Abstract
Abstract There is currently a significant focus on using boundary layer control (BLC) approach for controlling the flow around bodies, especially the foil sections. In marine engineering this is done with the hope of increasing the lift - to - drag ratio and efficiency of the hydrofoils. In this paper, effects of the method on hydrodynamic characteristics and tip vortex formation of a hydrofoil are studied. Steady water injection at the tip of the hydrofoil is simulated in different conditions by using ANSYS-CFX commercial software. Validity of the proposed simulations is verified by comparing the obtained results against available experimental data. Effects of the injection on the lift, drag, and lift - to - drag ratio are studied and the ranges within which the injection has the most positive or negative effects, are determined. Furthermore, flow pattern and pressure variation are studied upon the water injection to determine the most positive and negative case and to ascertain the main reasons triggering these phenomena.
Highlights
In the previous studies related to the characteristics of aerofoils and hydrofoils, researchers have highlighted different three-dimensional phenomena affecting aerofoil efficiency
The problem analysed in the current study is related to a NACA0015 foil with the aspect ratio of 3 and TR of 1 and 0.7
Two angles of attack : α = 6.5 and 17 degrees are taken into account
Summary
In the previous studies related to the characteristics of aerofoils and hydrofoils, researchers have highlighted different three-dimensional phenomena affecting aerofoil efficiency. In the present and following subsections, the effect of the injected fluid on the flow pattern and pressure coefficient distribution around the hydrofoil is investigated.
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