Centrifugal compressors used for turbochargers need to achieve a wide operating range. The author has developed a high pressure ratio centrifugal compressor with pressure ratio 5.7 for a marine use turbocharger. In order to enhance operating range, two different types of recirculation devices were applied. One is a conventional recirculation device. The other is a new one. The conventional recirculation device consists of an upstream slot, bleed slot and the annular cavity which connects both slots. The new recirculation device has vanes installed in the cavity. These vanes were designed to provide recirculation flow with negative preswirl at the impeller inlet, a swirl counterwise to the impeller rotational direction. The benefits of the application of both of the recirculation devices were ensured. The new device in particular, shifted surge line to a lower flow rate compared to the conventional device.

References

References
1.
Codan
,
E.
, and
Mathey
,
C.
, 2007, “
Emissions − A New Challenge for Turbochargers
,” CIMAC Congress, Vienna, Paper No. 245.
2.
Ibaraki
,
S.
,
Furukawa
,
M.
,
Iwakiri
,
K.
, and
Takahashi
,
K.
, 2007, “
Vortical Flow Structure and Loss Generation Process in a Transonic Centrifugal Compressor Impeller
,” ASME Paper No. GT2007-27791.
3.
Iwakiri
,
K.
,
Furukawa
,
M.
, and
Suzuki
,
R.
, 2007, “
Analysis of Vortical Flow Field in a Centrifugal Compressor Impeller with Vaneless Diffuser
,”
The 9th Asian International Conference on Fluid Machinery
, Paper No. AICFM9-092.
4.
Guo
,
G.
,
Zhang
,
Y.
,
Xu
,
J.
,
Zheng
,
X.
, and
Zhuge
,
W.
, 2008, “
Numerical Simulation of a Transonic Centrifugal Compressor Blade Tip Clearance Flow of Vehicle Turbocharger
,” ASME Paper No. GT2008-50957.
5.
Higashimori
,
H.
,
Hasegawa
,
K.
, and
Sumida
,
K.
, 2004, “
Detailed Flow Study of Mach number 1.6 High Transonic Flow with a Shock Wave in a Pressure Ratio 11 Centrifugal Compressor Impeller
,” ASME Paper No. GT2004-53435.
6.
Marconcini
,
M.
,
Rubechini
,
F.
, and
Arnone
,
A.
, 2006, “
Numerical Investigation of a Transonic Centrifugal Compressor
,” ASME Paper No. GT2006-90098.
7.
Ibaraki
,
S.
,
Sumida
,
K.
, and
Suita
,
T.
, 2009, “
Design and Off-Design Flow Fields of a Transonic Centrifugal Impeller
,” Paper No. GT2009-59986.
8.
Hazby
,
R. H.
, and
Xu
,
L.
, “
Role of Tip Leakage in Stall of a Transonic Centrifugal Impeller
,” ASME Paper No. GT2009-59372.
9.
Hunziker
,
R.
,
Dickmann
H.-P.
, and
Emmrich
,
R.
, 2001, “
Numerical and Experimental Investigation of a Centrifugal Compressor with an Inducer Casing Bleed System
,”
Proceedings of Institution of Mechanical Engineers
, Vol.
215
, Part A.
10.
Sivagnanasundaram
,
S.
,
Spence
,
S.
,
Early
,
J.
, and
Nikpour
,
B.
, 2010, “
An Investigation of Compressor Map Width Enhancement and the Inducer Flow Field Using Various Configurations of Shroud Bleed Slot
,” ASME Paper No. GT2010-22154.
11.
Fisher
,
F. B.
, 1988, “
Application of Map Width Enhancement Devices to Turbocharger Compressors Stages
,” SAE Paper No. 880794.
12.
Yamaguchi
,
S.
,
Yamaguchi
,
H.
,
Goto
,
S.
,
Nakao
,
H
, and
Nakamura
,
F.
, 2002, “
The Development of Effective Casing Treatment for Turbocharger Compressors
,” IMechE Paper No. C602/008/2002.
13.
Yin
,
J.
,
Li
,
P.
, and
Pees
,
S.
, 2009, “
Optimization of Turbocharger Ported Shroud Compressor Stages
,” ASME Paper No. GT2009-59248.
14.
Tamaki
,
H.
,
Unno
,
M.
,
Kawakubo
,
T.
, and
Hirata
,
Y.
, 2009, “
Aerodynamic Design to Increase Pressure Ratio of Centrifugal Compressors for Turbochargers
,” ASME Paper No. GT2009-59160.
15.
Tamaki
,
H.
, 2010, “
Effect of Recirculation Device on Performance of High Pressure Ratio Centrifugal Compressor
,” ASME Paper No. GT2010-22570.
16.
Murooka
,
T.
,
Goto
,
S.
,
Mizuta
,
I.
, and
Kodama
,
H.
, 2007, “
Design and Development of Advanced Transonic Fan Rotor
,”
Proc. 18th ISABE
, Beijing, China, Paper No. 2007-1136.
17.
Lakshiminarayama
,
B.
, 1996,
Fluid Dynamics and Heat Transfer of Turbomachinery
,
Wiley
,
New York
, pp.
339
347
.
18.
Greitzer
,
E. M.
,
Tan
,
C. S.
, and
Graf
,
M. B.
, 2004,
Internal Flow Concepts and Applications
,
Cambridge University
,
Cambridge
, Chap., 8, pp.
140
142
.
You do not currently have access to this content.