IGTC-76 A Non-Dimensional Matching and Conceptual Design Procedure for Turbochargers(Session C-8 TURBOCHARGERS)
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概要
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A non-dimensional conceptual design procedure for turbochargers is developed. The design procedure starts from a specification of the required compressor pressure ratio and efficiency and considers the adoption of either a radial inflow turbine or a mixed flow turbine, together with a centrifugal compressor with alternative degrees of discharge blade backsweep. The corresponding design requirements for the turbine are developed through the non-dimensional matching requirements. The non-dimensional design of the turbine is considered through the application of the published empirical data (largely that due to Rodgers, in order to identify the limitations of the data, particularly with respect to the application to mixed flow turbines, and develop the overall geometry. The effect on the compressor design of any design options taken for the turbine are assessed through the matching conditions and the basic impeller geometry developed. The procedure is applied to a turbocharger where the requirement was for a compressor pressure ratio of 3.6 to 1. The design is developed non-dimensionally from a knowledge of the compressor pressure ratio (3.6:1), a target efficiency for the compressor (73%), and the inlet stagnation temperature at turbine inlet (923K). The latter parameter was defined through engine matching considerations (which are not developed) and is based on an assumed atmospheric inlet temperature of 288K.
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