An Analysis of Unsteady Diagonal Cascade Flow Using a Discrete Vortex Method

概要

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A numerical method for solving the unsteady two-dimensional incompressible flows through a cascade of the diagonal turbomachine is developed by using a discrete vortex method, based on the previous paper. In the discrete vortex method, "point vortices" are not singularities in the existing method but ones introduced only as calculating points on the Lagrangian coordinates. By the method a reasonably smooth distribution of vorticity on the Eulerian mesh can be obtained using relatively a few point vortices. The present method is applicable to an unsteady cascade flow in the water turbine runner subjected to the wakes from the guide vanes in which the distribution of vorticities is complicated.
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