This paper presents an investigation of map width enhancement and the performance improvement of a turbocharger compressor using a series of static vanes in the annular cavity of a classical bleed slot system. The investigation has been carried out using both experimental and numerical analysis. The compressor stage used for this study is from a turbocharger unit used in heavy duty diesel engines of approximately 300 kW. Two types of vanes were designed and added to the annular cavity of the baseline classical bleed slot system. The purpose of the annular cavity vane technique is to remove some of the swirl that can be carried through the bleed slot system, which would influence the pressure ratio. In addition to this, the series of cavity vanes provides a better guidance to the slot recirculating flow before it mixes with the impeller main inlet flow. Better guidance of the flow improves the mixing at the inducer inlet in the circumferential direction. As a consequence, the stability of the compressor is improved at lower flow rates and a wider map can be achieved. The impact of two cavity vane designs on the map width and performance of the compressor was highlighted through a detailed analysis of the impeller flow field. The numerical and experimental study revealed that an effective vane design can improve the map width and pressure ratio characteristic without an efficiency penalty compared to the classical bleed slot system without vanes. The comparison study between the cavity vane and noncavity vane configurations presented in this paper showed that the map width was improved by 14.3% due to a significant reduction in surge flow and the peak pressure ratio was improved by 2.25% with the addition of a series of cavity vanes in the annular cavity of the bleed slot system.

References

References
1.
Fisher
,
F. B.
,
1988
, “
Application of Map Width Enhancement Devices to Turbocharger Compressor Stage
,”
SAE
Technical Paper No. 880794.10.4271/880794
2.
Nikpour
,
B.
,
2004
, “
Turbocharger Compressor Flow Range Improvement for Future Heavy Duty Diesel Engines
,”
THIESEL-2004 Conference on Thermo- and Fluid Dynamic Processes in Diesel Engine
s
, Valencia, Spain, September 7–10.
3.
Hunziker
,
R.
,
Dickmann
,
H. P.
, and
Emmrich
,
R.
,
2001
, “
Numerical and Experimental Investigation of a Centrifugal Compressor With an Inducer Casing Bleed System
,”
P. I. Mech. Eng. A: J. Pow. Energy
,
215
(
6
), pp.
783
791
.10.1243/0957650011538910
4.
Ishida
,
M.
,
Sakaguchi
,
D.
, and
Ueki
,
H.
,
2006
, “
Effect of Pre-Whirl on Unstable Flow Suppression in a Centrifugal Impeller With Ring Groove Arrangement
,” ASME Turbo Expo 2006, Barcelona, May 8–11,
ASME
Paper No. GT2006-90400.10.1115/GT2006-90400
5.
Xinqian
,
Z.
,
Yangjun
,
Z.
,
Mingyang
,
Y.
,
Takahiro
,
B.
, and
Hideaki
,
T.
,
2010
, “
Stability Improvement of High-Pressure-Ratio Turbocharger Centrifugal Compressor by Asymmetric Flow Control: Part II—Non-Axisymmetric Self Recirculation Casing Treatment
,” ASME Turbo Expo 2010, Glasgow, UK, June 14–18,
ASME
Paper No. GT2010-22582.10.1115/GT2010-22582
6.
Yamaguchi
,
S.
,
Yamaguchi
,
H.
,
Goto
,
S.
, and
Nakamura
,
F.
,
2002
, “
The Development of Effective Casing Treatment for Turbocharger Compressor
,” Proceedings of the 7th IMechE International Conference on Turbochargers and Turbocharging, London, May 14–15, Paper No. C602/016/2002.
7.
Mohtar
,
H.
,
Chesse
,
P.
, and
Chalet
,
D.
,
2011
, “
Effect of a Map Width Enhancement System on Turbocharger Centrifugal Compressor Performance and Surge Margin
,”
P. I. Mech. Eng. D: J. Auto. Eng.
,
225
(
3
), pp.
395
405
.10.1177/2041299110393191
8.
Barton
,
M. T.
,
Mansour
,
M. L.
,
Liu
,
J. S.
, and
Palmer
,
D. L.
,
2006
, “
Numerical Optimization of a Vaned Shroud Design for Increased Operability Margin in Modern Centrifugal Compressors
,”
ASME J. Turbomach.
,
128
(
4
), pp.
627
631
.10.1115/1.2187526
9.
Whitfield
,
A.
, and
Abdullah
,
A. H.
,
1998
, “
The Performance of a Centrifugal Compressor With High Inlet Pre-Whirl
,”
ASME J. Turbomach.
,
120
(
3
), pp.
487
493
.10.1115/1.2841744
10.
Galindo
,
J.
,
Serrano
,
J. R.
,
Margot
,
X.
,
Tiseira
,
A.
,
Schorn
,
N.
, and
Kindl
,
H.
,
2006
, “
Potential of Flow Pre-Whirl at the Compressor Inlet of Automotive Engine Turbochargers to Enlarge Surge Margin and Overcome Packaging Limitations
,”
Int. J. Heat Fluid Flow.
,
28
(
3
), pp.
374
387
.10.1016/j.ijheatfluidflow.2006.06.002
11.
Sivagnanasundaram
,
S.
,
Spence
,
S.
,
Early
,
J.
, and
Nikpour
,
B.
,
2011
, “
An Impact of Various Shroud Bleed Slot Configurations and Cavity Vanes on Compressor Map Width and the Inducer Flow Field
,” ASME Turbo Expo 2011, Vancouver, Canada, June 6–10,
ASME
Paper No. GT2011-45629.10.1115/GT2011-45629
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