Application of nonaxisymmetric casing treatments (CTs) can extend the operating range of a transonic compressor significantly. Recent CT designs have proven successful at achieving operating range extension without efficiency loss under design conditions. Two different CT designs were investigated on a high-speed one and a half stage test rig using extensive instrumentation. The stage setup is representative of the front stage of a modern high-pressure compressor. Results of particle image velocimetry (PIV) measurements taken in the blade tip region underneath the CT show a significantly modified flow structure compared to the smooth casing reference case. Blockage zone, secondary flow, and shock structures are affected by the CT, especially in highly throttled operating conditions. The stall inception process of the system with axial slots shows unexpected behavior, with modal activities that are not observed without CT. These activities are resolved using unsteady wall pressure (WP) and hot wire measurements.

References

References
1.
Schlechtriem
,
S.
, and
Lötzerich
,
M.
,
1997
, “
Breakdown of Tip Leakage Vortices in Compressors at Flow Conditions Close to Stall
,”
ASME
Paper No. GT-1997-41.
2.
Seitz
,
P.
,
1999
, “
Casing Treatment for Axial Flow Compressors
,” Ph.D. thesis, University of Cambridge, Cambridge, UK.
3.
Streit
,
J. A.
,
2014
, “
Zum Fortschritt Transsonischer Axialverdichter
,” Ph.D. thesis, Technische Universität München, Lehrstuhl für Flugantriebe, München, Germany.
4.
Yu
,
Q.
,
Li
,
Q.
, and
Li
,
L.
,
2002
, “
The Experimental Researches on Improving Operating Stability of a Single-Stage Transonic Fan
,”
ASME
Paper No. GT-2002-30640.
5.
Danner
,
F.
,
Kau
,
H.-P.
,
Müller
,
M.
,
Schiffer
,
H.-P.
, and
Brignole
,
G.
,
2009
, “
Experimental and Numerical Analysis of Axial Skewed Slot Casing Treatments for a Transonic Compressor Stage
,”
ASME
Paper No. GT-2009-59647.
6.
Legras
,
G.
,
Castillon
,
L.
,
Trebinjac
,
I.
, and
Gourdain
,
N.
,
2011
, “
Flow Mechanisms Induced by Non-Axisymmetric Casing Treatment in a Transonic Axial Compressor
,”
10th International Symposium on Experimental Computational Aerothermodynamics of Internal Flows
,
Brussels
, July 4–7, Paper No. ISAIF10-158.
7.
Tuo
,
W.
,
Lu
,
Y.
,
Yuan
,
W.
,
Zhou
,
S.
, and
Li
,
Q.
,
2010
, “
Experimental Investigation on the Effects of Unsteady Excitation Frequency of Casing Treatment on Transonic Compressor Performance
,”
ASME J. Turbomach.
,
133
(
2
), p.
021014
.
8.
Kroeckel
,
T.
,
Jeschke
,
P.
, and
Hiller
,
S.
,
2011
, “
Application of a Multistage Casing Treatment in a High Speed Axial Compressor Test Rig
,”
ASME
Paper No. GT-2011-46315.
9.
Hathaway
,
M.
,
2002
, “
Self-Recirculating Casing Treatment Concept for Enhanced Compressor Performance
,”
ASME
Paper No. 2002-GT-30368.
10.
Suder
,
K. L.
,
Hathaway
,
M.
,
Thorp
,
S.
,
Strazisar
,
A.
, and
Bright
,
M.
,
2000
, “
Compressor Stability Enhancement using discrete Tip Injection
,”
ASME
Paper No. GT-2000-650.
11.
Matzgeller
,
R.
,
Voges
,
M.
, and
Schroll
,
M.
,
2011
, “
Investigation of Unsteady Compressor Flow Sturcture With Tip Injection Using Particle Image Velocimetry
,”
ASME
Paper No. GT-2011-45281.
12.
Voges
,
M.
,
Willert
,
C.
,
Schnell
,
R.
,
Müller
,
M.
, and
Zscherp
,
C.
,
2008
, “
PIV Application for Investigation of the Rotor Blade Tip Interaction With a Casing Treatment in a Transonic Compressor Stage
,”
14th International Symposium on Applications of Laser Techniques to Fluid Mechanics
,
Lisbon
, Paper No. 1060.
13.
Wilke
,
I.
, and
Kau
,
H.-P.
,
2002
, “
A Numerical Investigation of the Influence of Casing Treatments on the Tip Leakage Flow in a HPC Front Stage
,”
ASME
Paper No. GT-2002-30642.
14.
Hembera
,
M.
,
Kau
,
H.-P.
, and
Johann
,
E.
,
2008
, “
Simulation of Casing Treatments of a Transonic Compressor Stage
,”
Int. J. Rotating Mach.
,
2008
, p.
657202
.
15.
Streit
,
J.
,
Brandstetter
,
C.
,
Heinichen
,
F.
, and
Kau
,
H.-P.
,
2013
, “
An Advanced Axial-Slot Casing Treatment on a Tip-Critical Transonic Compressor Rotor—Part 2: Taking a Closer Look With CFD
,”
European Turbomachinery Conference 10
,
Lappeenranta, Finland
, Paper No. A071.
16.
Brandstetter
,
C.
,
Kegalj
,
M.
,
Wartzek
,
F.
,
Heinichen
,
F.
, and
Schiffer
,
H.-P.
,
2013
, “
An Advanced Axial-Slot Casing Treatment on a Tip-Critical Transonic Compressor Rotor—Part 1: Unsteady Wall Pressure and Hot Wire Measurements
,”
European Turbomachinery Conference 10
,
Lappeenranta, Finland
, Paper No. A070.
17.
Brandstetter
,
C.
,
Kegalj
,
M.
,
Biela
,
C.
, and
Schiffer
,
H.-P.
,
2011
, “
PIV-Measurements in a Transonic Compressor Test Rig With Variable Inlet Guide Vanes
,”
International Symposium of Air Breathing Engines
,
Gothenburg, Sweden
.
18.
Brandstetter
,
C.
,
Kegalj
,
M.
,
Wartzek
,
F.
,
Heinichen
,
F.
, and
Schiffer
,
H.-P.
,
2014
, “
Stereo PIV Measurement of Flow Structures Underneath an Axial-Slot Casing Treatment on a One and a Half Stage Transonic Compressor
,”
17th International Symposium on Applications of Laser Techniques to Fluid Mechanics
,
Lisbon
, Paper No. 02.4.1.91.
19.
Biela
,
C.
,
Brandstetter
,
C.
,
Schiffer
,
H.-P.
, and
Heinichen
,
F.
,
2013
, “
Unsteady Wall Pressure Measurement in a One-and-a-Half Stage Axial Transonic Compressor During Stall Inception
,”
Proc. Inst. Mech. Eng., Part A
,
227
(
6
), pp.
646
653
.
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