Re-Entrant Jet Modelling of Partial Cavity Flow on Three-Dimensional Hydrofoils

摘要

A potential-based, lower-order surface panel method is developed to calculate the211u001eflow around a 3-dimensional with attached sheet cavity at the leading edge. A 211u001eDirichlet type dynamic boundary condition on the cavity surface and a Neumann 211u001eboundary condition on the wetted surface are enforced. The cavity shape is 211u001einitially assumed and the kinematic boundary condition on the cavity surface is 211u001esatisfied by iterating the cavity length and shape. Upon convergence, both the 211u001edynamic boundary condition and the kinematic boundary condition on the cavity 211u001esurface are satisfied, and a reentrant jet is automatically evolved. The flow at 211u001ethe end of the cavity and the mechanism of the reentrant jet formation is 211u001einvestigated. Qualitative comparisons are done between the calculations and the 211u001eMIT's experiments for a 3-D hydrofoil. Good agreements are shown.