Investigation of a centrifugal compressor and study of the area ratio and TIP clearance effects on performance
In this research, the centrifugal compressor of a turbocharger is investigated experimentally and numerically.
Performance characteristics of the compressor were obtained experimentally by measurements of rotor speed and flow parameters at the inlet and outlet of the compressor. Three dimensional flow field in the impeller and diffuser was analyzed numerically using a full Navier-Stokes program with SST turbulence model. The performance characteristics of the compressor were obtained numerically, which were then compared with the experimental results. The comparison shows good agreement. Furthermore, the effect of area ratio and tip clearance on the performance parameters and flow field was studied numerically. The impeller area ratio was changed by cutting the impeller exit axial width from an initial value of 4.1 mm to a final value of 5.1 mm, resulting in an area ratio from 0.792 to 0.965. For the rotor with exit axial width of 4.6 mm, performance was investigated for tip clearance of 0.0, 0.5 and 1.0 mm. Results of this simulation at design point showed that the compressor pressure ratio peaked at an area ratio of 0.792 while the efficiency peaked at a higher value of area ratio of 0.878. Also the increment of the tip clearance from 0 to 1 mm resulted in 20 percent efficiency decrease.
Keywordscentrifugal compressor area ratio tip clearance effect
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- Chen, H. Conner, W., 2002, “Turbocharger Compressor Development for Passenger Car Gasoline Engine Applications,” The 7th Conf. on Turbochargers and turbocharging, IMechE, London, pp. 13–22Google Scholar
- Kouidri, S., and Asuaje, M., 2005, “Numerical Modelization of the Flow in Centrifugal Pump: Volute Influence in Velocity and Pressure Fields,” International Journal of Rotating Machinery, Vol. 3, pp. 244–255.Google Scholar
- Paßrucker, H. and Van den Braembussche, R. A., May 2000, “Inverse Design of Centrifugal Impellers by Simultaneous Modification of Blade Shape and Meridional Contour,” in Proc.45th ASME International Gas Turbine and Aeroengine Congress and Exposition, Munich, Germany.Google Scholar
- Cravero, C., July 2002, “A Design Methodology for Radial Turbomachinery. Application to Turbines and Compressors,” in Proc. ASME Fluid Engineering Division Summer Meeting (FEDSM’ 02), Montreal, Quebec, Canada, paper FEDSM2002-31335.Google Scholar
- Sloteman, D. and Saad, A. and Cooper, P., May–June 2001, “Design of Custom Pump Hydraulics Using Traditional Methods,” in Proc. ASME Fluid Engineering Division Summer Meeting (FEDSM’01), New Orleans, LA, USA, paper FEDSM2002-18067.Google Scholar
- Mugli, F., Holbein, P. and Dupont, P., May–June 2001, “CFD Calculation of a Mixed Flow Pump Characteristic from Shut-off to Maximum Flow,” in Proc. ASME Fluid Engineering Division Summer Meeting (FEDSM’01), New Orleans, LA, USA, paper FEDSM2001-18072.Google Scholar
- Cravero, C. and Marini, M., July 2002, “Modeling of Incompressible Three-Dimensional Flow in Rotating Turbomachinery Passages,” in Proc. ASME Fluids Engineering Division Summer Meeting (FEDSM’02), Montreal, Quebec, Canada, paper FEDSM2002-31177.Google Scholar
- Tamm, A., Gugau, M. and Stoffel, B. 2002, “Experimental and 3-D Numerical Analysis of the Flow Field in Turbomachines, Part 1,” International Congress on Quality Assessment of Numerical Simulation in Engineering, University of Conception, Chile.Google Scholar
- Menter, F. R., Kuntz, M., and Langtry, R. 2033, “Ten Years of Experience with the SST Turbulence Model,” In K. Hanjalic, Y. Nagano, and M. Tummers, editors, Turbulence, Heat and Mass Transfer 4, pp. 625–632, Begell House Inc. New York.Google Scholar
- Lam, J.K.W., Robert, Q.D.H. and MacDonnell, G., 2002, “Flow Modeling of a Turbocharger Turbine under Pulsating Flow,” The 7th Conf. on Turbocharger and Turbocharging, London, pp. 181–197.Google Scholar
- [16.BS-1042, “Method of Measurement of Fluid Flow in Closed Conduits,” British Standards, 1981.Google Scholar
- Chapman, K.S., Kuiper, D.G. and Keshavarz, A., 2004, “Field Turbocharger Compressor Performance Enhancement by Minor Flow Modification,” GMRC Gas Machinery Conf., New Mexico, October 4–6.Google Scholar
- Cumpsty, N. A., 1999, “Compressor Aerodynamics,” Longman Scientific, University of Cambridge.Google Scholar
- Stanitz, J. D., 1952, “Some Theoretical Aerodynamic Investigations of Impellers in Radial and Mixed-Flow Centrifugal Compressors,” Trans. ASME 74: 473–497.Google Scholar
- Watson N. and Janota M.S., 1982, “Turbocharging the Internal Combustion Engine“, Macmillan, London, Wiley, New York.Google Scholar
- Eckardt, D., 1976, “Detailed Flow Investigations Within a High Speed Centrifugal Compressor Impeller,” Transactions ASME, pp. 390–402.Google Scholar
- Reunanen, A., 2001, “Experimental and Numerical Analysis of Different Volutes in a Centrifugal Compressor,” Ph.D thesis at Acta University of Technology in Finland. ISSN 1456-4491.Google Scholar
- Cheng, X. and Michael, M., 2005, “Development and Design of a Centrifugal Compressor Volute,” International Journal of Rotating Machinery, Vol. 3, pp. 190–196.Google Scholar