In this paper a three-dimensional conjugate calculation has been performed for a passenger car turbo charger. The scope of this work is to investigate the heat fluxes in the radial compressor, which can be strongly influenced by the hot turbine. As a result of this, the compressor efficiency may deteriorate. Consequently, the heat fluxes have to be taken into account for the determination of the efficiency. To overcome this problem a complex three-dimensional model has been developed. It contains the compressor, the oil cooled center housing, and the turbine. Twelve operating points have been numerically simulated composed of three different turbine inlet temperatures and four different mass flows. The boundary conditions for the flow and for the outer casing were derived from experimental test data (Bohn et al.). Resulting from these conjugate calculations various one-dimensional calculation specifications have been developed. They describe the heat transfer phenomena inside the compressor with the help of a Nusselt number, which is a function of an artificial Reynolds number and the turbine inlet temperature.

1.
Bulaty, T., 1974, “Spezielle Probleme der schrittweisen Ladungswechselrechnung bei Verbrennungsmotoren mit Abgasturboladern,” MTZ 35, 6, pp. 177–185.
2.
Rautenberg, M., Mobarak, A., and Malobabic, M., 1983, “Influence of Heat Transfer Between Turbine and Compressor on the Performance of Small Turbochargers,” JSME Paper 83-TOKYO-IGTC-73, Int. Gas Turbine Congress.
3.
Rautenberg, M., and Ka¨mmer, N., 1984, “On the Thermodynamics of Non-Adiabatic Compression and Expansion Process in Turbomachines,” ICMPE, Proceedings of the 5th International Conference for Mechanical Power Engineering, Cairo, Egypt.
4.
Malobabic, M., 1989, “Das Betriebsverhalten Leitschaufel- und bypassgeregelter PKW-Abgasturbolader,” Ph.D. thesis, University of Hannover, Germany.
5.
Bohn, D., and Bonhoff, B., 1994, “Berechnung der Ku¨hl- und Sto¨rwirkung eines filmgeku¨hlten transsonisch durchstro¨mten Turbinengitters mit diabaten Wa¨nden,” VDI-Berichte 1109, pp. 261–275.
6.
Bohn, D., Bonhoff, B., Scho¨nenborn, H., and Wilhelmi, H., 1995, “Prediction of the Film-Cooling Effectiveness of Gas Turbine Blades Using a Numerical Model for the Coupled Simulation of Fluid Flow and Diabatic Walls,” AIAA Paper 95-7105.
7.
Bohn, D., Kru¨ger, U., and Kusterer, K., 2001, “Conjugate Heat Transfer: An Advanced Computational Method for the Cooling Design of Modern Gas Turbine Blades and Vanes,” Heat Transfer in Gas Turbines, B. Sunden and M. Faghri, eds., WIT Press, Southampton, pp. 58–108.
8.
Baldwin, B. S., and Lomax, H., 1978, “Thin Layer Approximation and Algebraic Model for Separated Turbulent Flows,” AIAA Paper 78-257.
9.
Bohn, D., and Scho¨nenborn, H., 1996, “3-D Coupled Aerodynamic and Thermal Analysis of a Turbine Nozzle Guide Vane,” Proceedings of the 19th ICTAM, Kyoto, Japan.
10.
Bohn, D., Bonhoff, B., and Scho¨nenborn, H., 1995, “Combined Aerodynamic and Thermal Analysis of a Turbine Nozzle Guide Vane,” IGTC Paper 108, Proceedings of the 1995 Yokohama International Gas Turbine Congress.
11.
Bohn, D., and Heuer, T., 2001, “Conjugate Flow and Heat Transfer Calculation of a High Pressure Turbine Nozzle Guide Vane,” AIAA Paper 2001-3304.
12.
Kao, K.-H., and Liou, M.-S., 1996, “On the Application of Chimera/Unstructured Hybrid Grids for the Conjugate Heat Transfer,” ASME Paper 96-GT-156.
13.
Han, Z.-X., Dennis, B. H., and Dulikravich, G. S., 2000, “Simultaneous Prediction of External Flow-Field and Temperature in Internally Cooled 3-D Turbine Blade Material,” ASME Paper 2000-GT-253.
14.
Montenay, A., Pate´, L., and Duboue´, J. M., 2000, “Conjugate Heat Transfer Analysis of an Engine Internal Cavity,” ASME Paper 2000-GT-282.
15.
Li, H., and Kassab, A. J., 1994, “Numerical Prediction of Fluid Flow and Heat Transfer in Turbine Blades With Internal Cooling,” AIAA Paper 94-2933.
16.
Li, H., and Kassab, A. J., 1994, “A Coupled FVM/BEM Solution to Conjugate Heat Transfer in Turbine Blades,” AIAA Paper 94-1981.
17.
Bohn, D., 2003, “Conjugate Flow and Heat Transfer Investigation of a Turbo Charger: Part II: Experimental Results,” ASME Paper 2003-38449.
You do not currently have access to this content.