A unique methodology and test rig was designed to evaluate the degradation of damaged nozzle guide vanes (NGVs) in a transonic annular cascade in the short duration facility at the Royal Military College. A custom test section was designed which featured a novel rotating instrumentation suite. This permitted 360 deg multispan traverse measurements downstream from unmodified turbine NGV rings from a Rolls-Royce/Allison A-250 turbo-shaft engine. The downstream total pressure was measured at four spanwise locations on both an undamaged reference and a damaged test article. Three performance metrics were developed in an effort to determine characteristic signatures for common operational damage such as trailing edge bends or cracked trailing edges. The highest average losses were observed in the root area, while the lowest occurred closer to the NGV tips. The results from this study indicated that multiple spanwise traverses were required to detect localized trailing edge damage. Recommendations are made for future testing and to further develop performance metrics.

References

References
1.
Ilott
,
J.
,
Asghar
,
A.
,
Allan
,
W. D. E.
, and
Woodason
,
R.
,
2011
, “
Further Investigation of the Influence of Real-World Blades Profile Variation on the Aerodynamic Performance of Transonic Nozzle Guide Vanes
,”
ASME
Paper No. GT2011-46558.10.1115/GT2011-46558
2.
Woodason
,
R.
,
2009
, “
An Experimental Investigation of the Influence of Service Exposure on the Aerodynamic Performance of Transonic Turbine Vanes
,” MA.Sc. thesis, Royal Military College, Kingston, Canada.
3.
Wang
,
S. S.
,
Mao
,
J. R.
,
Liu
,
G. W.
, and
Feng
,
Z. P.
,
2009
, “
Performance Deterioration of the Governing Stage Nozzle Caused by Solid Particle Erosion in the Steam Turbine
,”
J. Power Energy
,
224
(2), pp.
279
292
.10.1243/09576509JPE852
4.
Islam
,
M. T.
,
1999
, “
An Experimental and Computational Study of the Aerodynamics of Turbine Blades With Damage
,” Ph.D. dissertation, Carleton University, Ottawa, Canada.
5.
Denton
,
J. D.
,
1993
, “
Loss Mechanisms in Turbomachines
,”
ASME J. Turbomach.
,
115
(4), pp.
621
655
.10.1115/1.2929299
6.
Sjolander
,
S.
,
Isaacs
,
D.
, and
Klein
,
W.
,
1993
, “
Aerodynamics of Turbine Blades With Trailing-Edge Damage: Measurements and Computations
,”
XI International Symposium on Air Breathing Engines
, Tokyo, Japan, September 20–24, pp.
1327
1334
.
7.
Jouini
,
D. B. M.
,
Sjolander
,
S. A.
, and
Moustapha
,
S. H.
,
2001
, “
Aerodynamic Performance of a Transonic Turbine Cascade at Off-Design Conditions
,”
ASME J. Turbomach.
,
123
(3), pp.
510
518
.10.1115/1.1370157
8.
Chu
,
T. L.
,
1999
, “
Effects of Mach Number and Flow Incidence on Aero Losses of Steam Turbine Blades
.” Master's thesis, Virginia Polytechnic Institute and State University, Blacksburg, VA.
9.
Lorenz
,
M.
,
Schulz
,
A.
, and
Bauer
,
H. J.
,
2012
, “
Experimental Study of Surface Roughness Effects on a Turbine Airfoil in a Linear Cascade—Part II: Aerodynamic Losses
,”
ASME J. Turbomach
,
134
(4), p. 041007.10.1115/1.4003656
10.
Boelcs
,
A.
and
Sari
,
O.
,
1988
, “
Influence of Deposit on the Flow in a Turbine Cascade
,”
ASME J. Turbomach.
,
110
(4), pp.
512
519
.10.1115/1.3262225
11.
DeCecco
,
S. F.
,
1995
, “
The Aerodynamics of Turbine Blades With Tip Damage
,” Master's thesis, Carleton University, Ottawa, Canada.
12.
Hodson
,
H. P.
and
Dominy
,
R. G.
,
1993
, “
Annular Cascade Testing
,” NATO Research and Technology Organization, Technical Report No. AGARD-AG-328.
13.
Povey
,
T.
,
Chana
,
K. S.
, and
Jones
,
T. V.
,
2003
, “
Heat Transfer Measurements on an Intermediate-Pressure Nozzle Guide Vane Tested in a Rotating Annular Turbine Facility, and the Modifying Effects of a Non-Uniform Inlet Temperature Probe
,”
J. Power Energy
,
217
(4), pp.
421
431
.10.1243/095765003322315487
14.
Day
,
C. R. B.
,
Oldfield
,
M. L. G.
, and
Lock
,
G. D.
,
2000
, “
Aerodynamic Performance of an Annular Cascade of Film Cooled Nozzle Guide Vanes Under Engine Representative Conditions
,”
Exp. Fluids
,
29
(2), pp.
117
129
.10.1007/s003489900062
15.
Woodason
,
R.
,
Asghar
,
A.
, and
Allan
,
W. D. E.
,
2009
, “
Assessment of the Flow Quality of a Transonic Turbine Cascade
,”
ASME
Paper No. GT2009-60164.10.1115/GT2009-60164
16.
Edwards
,
R.
,
Asghar
,
A.
,
Woodason
,
R.
,
LaViolette
,
M.
,
Goni Boulama
,
K.
, and
Allan
,
W. D. E.
,
2012
, “
Numerical Investigation of the Influence of Real World Blade Profile Variations on the Aerodynamic Performance of Transonic Nozzle Guide Vanes
,”
ASME J. Turbomach.
,
134
(2), p. 021014.10.1115/1.4003050
17.
Bouchard
,
D.
,
Asghar
,
A.
,
Edwards
,
R.
,
Hardes
,
J.
,
Allan
,
W.
, and
Woodason
,
R.
,
2012
, “
Influence of a Novel Three-Dimensional Leading Edge Geometry on the Aerodynamic Performance of Transonic Cascade Vanes
,”
ASME
Paper No. GT2012-66926.10.1115/GT2012-66926
18.
Gracey
,
W.
,
1956
, “
Wind-Tunnel Investigation of a Number of Total-Pressure Tubes at High Angles of Attack: Subsonic, Transonic, and Supersonic Speeds
,” NACA, Technical Report No. 1303.
19.
Issacs
,
D. P.
,
1994
, “
The Aerodynamics of Turbine Blades With Trailing Edge Damage
,” Master's thesis, Carleton University, Ottawa, Canada.
20.
Figliola
,
R. S.
and
Beasley
,
D. E.
,
2000
,
Theory and Design for Mechanical Measurements
,
3rd ed.
,
John Wiley and Sons
,
New York
, pp.
369
372
.
21.
Bouchard
,
D.
,
2012
, “
Experimental Evaluation of Service-Exposed Nozzle Guide Vane Damage in a Rolls Royce A-250 Gas Turbine
,” MA.Sc. thesis, Royal Military College, Kingston, Canada.
22.
Lakshiminarayana
,
B.
,
1996
,
Fluid Dynamics and Heat Transfer of Turbomachinery
,
John Wiley and Sons
,
New York
.
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