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2. Available Cavitation Data Figure 9 shows the required 3% head loss cavitation number of several axial flow blades (Ref 7 through Ref 12) at various flow coefficients. There is a considerable amount of "scatter" in these data and only one of the blade rows shown was tested with inlet fluid prewhirl. The two solid lines in this figure were taken from two-dimensional flow theory. The upper line represents an incidence to blade angle ratio of 0.425, which is typical of flat plate inducers. The lower line represents an incidence to blade angle ratio that is a function of actual design flow coefficient, as shown in Figure i0. Both of these "theoretical" lines are shown to indicate the relationship between cavitation number and flow coefficient at complete cavitation head breakdown. The cross-hatched data represents pumps produced and tested by ALRC. The required cavitation number of the design rotor obtained from Figure 7 must be less than the available cavitation number selected from Figure 4 at the design conditions in order to ensure cavitation-free rotor operation. The significance of these figures can best be illustrated by an example: Select an operating speed ratio of 2.14 at the conditions shown at the top of Figure 4. A reasonable value of the required cavitation number, from Figure 9 at the inlet flow coefficient of 0.116, is 0.i. From Figure 4 (at the selected speed ratio of 2.14) the inducer head coefficient must be 0.35 to produce an available cavitation number of (0.12) that is greater than the required cavitation number (0.i). This operating point will also satisfy the limits shown on Figure 4 (i.e., less than the 'inducer state-of- the-art', and will produce enough head to pump the D-3A system). If a speed ratio of 2.75 had been selected, the limits of available cavitation number and minimum head to pump the flow loop could be satisfied only by an inducer which exceeded the inducer state-of-the-art. The final condition that must be satisfied is the stable speed ratio criteria developed in Ref 3. This is shown graphically in Figure ii where all designs up to approximately 2.5 would be stable. This criteria is considered conservative since it was developed from a theoretical model that does not consider actual losses to determine the slope of the torque- flow curve. Design speed ratios of 3 most likely could be used before instability occurs. The test data in the following sections will verify the torque stability characteristics of this concept. C. WORK SPLIT AND ANNULAR GEOMETRY SELECTION Based on the previously established design specifications and the cavitation model for the high speed rotor, a pitch or mean line one- dimensional work split analysis was made. The inducer - turbine speed, head, and flow coefficients were selected. 14PDF Image | HUBLESS INDUCER FLOW HYDRAULIC TURBINE INDUCER BOOST PUMP
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