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their respective inlet blade tip angles (per Ref 12). It appears that decreas- ing the inlet angle from 60 ° to 45 ° , which makes the inducer more 'hubless', has adverse effect on the cavitation performance. This is most likely caused by absence of head which can be generated at The large variation in speed between the long and short spinner for apparent but could possibly be the result of can collapse before passing into the inducer. the inducer inlet eye. breakdown suction specific the 60° hubless inducer is not providing a cavity where vapor b. Comparison of High Frequency Data Figures 55 and 56 show a comparison of the high frequency pressure oscillations at the suction and discharge, respectively. All the data shown was in a frequency range of between 5 and 30 Hertz, with the predominent frequency being 20 Hertz. Any data recorded outside this range was either exactly 60 Hertz, which was undoubtedly electrical noise, or had an insignificant peak-to-peak pressure magnitude. The ordinate value on Figure 55 represents the peak-to-peak normalized head coefficient; a value of 0,03 would be approxi- mately 10% of the discharge head coefficient. The ordinate value on Figure $6 is a ratio of the peak-to-peak pressure to the discharge pressure. The abscissa value for both figures is the normalized suction pressure parameter, The con- ventional inducer shows smooth suction operation at the design flow over the total suction pressure range. At the 80% flow the _pp has increased, but returns to approximately the same value as the design when complete cavitation is approached. The 110% flow pressure oscillations, in general, fall between the design and 80% flow but has a resonance at T = 0.i. The 60 ° hubless inducer has suction pressure oscillations slightly higher than the conventional with little difference between the long and short spinner. Peak-to-peak pressure oscillations were largest for the 45° hubless inducer, occurring over the entire suction pressure range. There was no difference in pressure magnitude between short and long spinner. In almost every case the design flow pressure oscillations were less than the 80% and 110% flow conditions. The discharge peak-to-peak pressure oscillations (Figure 56) were less than 10% of the discharge pressure for all inducers down to a • value of 0.2. From T = 0.2 to T = 0.075, the conventional inducer and both the short and long spinner versions of the 60 ° hubless decreased in pressure oscillation to approximately 2%. The 45 ° hubless inducer, short and long spinner, increase in pressure oscillation over the same range. From T = 0.075 to minimum, all inducers show an increase in discharge pressure oscillation, with the 45 ° hubless having the highest value of 25%. 76 I_ TITPDF Image | HUBLESS INDUCER FLOW HYDRAULIC TURBINE INDUCER BOOST PUMP
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