Simulation of Flow Through a Low Pressure Turbine Cascade
, AIAA Paper No. 2001–2560.
10.
Postl
,
D.
,
Gross
,
A.
, and
Fasel
,
H. F.
, 2003, “
Numerical Investigation of Low Pressure Turbine Blade Separation Control
,” AIAA Paper No. 2003–0614.
11.
Wissink
,
J. G.
, 2003, “
DNS of Separating, Low-Reynolds Number Flow in a Turbine Cascade With Incoming Wakes
,”
Int. J. Heat Fluid Flow
,
24
(
4
), pp.
626
635
.
12.
Biswas
,
D.
, 2006, “
Studies on Separation Control CFD Validation Test Case Based on High Order LES Model
,” AIAA Paper No. 2006–2881.
13.
Biswas
,
D.
, 2006, “
Studies on Unsteady Laminar-Turbulent Transition in a Low Pressure Turbine Flow Based on a High Order LES Model
,” AIAA Paper No. 2006–3684.
14.
Otomo
,
F.
, and
Matsuda
,
H.
, 2007, “
Cascade Test
,” private communication.
15.
Shu
,
C.-W.
, 1997, “
Essentially Non-Oscillatory and Weighted Essentially Non-Oscillatory Schemes for Hyperbolic Conservation Laws
,” ICASE Report No. 97–65.
16.
Germono
,
M.
,
Piomelli
,
U.
,
Moin
,
P.
, and
Cabot
,
W. H.
, 1991, “
A Dynamic Subgrid-Scale Eddy Viscosity Model
,”
Phys. Fluids
,
A3
(
7
), pp.
1760
1765
.
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