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5. Rotor The rotor efficiency and head coefficient vs. flow coefficient for several speeds over a flow range of 0 to 120%of design is shownin Figure 41. There does not appear to be a speed effect, although the data scatter is greater than normal. Part of the data scatter could be attributed to the calculated rotor inlet pressure, which was obtained from curve fits of the data taken from Figures 33, 37, and 40. The rotor efficiency was approximately four points lower than design, although the maximumdid occur near the design flow coefficient. The input torque used in the efficiency calculation includes the torque from bearing and seal, which are located between rotor and torque meter; this could account for the four percentage points in efficiency. The head coefficient at design flow agrees with the design prediction within 1%. It appears that the rotor has two inflections, one at 0.104 and the other at 0.055. The first is rotor stall, which occurs at 85% design flow. The second, at flow coefficient 0.055, is most likely caused by inducer stall. From this point to zero flow coefficient, the peak-to-peak discharge pressure oscillations increased slightly (zero flow testing was con- ducted only at reduced speed, 60%of design). The head coefficient at each of the four radial measuring stations is shownin Figure 42. It appears that the station nearest the hub stalls first and that the stall progresses toward the tip as the flow is decreased. The data shown is over a flow range of 65 to 120%of design and was taken when the conventional inducer was in the buildup. Figure 43 again shows the rotor head coefficient, with the solid line representing the results from Figure 42 and the symbol data taken from tests with the hubless inducer in the buildup. Since each of these inducers had significantly different head - flow coefficient relationships, the agreement indicated by this plot verifies the validity of the method of determining rotor performance. The actual measuredradial head coefficients flow are shownin Figure 44, where the line represents the predicted method and, again, shows reasonable agreement. 6. Hydraulic Turbine Turbine parameters are normally shown vs. blade velocity/gas velocity, but, for this report, the independent abscissa is flow coefficient: fluid axial velocity/blade velocity. The method was used so that the reader may relate from a pump figure to a turbine figure without changing the flow reference. at the design 59PDF Image | HUBLESS INDUCER FLOW HYDRAULIC TURBINE INDUCER BOOST PUMP
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