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HIGH BOOST TURBOCHARGERS radial and mixed flow turbines

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HIGH BOOST TURBOCHARGERS radial and mixed flow turbines ( high-boost-turbochargers-radial-and-mixed-flow-turbines )

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RADIAL AND MIXED FLOW TURBINE OPTIONS FOR HIGH BOOST TURBOCHARGERS ABSTRACT Nick Baines Concepts NREC Presented at 7TH INTERNATIONAL CONFERENCE ON TURBOCHARGERS AND TURBOCHARGING May 14-15 2002 This paper demonstrates that there are definite and predictable limits to the boost pressure obtainable when the turbocharger compressor is driven by a conventional single stage radial turbine. Present engine requirements go beyond these limits. The usual solution is a series turbocharging arrangement which brings additional complexity and parts count. Alternative single stage turbines for high boost pressures are investigated. It is shown that mixed flow turbine concepts can achieve stage loadings that are about 20% greater than those of a conventional radial turbine, without any increase in blade speed and maintaining structural integrity. The design of such a turbine is described. Current developments in new turbine rotor materials offer an alternative route to this goal, and the prospects for this are also considered. NOTATION C absolute velocity h enthalpy U blade speed β relative flow angle φ flow coefficient ψ stage loading coefficient Subscripts m meridional θ tangential 0 stagnation state 2 rotor inlet 3 rotor exit

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