The subject of this paper is the investigation of unsteady flow inside a transonic centrifugal compressor stage with a pipe-diffuser by utilizing unsteady 3D Reynolds-averaged Navier–Stokes simulations (unsteady 3D URANS). The computational fluid dynamics (CFD) results obtained are compared with detailed experimental data gathered using various steady and unsteady measurement techniques. The basic phenomena and mechanisms of the complex and highly unsteady flow inside the compressor with a pipe-diffuser are presented and analyzed in detail.

References

References
1.
Kenny
,
D.
,
1969
, “
A Novel Low-Cost Diffuser for High-Performance Centrifugal Compressors
,”
ASME J. Eng. Power
,
91
(
1
), pp.
37
46
.10.1115/1.3574671
2.
Kenny
,
D.
,
1970
, “
Supersonic Radial Diffusers
,”
Advanced Compressors (AGARD Lecture Series, Vol. 39)
,
VKI
,
Brussels, Belgium
.
3.
Rundstadler
,
P.
, and
Dean
,
R.
,
1963
, “
Straight Channel Diffuser Performance at High Inlet Mach Numbers
,” ASME Paper No. 63-WA/FE-19.
4.
Bennet
,
I.
,
Tourlidakis
,
A.
, and
Elder
,
R. L.
,
1998
, “
Detailed Measurements Within a Selection of Pipe Diffusers for Centrifugal Compressors
,” ASME Paper No. 98-GT-92.
5.
Zachau
,
U.
,
2008
, “
Experimental Investigation on the Diffuser Flow of a Centrifugal Compressor Stage With Pipe Diffuser
,” Ph.D. thesis, RWTH Aachen University, Aachen, Germany.
6.
Zachau
,
U.
,
Buescher
,
C.
,
Niehuis
,
R.
,
Hoenen
,
H.
,
Wisler
,
D. C.
, and
Moussa
,
Z. M.
,
2008
, “
Experimental Investigation of a Centrifugal Compressor Stage With Focus on the Flow in the Pipe Diffuser Supported by Particle Image Velocimetry (PIV) Measurements
,”
ASME
Paper No. GT2008-51538. 10.1115/GT2008-51538
7.
Kunte
,
R.
,
Schwarz
,
P.
,
Wilkosz
,
B.
,
Jeschke
,
P.
, and
Smythe
,
C.
,
2013
, “
Experimental and Numerical Investigations of the Tip Clearance and Bleed Effects in a Centrifugal Compressor Stage With Pipe Diffuser
,”
ASME J. Turbomach.
,
135
(
1
), p.
011005
.10.1115/1.4006318
8.
Volmar
,
T.
,
Brouillet
,
B.
,
Gallus
,
H. E.
, and
Benetschik
,
H.
,
1998
, “
Time Accurate 3D Navier–Stokes Analysis of a 1-1/2 Stage Axial Flow Turbine
,”
AIAA
Paper No. 98-3247. 10.2514/6.1998-3247
9.
Chien
,
K. Y.
,
1982
, “
Prediction of Channel and Boundary-Layer Flows With a Low-Reynolds-Number-Turbulence Model
,”
AIAA J.
,
20
(
1
), pp.
33
38
.10.2514/3.51043
10.
Erdos
,
J. I.
,
Alzner
,
E.
, and
McNally
,
W.
,
1977
, “
Numerical Solution of Periodic Transonic Flow Through a Fan Stage
,”
AIAA J.
,
1
(
11
), pp.
1559
1568
.10.2514/3.60823
11.
Grates
,
D. R.
,
2010
, “
Numerische Simulation der instationären Strömung in einem Radialverdichter mit Pipe-Diffusor
,” Ph.D. thesis, RWTH Aachen University, Aachen, Germany (in German).
12.
Inoue
,
M.
, and
Cumpsty
,
N. A.
,
1984
, “
Experimental Study of Centrifugal Impeller Discharge Flow in Vaneless and Vaned Diffusers
,”
ASME J. Eng. Gas Turbines Power
,
106
, pp.
455
467
.10.1115/1.3239588
13.
Ziegler
,
K. U.
,
Gallus
,
H. E.
, and
Niehuis
,
R.
,
2003
, “
A Study on Impeller-Diffuser Interaction—Part I: Influence on the Performance
,”
ASME J. Turbomach.
,
125
(
1
), pp.
173
182
.10.1115/1.1516814
14.
Ziegler
,
K. U.
,
Gallus
,
H. E.
, and
Niehuis
,
R.
,
2003
, “
A Study on Impeller-Diffuser Interaction—Part II; Detailed Flow Analysis
,”
ASME J. Turbomach.
,
125
(
1
), pp.
183
192
. 10.1115/1.1516815
15.
Traupel
,
W.
,
1988
,
Thermische Turbomaschinen
, Vol.
1
,
Springer-Verlag
,
Berlin
.
16.
Stahlecker
,
D.
,
Casartelli
,
E.
, and
Gyarmathy
,
G.
,
1998
, “
Secondary Flow Field Measurements With a LDV in the Vaned Diffuser of a High-Subsonic Centrifugal Compressor
,”
9th International Symposium on Application of Laser Techniques to Fluid Mechanics
,
Lisbon, Portugal
, July 13–16.
17.
Domercq
,
O.
, and
Thomas
,
R.
,
1998
, “
Unsteady Flow Investigation in a Transonic Centrifugal Compressor Stage
,”
AIAA
Paper No. 98-2877. 10.2514/6.1997-2877
You do not currently have access to this content.