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although less efficient, was far more tolerant of fluid mismatch, as described in Ref 20. A constant section blade with blunt leading edge also provided a larger surface area to which the outer shroud could be attached. Figure 22 shows the predicted blade element performance with most of the work being done at the blade tip. The discharge flow is nearly uniform, a condition most desirable for the downstream main pump. The magnitude of the discharge fluid whirl distribution is relatively small. In most design configurations, zero fluid whirl at the turbine discharge would be desirable, although the main stage blade velocity will be the speed ratio times the turbine blade velocity so that fluid whirl becomes less significant. V. DETAILED HARDWARE AND FABRICATION A. HARDWARE DATA Upon completion of the hydrodynamic design, a master layout was made. This layout, Drawing No. 1158734, included all linear dimensions, blade profile dimensions, materials, specifications, tolerance stackups, con- centricity and other necessary fabrication information. The drive assembly, P/N 1154352, was obtained from the program described in Ref 3. This drive unit can be either directly coupled to an electric motor through a torque meter and eddy current variable speed clutch or driven by a gas turbine. The first setup was used for steady-state cavitation and non-cavitation testing, while the latter was used for transient testing. B. DESCRIPTION OF MAJOR HARDWARE The hubless inducer shown in Figure 23 is in the unmodified condition which is the 60° inlet angle. The inducer was machined on a center hub, then brazed into an outer shroud, and finally machined to remove the center hub. Figure 24 shows the front view of the conventional inducer. This inducer is contained within the shroud as shown in Figure 2. The blade contours at the discharge are identical to those of the hubless inducer. The conventional inducer and transition (aft) section are shown in Figure 25. The transition section will mate with either the conventional or hubless inducer. This component was also made by machining the blade contour on the hub then brazing the shroud to the blade tips. Figure 26 shows the rotor which is powered by the main shaft and is located between the inducer and hydraulic turbine. The rotor configuration is not unlike a high solidity axial flow airfoil blade. The condition shown is after the modification, during which approximately one-half the blade thickness was removed from the suction side. This modification resulted in a "flat-plate" blade with a slight amount of camber at the discharge. 33PDF Image | HUBLESS INDUCER FLOW HYDRAULIC TURBINE INDUCER BOOST PUMP
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