Unsteady Total Head of a Centrifugal Impeller with Leading Edge Separation by a Discrete Vortex Method.

Abstract

Separated flow in a centrifugal impeller under the unsteady operating condition was examined by a discrete vortex method. Calculations were carried out in the case of impulsive change of the rotational speed at the instant τ=0 (τ : non-dimensional time) under a constant flow rate. Results shows that the total head rise of the impeller obtained from the unsteady Bernoulli equation responds quickly, and reaches to the final value before τ=1.