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3. Turbine The hydraulic turbine must supply power to drive the inducer and shroud. Since the shroud consists of both the radial and axial hydro- static bearings, the drag torque in water will be higher than if this system were tested in liquid hydrogen. For this reason, somemodification to the turbine would be necessary in order to maintain a constant 2.14 speed ratio in liquid hydrogen. Again the flow annulus of the turbine was maintained the same as the rotor; this was done for ease in manufacturing of the turbine and adjacent components. On an actual pumping system the turbine discharge annulus would be designed to match the inlet of the downstream main pump. The design specifications for the turbine are as follows, again subject to change based on inducer testing. l IV. HYDRODYNAMIC Tip Diameter Hub Diameter Flow Coefficient Head Coefficient Drop Speed Flow DESIGN 7.142 in (0.181 m) 5. 714 in (0.143 m) 0.117 0.75 14,000 rpm (1470 rad/s) 4,900 gpm (0.309 m3/s) With the nondimensional parameters of head and flow coefficient set from the parametric mean line analysis, a detailed hydrodynamic design was done on each of the blade rows, the end result of this design phase being blade coordinates for manufacturing. Since the resulting boost pump was a low head machine, the change in the hydrogen fluid properties was not con- sidered. The nondimensional liquid hydrogen design data is therefore the same as the incompressible water test data. A. INDUCER An inducer head coefficient of 0.35 at the mean represents a moderately heavily loaded blade row. Since it was desirable to design for uniform discharge inducer flow and head, the inducer was divided into a tandem design with a separate forward and aft section. The aft section, or transition, would be exactly the same component for each inducer, hubless or conventional. This resulted in an inducer concept similar to that of Ref 14. The head rise in each section is approximately one-half of the total. i. Forward Section The forward section of the inducer provides the basic cavitation performance of the pumping machine. 20 IPDF Image | HUBLESS INDUCER FLOW HYDRAULIC TURBINE INDUCER BOOST PUMP
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