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The regenerative turbomachine was investigated as a pressure-increasing device, using both air and water as working fluids. Three machines were involved, representing two geometries. A non-dimensional correlation was developed, relating pressure and flow to driving torque. This was confirmed by experiments, using data from widely separated investigations. This information was used to prepare a study of maximum efficiency as a function of specific speed. A single loss coefficient was found to be the governing parameter.

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Over a broad range of temperatures and pressures the Joule-Thomson coefficients have been computed from the enthalpy equations developed by the International Formulation Committee, 1967. The computed data are compared with the available experimental determinations, including some hitherto unpublished values.

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