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Design of Radial Inflow and Mixed Flow Turbines 1971

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Design of Radial Inflow and Mixed Flow Turbines 1971 ( design-radial-inflow-and-mixed-flow-turbines-1971 )

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Page 7 Equations (1) to (9) constitute a closed system yielding the required solutions for interspace pressure p2, exit velocity c3 and exit angle a6 mass flow fi = I$ = a, and torque T = rsh + ti. The efficiency (totalto static) may be evaluated from (10) A comparison of calculated and experimental results for a wide range of operating conditions is given in Figures 1(and 5. It should be noted that the 'shock' model applies equally to rotor speeds above and below the design point. (b) Choked Nozzle (High Overall Pressure Ratios) (Figures 6a and b) The thermodynamic model used to describe the flow under these conditions is that of sonic conditions in the nozzle throat followed by a Prandtl Meyer expansion from the nozzle throat pressure pN to the interspace pressure p2. This, in turn, is followed by the constant pressure 'shock' described in the previous section. The representation of the flow is similar 4 to that postulated by Jansen, but arrived at quite independently.

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