Jet Control of Flow Separation on Hydrofoils: PerformanceEvaluation Based on Force and Torque Measurements
2020
Operating characteristics of aeronautic and marine vehicles, as well
as hydraulic machines designed for various purposes are largely affected
by flow separation. Therefore, control of separated flows is an
extremely important problem for modern aviation and marine engineering.
Based on dynamometric measurements of forces and torque acting on model
hydrofoils and the ship rudder, jet control of flow separation in
cavitation-free and cavitation regimes at low and high angles of attack
is studied. It is shown that generation of a near-wall jet can ensure a
separationless flow around test models at angles of attack greater than
30 degrees. In this case, the lift coefficient of the hydrofoil can
increase approximately by two or three times. Pressure fluctuations near
the body and in its wake vanish due to flow stabilization; as a result,
oscillations of hydrodynamic loads on the body decrease.
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