Tail shape determination for foil profile

Abstract

Object and purpose of research. This paper discusses mitigation of vortex shedding from the trailing edge of foil profile and, accordingly, of alternating-sign unsteady forces through modification of foil geometry. Materials and methods. Theoretical calculations for perfect fluid, numerical simulation in viscous incompressible fluid, cavitation tunnel tests of conventional thruster-type foils and the foils with modified profile. Main results. The study yielded hydrodynamic parameters (lift and resistance coefficients) for the profiles under investigation. The tests also yielded cavitation data. As a result, it was possible to compare lift and resistance coefficients of conventional and modified profiles as per theoretical estimates and test data. Conclusion. Analysis of the changes in hydrodynamic parameters has shown that the method suggested by the authors is quite efficient and it is practicable to perform further tests with propeller.