Research on pumps, particularly those for transporting cryogenic fluids, is very expensive. Rocketdyne has tested pumps with air as the working fluid and has found that a very good correlation exists between air test data and liquid test data. This paper gives a description of the air rigs used by Rocketdyne and compares the data taken in air with data taken in water, LOX, RP-1, and liquid hydrogen. Also presented is the effect of tip clearance on the head of an axial-flow pump as determined from air tests.

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