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original rotor is completely absent in the modified rotor. The head coefficient is higher at each radial station over the entire flow range for the modified rotor. To determine what the expected or predicted performance of the modified rotor would be, the design analysis method discussed previously was used with the new deviation angles produced by the change in thickness-to-cord ratio. The results of this prediction can be seen in Figure 71 where the test data is overlaid on the design-predicted values. The mass average of the design-predicted value is the sameas was shownon Figure 69. The suction performance of the modified rotor Js shownin Figure 72. There is no significant difference in performance between the modified and the original rotor (Figure 57). The 80%flow is somewhatless, while the ll0% flow is slightly better. Since the head coefficient of the modified rotor was higher at a given flow coefficient, the blade loading would likewise be higher. In generai, the more highly loaded blades will have lower cavitation performance, as was shown in Ref 3. This could account for the unchanged suction performance; that is, any gain realized by sharpening the lead edge was offset by the higher blade loading. VIII. CONCLUSIONS i. The hubless inducer concept allows the inlet blade tip angle to be increased from the present manufacturing limit of 83 ° to 86 ° . This is accomplished by attaching the blade to a shroud after machining the fluid passages. After attachment the hub is removed and blade leading edge is faired to the desired sharpness. 2. The suction performance of a hubless inducer is limited to that value predicted by Ref 12 for the corresponding inlet blade tip angle. That is, larger blade angles have smaller flow coefficients which, in turn, produce the highest suction specific speed performance. 3. The head coefficient of a hubless inducer is lower than that of a conventional inducer with the same discharge flow coefficient and blade angle. A hubless inducer therefore must be used in an application requiring low head rise inducer, or a downstream stage must be used to produce additional head. 4. Hubless inducers mechanically couple best in shroud driven applica- tions, i.e., with a shrouded pump impeller or a hydraulic turbine driven inducer concept similar to Figure 2. 5. The design method used to predict inducer, rotor, and hydraulic turbine head performance at design flow proved to be very accurate. This accuracy is shown by Figures 31, 34, 41, 44, 45, 47, 69, and 71. 96PDF Image | HUBLESS INDUCER FLOW HYDRAULIC TURBINE INDUCER BOOST PUMP
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