Bulk flow pulsations in the form of sinusoidal variations of velocity and static pressure at injectant Strouhal numbers from 0.8 to 10.0 are investigated as they affect film cooling from a single row of simple angle holes. Similar flow variations are produced by potential flow interactions and passing shock waves near turbine surfaces in gas turbine engines. Time-averaged temperature distributions, phase-averaged temperature distributions, adiabatic film cooling effectiveness values, and iso-energetic Stanton numbers show that important alterations to film cooling protection occur as pulsation frequency, coolant Strouhal number, blowing ratio, and nondimensional injection hole length are changed. Overall, the pulsations affect film performance and behavior more significantly both as L/D decreases, and as blowing ratio decreases.

1.
Abhari
R. S.
,
1996
, “
Impact of Rotor–Stator Interaction on Turbine Blade Film Cooling
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
118
, pp.
123
133
.
2.
Abhari
R. S.
, and
Epstein
A. H.
,
1994
, “
An Experimental Study of Film Cooling in a Rotating Transonic Turbine
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
116
, pp.
63
70
.
3.
Al-Asmi
K.
, and
Castro
I. P.
,
1993
, “
Production of Oscillatory Flow in Wind Tunnels
,”
Experiments in Fluids
, Vol.
15
, pp.
33
41
.
4.
Bons, J. P., Rivir, R. B., MacArthur, C. D., and Pestian, D. J., 1995, “The Effect of Unsteadiness on Film Cooling Effectiveness,” AIAA Paper No. 95-0306.
5.
Doorly
D. J.
, and
Oldfield
M. L. J.
,
1985
, “
Simulation of the Effects of Shock Wave Passing on a Turbine Rotor Blade
,”
ASME Journal of Engineering for Gas Turbines and Power
, Vol.
107
, pp.
998
1006
.
6.
Gogineni, S. P., Trump, D. D., Rivir, R. B., and Pestian, D. J., 1996, “PIV Measurements of Periodically Forced Flat Plate Film Cooling Flows With High Free Stream Turbulence,” ASME Paper No. 96-GT-236.
7.
Goldstein
R. J.
, and
Yoshida
T.
,
1982
, “
The Influence of a Laminar Boundary Layer and Laminar Injection on Film Cooling Performance
,”
ASME Journal of Heat Transfer
, Vol.
104
, pp.
355
362
.
8.
Karlsson
S. K.
,
1959
, “
An Unsteady Turbulent Boundary Layer
,”
Journal of Fluid Mechanics
, Vol.
14
, pp.
622
636
.
9.
Kline
S. J.
, and
McClintock
F. A.
,
1953
, “
Describing Uncertainties in Single Sample Experiments
,”
Experiments in Fluids
, Vol.
9
, pp.
159
166
.
10.
Krause
E.
, and
Schweitzer
W. B.
,
1990
, “
The Effect of an Oscillatory Freestream-Flow on a NACA-4412 Profile at Large Relative Amplitudes and Low Reynolds Numbers
,”
Experiments in Fluids
, Vol.
9
, pp.
159
166
.
11.
Ligrani
P. M.
,
Gong
R.
,
Cuthrell
J. M.
, and
Lee
J. S.
,
1996
a, “
Bulk Flow Pulsations and Film Cooling: Part 1, Injectant Behavior
,”
Int. J. Heat Mass Transfer
, Vol.
39
, pp.
2271
2282
.
12.
Ligrani
P. M.
,
Gong
R.
,
Cuthrell
J. M.
, and
Lee
J. S.
,
1996
b, “
Bulk Flow Pulsations and Film Cooling: Part 2, Flow Structure and Film Effectiveness
,”
Int. J. Heat Mass Transfer
, Vol.
39
, pp.
2283
2292
.
13.
Ligrani
P. M.
,
Gong
R.
, and
Cuthrell
J. M.
,
1997
a, “
Bulk Flow Pulsations and Film Cooling: Flow Structure Just Downstream of the Holes
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
119
, pp.
568
573
.
14.
Ligrani
P. M.
,
Gong
R.
,
Cuthrell
J. M.
, and
Lee
J. S.
,
1997
b, “
Effects of Bulk Flow Pulsations on Film-Cooled Boundary Layer Structure
,”
ASME Journal of Fluids Engineering
, Vol.
119
, pp.
56
66
.
15.
Ligrani
P. M.
,
Wigle
J. M.
,
Ciriello
S.
, and
Jackson
S. W.
,
1994
, “
Film-Cooling From Holes With Compound Angle Orientations: Part 1—Results Downstream of Two Staggered Rows of Holes With 3D Spanwise Spacing
,”
ASME Journal of Heat Transfer
, Vol.
116
, pp.
341
352
.
16.
Ligrani
P. M.
, and
Williams
W. W.
,
1990
, “
Effects of an Embedded Vortex on Injectant From a Single Film-Cooling Hole in a Turbulent Boundary Layer
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
112
, pp.
428
436
.
17.
Miller
J. A.
, and
Pucci
P. F.
,
1971
, “
Heat Transfer to an Airfoil in Oscillating Flow
,”
ASME Journal of Engineering for Power
, Vol.
93
, pp.
461
468
.
18.
Pedersen
D. R.
,
Eckert
E. R. G.
, and
Goldstein
R. J.
,
1977
, “
Film Cooling With Large Density Differences Between the Mainstream and the Secondary Fluid Measured by the Heat-Mass Transfer Analogy
,”
ASME Journal of Heat Transfer
, Vol.
99
, pp.
620
627
.
This content is only available via PDF.
You do not currently have access to this content.