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36 blades area to flow Axial length blade height blade surface velocities Carbon face seals carbon resistor probes cavitation centrifugal pump rotor clearance coefficient of 0.2 Compressible Flow decrease Dewar diameter ratio ditions excess area excess flow area flange fluid losses fluid tangential velocity fluid velocities ft/sec head coefficient helium hub and shroud hydraulic efficiency impeller increase indicated inlet tip vector inlet-diameter ratio large changes Large numbers Lewis Research Center liquid hydrogen NACA NASA nitrogen operational and mechanical passage length pounds per square pressure coefficient pressure transducers pump inlet PUMP ROTOR DESIGN pump rotor passage pumps for liquid purge radial outlet pump radial-bladed relative velocities result rotor discharge rotor tip speed shown in figure shroud is shown shrouded pump rotor slip factor speed of 392 splitter blades stream-filament suction specific speed surface area Teflon test loop tip vector diagram torus unshrouded rotor utilized valves vapor pressure velocity gradients