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2. Hubless Inducer with 60 ° Inlet Figure 35 shows the normalized input torque and efficiency for several speeds over a flow coefficient range of 25% to 125% of the design flow coefficient. The input torque appears flat and continuous while the efficiency has a double peak. The head coefficient shown on Figure 36 has an inflection at the same flow coefficients. Also shown is the inducer efficiency without the shroud drag torque. The shroud drag torque used to calculated efficiency was exactly the same as that determined from the conventional inducer testing. The inflection in the head flow and efficiency flow curves can most likely be attributed to flow shifts within the inducer. Most of the head is generated near the tip of the inducer as shown in Figure 37. The head values at radial stations 20% and 50% are almost the same and are approximately ' 3. 60% of the head at the 80% radial station. Hubless Inducer with 45 ° Inlet Figure 38 shows the normalized torque and efficiency vs. flow coefficient for two different speeds over a flow coefficient range of 12 to 125% of the design. Again the efficiency shown is based on input torque, which includes both inducer torque and shroud drag torque. The head coefficient and efficiency vs. flow coefficient curves shown on Figure 39 have inflections which are most likely caused by the radial flow shifts within the inducer. Figure 40 shows the head coefficient at four radial stations. This curve also shows that flow shifts are occuring at two flow coefficients: 0.16 and 0.25. 4. Inducer Comparison By juxtapositioning Figures 31, 35 and 38, Figures 32, 36 and 39, and Figures 33, 37 and 40, the non-cavitating performance comparison of the conventional, 60 ° hubless, and 45 ° hubless inducers can be made. For the first set of figures it can be seen that the normalized input torque is the same for all inducers above a 80% design flow (0.2 flow coefficient). The efficiencies at the design flow are 52%, 42% and 41%, respectively. The second set of figures shows that the inducer efficiency excluding shroud drag is 85% (design value), 69% and 68%, respectively. The head rise coefficients are displaced by the same relative amount as the efficiencies. The final set of figures shows that head coefficients at each radial station for both hubless inducers is considerably less than that of the conventional inducer; this implies that the losses through hubless inducers are greater than those for the conventional inducer, since the discharge blade angles are the same for all three inducers. The tip head coefficient for both hubless inducers should be the same since no modification to the inducer was made at the tip. The Solidity at the tip is much greater for the hubless inducers, which could account for the higher losses due to form drag. It appears that the head - flow relationship of a hubless inducer could be 'tailored' by modification of the inlet angle, although the performance would most likely not exceed that of a conventional inducer. 52 jPDF Image | HUBLESS INDUCER FLOW HYDRAULIC TURBINE INDUCER BOOST PUMP
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