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The test results presented for each blade row are based upon the average of the three Kiel probe readings, unless otherwise noted. pressure electric A. STEADY STATE NON-CAVlTATING The steady state non-cavitating tests were conducted with suction sufficiently high to preclude any cavitation. The drive mode was an motor capable of maintaining constant speed to within + 0.1%. i. Conventional Inducer Figure 31 shows the inducer efficiency and normalized input for several speeds over a flow range of 15 to 130% of the discharge flow torque coefficient. The measured input torque (and, consequently, the efficiency) includes the inducer torque plus the shroud torque. The shroud torque was calculated to be 38.8 ib-ft (52.6N-m) at the design speed. Since there was no direct measurement to verify the calculated shroud drag torque, a value was obtained by subtracting the inducer torque at design flow from the measured input torque; this resulted in a shroud torque value 30% higher than calculated. This value was then normalized with speed and was used at all other speeds and flow coefficients. The inducer head coefficient and efficiency as a function of flow coefficient are shown in Figure 32. Again, it is noted that the inducer efficiency at the design flow was set to the design value. This is justified by the fact that the measured head coefficient has the same value as the design predicted value, therefore, the efficiency at the design point should be near the predicted value. Since the shroud drag at off-design flow coefficient was constant (at constant speed), the off-design efficiency will be true relative to the design point. There appears to be little or no speed effect imposed on the normal data scatter. The inducer shows some stall at approximately 45% of the design flow coefficient. The maximum flow coefficient was determined by the facility flow loop resistance with a fully open valve. The head rise coefficients at four radial stations are shown as a function of discharge flow coefficient in Figure 33. The upper three are total head coefficients measured with total Kiel probes, while the lower one is a static head coefficient measured with a wall tap. Over the flow range shown there is no evidence of inducer stall at the low flow, or inducer choking at the high flow. It appears that zero slope or stall will occur first at the 80% streamline; some stall did occur at slightly lower flow coefficient, as indicated by Figure 32. Figure 34 shows the measured head coefficient at the various radial stations; also shown is the design prediction. The mass-averaged design-predicted head coefficient and the head coefficient determined by average of the three probes agreed within 1%. At the 80% radial station, the measured head coefficient was 13% higher than the predicted value. An average was used to determine blade row performance since the velocity and mass flow distri- bution can not be obtained from Kiel probe readings. 47PDF Image | HUBLESS INDUCER FLOW HYDRAULIC TURBINE INDUCER BOOST PUMP
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