Scaling of a Radial Turbine for Turbocharger of a Lean Combustion Engine

Document Type : Original Article

Authors

• Mahyar Mafakhery ¹
• Asra Amani ²
• Ali Madadi ²

¹ Department of Aerospace Engineering, Amirkabir University of Technology

² Department of Aerospace Engineering, Amirkabir University of technology

10.22067/jacsm.2021.71634.1045

Abstract

This research is focused on scaling of a radial turbine for turbocharger of a lean combustion engine. One of the methods to decrease pollution is to reduce the exhaust temperature using lean combustion. So, more air should be entered the engine, and by increasing the air, the turbocharger should be changed for increased mass flow rate. In the first step, the turbine performance is simulated using a CFD solver, and the results are compared to the experimental data. Next, the turbine is scaled by four scenarios, and the turbines' performance is simulated using the CFD solver. In the first scenario, only the hub radius is decreased, and the mass flow is increased by 0.5%. In the second scenario, the hub radius decreases, and the shroud radius increases, and a 7% improvement is obtained. In the third scenario, the inlet and shroud radius increase while the hub radius decreases, and the mass flow is improved by 11%. In the fourth scenario, the geometry is changed freely, and a 20% increment is obtained.

Keywords

• Radial turbine
• Turbocharger
• CFD
• Scaling

Main Subjects

• Turbo machinery

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References

1. Alaviyoun, S.S. and M. Ziabasharhagh. "Experimental thermal investigation of turbocharger in internal combustion engine and considering effect of electrical water pump on heat soak test", Modares Mechanical Engineering, 17, pp. 266-274, (2018).
2. Whitfield, A. "The preliminary design of radial inflow turbines", in ASME International Gas Turbine and Aeroengine Congress and Exposition, American Society of Mechanical Engineers, (1989).
3. Aungier, R.H "Turbine Aerodynamics: axial-flow and radial-flow turbine design and analysis", ASME, (2006).
4. Chen, H. and N. Baines "Analytical optimization design radial and mixed flow turbines". Journal of Power and Energy, Vol. 206, 177-187,  (1992).
5. Daabo, A.M., et al "Development of three-dimensional optimization of a small-scale radial turbine for solar powered Brayton cycle application", Applied Thermal Engineering, Vol. 111, pp. 718-733, (2017).
6. Surekha, N., et al." Optimization of principal dimensions of radial flow gas turbine rotor using genetic algorithm", International Journal of Scientific & Engineering Research, Vol. 3 (2017).
7. Mueller, L., Z. Alsalihi, and T. Verstraete. "Multidisciplinary optimization of a turbocharger radial turbine", Journal of Turbomachinery, 135, pp. 210-220, (2013).
8. Baar, Bojan Savic- Rainer Zimmermann- B. Jander- Rolan" Radial Turbines". European Conference on Turbomachinery Fluid dynamics & Thermodynamics. Berlin: s.n., (2017).
9. Zargar, A. and A. tousi "1D radial turbine design for gasturbine".
10. Whitfield, A, N.C. Baines "Design of radial turbomachines". (1990).
11. Eichhorn, R et al. "Redesign of a radial turbine variable stator geometry with optimized free space parameter for improved efficiency", SAE, (2017).