The two-dimensional radial flow pump impeller has significant advantages for the study of the transfer and diffusion of energy. It is well adapted to experimental investigation and permits accurate and economical design modifications. The present study was undertaken
to evaluate the essential limitations of a special series of two-dimensional impellers by photographic and hydrodynamic techniques which are described in the present paper and elsewhere. The head-capacity characteristics, losses and efficiency, are discussed in the light
of visual evidence available from high speed motion pictures of the relative and absolute flow. The dominant influence of the inlet angle on the impeller performance is demonstrated
