A theoretical model for the performance prediction of fully filled fluid couplings

Abstract A detailed performance prediction procedure, applicable fo fully filled fluid couplings is presented. In this procedure the fluid flow is considered to have two components; one circumferentially about the coupling axis, and the other passing fluid from the pump impeller to the turbine runner in the plane of the coupling axis. Whilst the procedure is essentially a one-dimensional analysis, a mean flow path approach is not used; instead the velocity component giving the circulation through each element is considered to increase linearly with distance from the mean radius R m . The inclusion of empirical specific energy losses into this flow model is described in detail and the full performance prediction compared with experimental results.