Objective of this paper is to analyze the consequences of borescope blending repairs on the aeroelastic behavior of a modern high pressure compressor (HPC) blisk. To investigate the blending consequences in terms of aerodynamic damping and forcing changes, a generic blending of a rotor blade is modeled. Steady-state flow parameters like total pressure ratio, polytropic efficiency, and the loss coefficient are compared. Furthermore, aerodynamic damping is computed utilizing the aerodynamic influence coefficient (AIC) approach for both geometries. Results are confirmed by single passage flutter (SPF) simulations for specific interblade phase angles (IBPA) of interest. Finally, a unidirectional forced response analysis for the nominal and the blended rotor is conducted to determine the aerodynamic force exciting the blade motion. The frequency content as well as the forcing amplitudes is obtained from Fourier transformation of the forcing signal. As a result of the present analysis, the change of the blade vibration amplitude is computed.

Issue Section:
Research Papers
Topics:
Blades, Compressors, Damping, Flow (Dynamics), Maintenance, Pressure, Steady state, High pressure (Physics), Aerodynamics, Fluid-dynamic forces, Flutter (Aerodynamics), Rotors, Aeroelasticity

References

1.
Jones
,
L. C.
, and
Litzenberg
,
H.
,
2013
, “
A Method of Inspecting and/or Repairing Component and a Device for Inspecting and/or Repairing a Component
,” UK Patent No. 2474834B.
2.
Adair
,
T. L.
,
Owens
,
J. L.
,
Grady
,
G.
,
Winter
,
H. I.
, and
Grant
,
R. C.
,
1998
, “
Blending Borescope Inspection (BBI) Maintenance Service Equates to Cost Savings
,”
AUTOTESTCON IEEE Systems Readiness Technology Conference
, Salt Lake City, UT, Aug. 25–27, pp.
486
–
493
.
3.
Tang
,
W.
,
Epureanu
,
B. I.
, and
Filippi
,
S.
,
2017
, “
Models for Blisks With Large Blends and Small Mistuning
,”
Mech. Syst. Signal Process.
,
87
, pp.
161
–
179
.
Google Scholar
Crossref
Search ADS
 
4.
Chen
,
G.
, and
Hou
,
J.
,
2015
, “
Effects of Mistuning Patterns on Forced Response for an Integrally Bladed Disk
,”
Recent Advances in Structural Integrity Analysis
(Proceedings of the International Congress),
Woodhead Publishing
, Cambridge, UK.
5.
Karger
,
K.
, and
Bestle
,
D.
,
2014
, “
Parametric Blending and FE-Optimisation of a Compressor Blisk Test Case
,”
Advances in Evolutionary and Deterministic Methods for Design, Optimization and Control in Engineering and Sciences
(Computational Methods in Applied Sciences, Vol. 36),
D.
Greiner
,
B.
Galván
,
J.
Périaux
,
N.
Gauger
,
K.
Giannakoglou
, and
G.
Winter
, eds., Springer, Cham, Switzerland.
6.
Sayma
,
A. I.
,
Vahdati
,
M.
,
Sbardella
,
L.
, and
Imregun
,
M.
,
2000
, “
Modeling of Three-Dimensional Viscous Compressible Turbomachinery Flows Using Unstructured Hybrid Grids
,”
AIAA J.
,
38
(
6
), pp.
945
–
954
.
Google Scholar
Crossref
Search ADS
 
7.
Sayma
,
A. I.
,
Vahdati
,
M.
, and
Imregun
,
M.
,
2000
, “
An Integrated Nonlinear Approach for Turbomachinery Forced Response Prediction—Part I: Formulation
,”
J. Fluids Struct.
,
14
(
1
), pp.
87
–
101
.
Google Scholar
Crossref
Search ADS
 
8.
Vahdati
,
M.
,
Sayma
,
A. I.
, and
Imregun
,
M.
,
2000
, “
An Integrated Nonlinear Approach for Turbomachinery Forced Response Prediction—Part II: Case Studies
,”
J. Fluids Struct.
,
14
(
1
), pp.
103
–
125
.
Google Scholar
Crossref
Search ADS
 
9.
Stelldinger
,
M.
,
Giersch
,
T.
,
Figaschewsky
,
F.
, and
Kühhorn
,
A.
,
2016
, “
A Semi-Unstructured Turbomachinery Meshing Library With Focus on Modeling of Specific Geometrical Features
,”
European Congress on Computational Methods in Applied Sciences and Engineering
, Crete Island, Greece, June 5–10, pp.
384
–
401
.https://www.eccomas2016.org/proceedings/pdf/7554.pdf
10.
Crawley
,
E. F.
,
1988
, “
Aeroelastic Formulation for Tuned and Mistuned Rotors
,” Advisory Group for Aerospace Research and Development, Neuilly sur Seine, France, Paper No. 19.
11.
Nipkau
,
J.
,
2011
, “
Analysis of Mistuned Blisk Vibrations Using a Surrogate Lumped Mass Model With Aerodynamic Influences
,” Ph.D. thesis, Brandenburgisch Technische Universität Cottbus, Senftenberg, Germany.
12.
Vahdati
,
M.
,
Sayma
,
A. I.
,
Marshall
,
J. G.
, and
Imregun
,
M.
,
2001
, “
Mechanisms and Prediction Methods for Fan Blade Stall Flutter
,”
J. Propul. Power
,
17
(
5
), pp.
1100
–
1108
.
Google Scholar
Crossref
Search ADS
 
13.
Carta
,
F. O.
,
1967
, “
Coupled Blade-Disk-Shroud Flutter Instabilities in Turbojet Engine Rotors
,”
J. Eng. Power
,
89
(
3
), pp.
419
–
426
.
14.
Hanamura
,
Y.
,
Tanaka
,
H.
, and
Yamaguchi
,
K.
,
1980
, “
A Simplified Method to Measure Unsteady Forces Acting on the Vibrating Blades in Cascade
,”
Bull. JSME
,
23
(
180
), pp.
880
–
887
.
Google Scholar
Crossref
Search ADS
 
15.
Stapelfeldt
,
S.
,
2014
, “
Advanced Methods for Multi-Row Forced Response and Flutter Computations
,”
Ph.D. thesis
, Imperial College London, London.https://spiral.imperial.ac.uk/bitstream/10044/1/24824/1/Stapelfeldt-SC-2014-PhD-Thesis.pdf
16.
Figaschewsky
,
F.
,
Kühhorn
,
A.
,
Beirow
,
B.
,
Giersch
,
T.
,
Nipkau
,
J.
, and
Meinl
,
F.
, “
Simplified Estimation of Aerodynamic Damping for Bladed Rotors—Part 2: Experimental Validation During Operation
,”
ASME
Paper No. GT2016-56458.
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