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i. Conventional Inducer Figure 49 shows the cavitation performance of the con- ventional inducer at three different flow coefficients. The highest suction specific speed values shown are very near complete breakdown since further decreases in suction head were not possible at constant flow coefficient. At the design flow coefficient, head breakdown occurs at 43,000 (15.7) which is equivalent to _/_2 = 2.67, the minimum value per Ref 12. Both the 80% and 110% flow show less margin than the design. 2. Hubless Inducer (60 ° ) Figure 50 shows the 60 ° long spinner hubless inducer cavitation performance at two flow coefficients. At the 80% flow coefficient, the water temperature exceeded 190°F. At this flow, 10% head loss could not be obtained because of the facility flow limit. It appears, however, that the value would exceed 50,000 (18.2). The data for the 60° short spinner hubless inducer is shown on Figure 51 at three flow coefficients. At 80% flow the inducer pumped with- out excessive loss up to a suction specific speed of 59,000 (21.5). This is reasonably close to the predicted value (by Ref 12) for an inducer with this inlet blade tip angle. The incidence to blade angle ratio for optimum performance is near the 80% flow since the hubless inducer does not have hub blockage (16%). 3. Hubless Inducer (45 ° ) Figure 52 and 53 show the 45 ° hubless inducers, with the long spinner and short spinner, respectively, at three different flow coefficients. These flow coefficients were chosen (see Figure 39), so as to not fall on a discontinuing portion of the head flow curve. The maximum suction specific speed was approximately the same for both spinners. Again the maximum suction specific speed value shown represents the near breakdown point since any decrease in suction pressure caused the head to drop below that required to pump the test flow loop. 4. Inducer Comparison a. Comparison of Previous Data Figure 54 shows the cavitation performance of all the inducers at the design flow coefficient. The difference in head coefficient at low suction specific speed (non-eavitating) is indicative of the head - flow relationship discussed in previous sections. The conventional inducer shows the typical drop in head, usually less than 5%, at about 15,000 (5.5) suction specific speed and then a slight increase until breakdown. The 60° hubless, however, showed an almost continuous increase in head until breakdown occurred. The 45° hubless had a continual decrease in head as the suction specific speed was increased. Both the conventional inducer and the 60° short spinner hub]ess inducer obtained approximately the maximum suction specific speed possib|e for 70 rrl_i!PDF Image | HUBLESS INDUCER FLOW HYDRAULIC TURBINE INDUCER BOOST PUMP
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