*H. J. Reissner, L. Meyerhoff*

*naca-tn-2493*

*Oct 1951*

A method of designing circular blade systems of finite spacing is developed. The theory of a flow through a system of infinitesimally spaced surfaces is formulated by means of a continuous axially symmetric force field which is uniform in the circumferential direction. This force field replaces the effect of the blade system, with its hub and shroud boundary surfaces. The force field in the space between the blades, the hub, and the shroud is replaced in the equations of finite spacing by those inertia and pressure terms which were omitted in the equations of infinitesimal spacing. These terms will change the values of the flow variable of infinitesimal spacing.

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