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Numerical Study of Ultra Low Solidity Airfoil Diffuser in an Automotive Turbocharger Compressor
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 20, 2009 by SAE International in United States
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For the application of advanced clean combustion technologies, such as diesel HCCI/LTC, a compressor with high efficiency over a broad operation range is required to supply a high amount of EGR with minimum pumping loss. A compressor with high pitch of vaneless diffuser would substantially improve the flow range of the compressor, but it is at the cost of compressor efficiency, especially at low mass flow area where most of the city driving cycles resides.
In present study, an ultra low solidity compressor vane diffuser was numerically investigated. It is well known that the flow leaving the impeller is highly distorted, unsteady and turbulent, especially at relative low mass flow rate and near the shroud side of the compressor. A conventional vaned diffuser with high stagger angle could help to improve the performance of the compressor at low end. However, adding diffuser vane to a compressor typically restricts the flow range at high end. Due to the limitation of flow range, vaned diffuser is mostly used on turbocharger compressor for large diesels where the work conditions don’t vary too much; e.g., generation sets. Due to the wide operation range requirement in a light duty automotive diesel application, a centrifugal compressor with ultra low solidity airfoil diffuser was designed. Calibrated CFD simulation was carried out to predict its performance. It was also compared with the performance of the compressor with the same impeller but vaneless diffuser. The preliminary results showed that the ultra low solidity airfoil diffuser could improve the stage efficiency while maintaining a wide flow range of the compressor.
CitationHu, L., Yang, C., Krivitzky, E., Larosiliere, L. et al., "Numerical Study of Ultra Low Solidity Airfoil Diffuser in an Automotive Turbocharger Compressor," SAE Technical Paper 2009-01-1470, 2009, https://doi.org/10.4271/2009-01-1470.
- Kimura, S. et al, SAE2001-01-0200, “Ultra-clean combustion technology combining a low-temperature and premised combustion concept for meeting future emission standards”
- Olsson, J. et al, SAE 2004-01-0940, “Boosting for high load HCCI”
- Buchwald, R. et al, SAE2004-01-0936, “Adaptation of injection system parameters to homogeneous diesel combustion”
- Senoo, Y. Low solidity cascade diffusers for wide flow range centrifugal blowers. ASME paper 83-GT-3, 1983.
- Senoo, Y. Low solidity cascade diffusers for wide flow range centrifugal blowers. Von Karmen Institute for Fluid Dynamics, Brussels, Lectures series 7, 1984.
- Sorokes, J. M. and Welch, J. P. Experimental results on a rotatable low solidity vaned diffuser. ASME paper 92-GT-19, 1992.
- Jiang, P. M. and Whitefield, A. Investigation of vaned diffusers as a variable geometry device for application to turbocharger compressors. Proc. Inst. Mech Engrs, Part D, 1992, 206 (D3), 209~220.
- Reddy, T. et al. Effect of the setting angle of a low-solidity vaned diffuser on the performance of a centrifugal compressor stage. Proc. Inst. Mech Engrs, Part A, 2004, 218 (A8), 637~646.
- Engeda A. The design and performance results of simple flat plate low solidity vaned diffusers. Proc. Inst. Mech Engrs, Part A, 2001. 215 (A1), 109~118.
- Eynon, p. A. and Whitfield, A. The effect of low-solidity vaned diffusers on the performance of a turbocharger compressor. Proc. Inst. Mech Engrs, Part C, 1997. 211 (C5), 325~339.
- Yoshinaga Y., Kaneki T., Kobayashi H., et al. A study of performance improvement for high specific speed centrifugal compressors by using diffusers with half guid vanes. Journal of Fluids engineering, 1987. 109, 359~367.
- Sitaram N and Issac J M. An experimental investigation of a centrifugal compressor with hub vane diffuser. Proc. Inst. Mech Engrs, Part A, 1997. 211(A5): 411~427.
- Liu R., Xu Z. Numerical investigation of a high speed centrifugal compressor with hub vane diffusers. Proc. Inst. Mech Engrs, Part A, 2004. 218(A3): 155~169.
- Abdelwahabr A. A new three-dimensional aerofoil diffuser for centrifugal compressors. Proc. Inst. Mech Engrs, Part A, 2008. 222(A8): 819~830.
- Giles, MB. Non-reflecting boundary conditions for the Euler equations. Technical report TR-88-1, MIT Computational Fluid Dynamics Laboratory, 1988.
- He, L. and Ning, W. Efficient approach for analysis of unsteady Viscous flows in turbomachines, AIAA Journal, Vol. 36, NO. 11.
- Vilmin S., Hirsch. Ch. et al. Unsteady flow modeling across the rotor/stator interface using the nonlinear harmonic method. ASME paper no. GT-2006-90210.