The aerodynamic design of turbochargers is described, covering radial compressors and turbines and also axial turbines. The paper concentrates upon those aspects that are peculiar to turbocharger design, including the approach adopted, and highlights the importance of company-specific empirical data. Turbochargers have to be physically adaptable to suit many different sizes of engine, with a great variety of operating duties. The need for turbochargers to achieve the highest obtainable performance at the lowest cost while maintaining durability levels comparable with the engine contributes to the design challenges that are discussed.
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