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 11 Typical results for single entry casing and comparisons with experiment are shown in Figures 9a and 9b, the former applying to measured and calculated pressures at different stations, and the latter to time averaged mass flow, power and efficiency. 1P refers to the pulse (characteristics) treatment, and 1Q to the quasi steady treatment. It will be observed that discrepancies between the two treatments are slight, and that therefore the much simpler quasi steady flow treetment may safely be used. 4. THREE+DIMENSIONALAND PLOTTING PROGRAMS This sectibn should be read in conjunction with Section 2, ie as an extension of the 1-D techniques and intended to form, with these, a complete design or analysis procedure. The wolJc arose, initially, out of a research project intended to lead to the design, manufacture and testing of a small mixed flow turbine having the same rotor diameter and speed as a conventional inward radial flow turbine, but required to give an increase in mass flow over the latter of the order of 30% without significant loss of total to static efficiency. Accordingly parametric studies were first undertaken using the (modified) 1-D treatment of Section 2 to establish the possibility of such an increase in mass flow subject to the above restrictions and without exceeding 'reasonable' blade height. Details must again be omitted, but the parameter study, cycling systematically over many values of nozzle exit angle aNB rotor entry angle 32, 'cone angle' $I, blade height at entry b2, meridional velocity ratio j, etc. eventually produced a small number of possible configurations satisfying the above criteria.

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