Numerical simulation of the unsteady cavitation behavior of an inducer blade cascade
Résumé
One source of unsteadiness in turbopump inducers consists in a rotating cavitation behavior, characterized
by different cavity shapes on the different blades, which leads to super- or subsynchronous disturbances. This
phenomenon is simulated for the case of a simple two-dimensional blade cascade corresponding to a typical fourblade
inducer. A numerical model of unsteady cavitating flows was adapted to take into account nonmatching
connections and periodicity conditions. Single-channel and four-channel computations were performed, and in the
latter case, nonsymetrical unstable flow patterns were obtained. Limits of stability according to the mass flow rate
and the cavitation number are presented. Qualitative comparisons with experiments, instability criterion, and the
mechanisms of instabilities are also investigated.
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