Abstract

In centrifugal compressors, it is common to observe a rapid reduction in surge margin toward high rotational speed, which shows a non-linear surge characteristic against the change of rotational speed. This paper presents a comprehensive experimental and numerical study to understand the flow mechanisms leading to the non-linear surge behavior in a high-speed centrifugal compressor. It shows that for the studied compressor, there are two critical flow coefficients (ϕ = 0.255 and 0.136) where the stability of the compressor stage is significantly weakened. At a higher speed, the impeller rotating stall happens at the first critical point where the diffuser instability is also enhanced. This is caused by the increase of the flow non-uniformity at the impeller exit as well as increased diffuser inflow angle due to the impeller compressibility effect. Therefore, both the impeller and diffuser’s instability are matched and trigger the surge at a high flow coefficient. In contrast, at a lower speed, the diffuser instability is not enhanced by the impeller rotating stall, this mismatch of the two component’s instability allows the compressor to pass through the first critical point and extend the surge limit to the second critical point where the diffuser reaches the stability limit and causes the rotating stall spontaneously. By these different behaviors at each speed, the non-linearity of the surge characteristic is established.

References

1.
Greitzer
,
E. M.
,
1976
, “
Surge and Rotating Stall in Axial Flow Compressors
,”
J. Eng. Power
,
98
(
2
), pp.
190
217
.
2.
Fink
,
D. A.
,
Cumpsty
,
N. A.
, and
Greitzer
,
E. M.
,
1992
, “
Surge Dynamics in a Free-Spool Centrifugal Compressor System
,”
ASME J. Turbomach.
,
114
(
2
), pp.
321
332
.
3.
Tomita
,
I.
,
An
,
B.
, and
Nanbu
,
T.
,
2014
, “
A New Operating Range Enhancement Device Combined With a Casing Treatment and Inlet Guide Vanes for Centrifugal Compressors
,”
11th International Conference on Turbochargers and Turbocharging
,
London
,
May 11–12
, pp.
79
87
.
4.
Dielenschneider
,
T.
,
Ratz
,
J.
,
Leichtfuß
,
S.
,
Schiffer
,
H.
, and
Eißler
,
W.
,
2021
, “
On the Challenge of Determining the Surge Limit of Turbocharger Compressors: Part 1—Experimental and Numerical Analysis of the Operating Limits
,”
Proceedings of the ASME Turbo Expo 2021
,
Virtual online
,
June 7–11
,
p. V006T19A011, 1–13
.
5.
Zheng
,
X.
, and
Liu
,
A.
,
2015
, “
Phenomenon and Mechanism of Two-Regime-Surge in a Centrifugal Compressor
,”
ASME J. Turbomach.
,
137
(
8
), p.
081007
.
6.
Dehner
,
R.
,
Selamet
,
A.
,
Keller
,
P.
, and
Becker
,
M.
,
2016
, “
Simulation of Deep Surge in a Turbocharger Compression System
,”
ASME J. Turbomach.
,
138
(
11
), p.
111002
.
7.
Yoshinaka
,
T.
,
1977
, “
Surge Responsibility and Range Characteristics of Centrifugal Compressors
,”
1977 Tokyo Joint Gas Turbine Congress
,
Tokyo, Japan
,
May 22–27
, p.
381
.
8.
Lenneman
,
E.
, and
Howard
,
J. H. G.
,
1970
, “
Unsteady Flow Phenomena in Rotating Centrifugal Impeller Passages
,”
J. Eng. Power
,
92
(
2
), pp.
65
72
.
9.
Frigne
,
P.
, and
Braembussche
,
V. D.
,
1984
, “
Distinction Between Different Types of Impeller and Diffuser Rotating Stall in a Centrifugal Compressor With Vaneless Diffuser
,”
ASME J. Eng. Gas Turbines Power
,
106
(
2
), pp.
468
474
.
10.
Yamada
,
K.
,
Furukawa
,
M.
,
Fukushima
,
H.
,
Ibaraki
,
S.
, and
Tomita
,
I.
,
2011
, “
The Role of Tip Leakage Vortex Breakdown in Flow Fields and Aerodynamic Characteristics of Transonic Centrifugal Compressor Impellers
,”
Proceedings of the ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. Volume 7: Turbomachinery, Parts A, B, and C
,
Vancouver, British Columbia, Canada
,
June 6–10
, pp.
2111
2123
.
11.
Jansen
,
W.
,
1964
, “
Rotating Stall in a Radial Vaneless Diffuser
,”
J. Basic Eng.
,
86
(
4
), pp.
750
758
.
12.
Senoo
,
Y.
, and
Kinoshita
,
Y.
,
1977
, “
Influence of Inlet Flow Condition and Geometries of Centrifugal Vaneless Diffuser on Critical Flow Angles for Reverse Flow
,”
ASME J. Fluid. Eng.
,
99
(
1
), pp.
98
103
.
13.
Spakovszky
,
Z. S.
,
2004
, “
Backward Traveling Rotating Stall Waves in Centrifugal Compressors
,”
ASME J. Turbomach.
,
126
(
1
), pp.
1
12
.
14.
Dean
,
R. C.
,
1974
,
The Fluid Dynamic Design of Advanced Centrifugal Compressors, Lecture Notes
,
Von Karman Institute
,
Brussels
, pp.
68
69
.
15.
Japikse
,
D.
,
1986
, “
A Critical Evaluation of Three Centrifugal Compressors With Pedigree Data Sets: Part 5—Studies in Component Performance
,”
Proceedings of the ASME 1986 International Gas Turbine Conference and Exhibit
,
Dusseldorf, West Germany
,
June 8–12
, p.
V001T01A082
.
16.
Cumpsty
,
N. A.
,
1989
, “Stall and Surge,”
Compressor Aerodynamics
,
Longman Scientific & Technical, John Wiley & Sons
,
Essex, New York
, pp.
376
377
.
17.
Casey
,
M.
, and
Robinson
,
C.
,
2021
,
Radial Flow Turbocompressors
,
Cambridge University Press
,
Cambridge
, pp.
582
583
.
18.
Galindo
,
J.
,
Serrano
,
J. R.
,
Cuardiola
,
C.
, and
Cervello
,
C.
,
2006
, “
Surge Limit Definition in a Specific Test Bench for the Characterization of Automotive Turbochargers
,”
Exp. Therm. Fluid. Sci.
,
30
(
5
), pp.
449
462
.
19.
Brandvik
,
T.
, and
Pullan
,
G.
,
2011
, “
An Accelerated 3D Navier-Stokes Solver for Flows in Turbomachines
,”
ASME J. Turbomach.
,
133
(
2
), p.
02105
.
20.
Cao
,
T.
,
Kanzaka
,
T.
,
Xu
,
L.
, and
Brandvik
,
T.
,
2021
, “
Tip Leakage Flow Instability in a Centrifugal Compressor
,”
ASME J. Eng. Gas Turbines Power
,
143
(
4
), p.
041012
.
21.
Senoo
,
Y.
, and
Kinoshita
,
Y.
,
1978
, “
Limits of Rotating Stall and Stall in Vaneless Diffuser of Centrifugal Compressors
,”
ASME Turbo Expo 1978
, ASME Paper No. 78 GT 19.
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