In this research, we implement a novel type of experimental apparatus for unsteady aerodynamics, which we call the Cyber Physical Fluid Dynamics (CPFD) Facility. Unlike traditional fluid mechanics experiments, CPFD is a general purpose technique that allows one to impose arbitrary forces on an object submerged in a fluid. We examine how the propulsive performance of an oscillating airfoil is improved by the addition of passive dynamics; in this case using active heave and passive pitch. The passive pitching allows the airfoil to produce up to an order of magnitude more thrust as compared to heave alone. In a further study, we are interested in self propulsion of a heaving and pitching airfoil. We employ a force feedback technique to simulate true self propulsion. The pitch plays a crucial role in controlling the instantaneous angle of attack. In fact, the most efficient operating point is one where the angle of attack is as high as possible, but just prior to airfoil stall. Reducing or removing flow separation and the formation of a leading edge vortex (LEV) corresponds to maximum efficiency and a maximum performance of the airfoil as a propulsor.
Fluid-Structure Interactions Employing Cyber-Physical Fluid Dynamics
2019
115 pages
Report
No indication
English
Fluid Mechanics , Strouhal number , Flow separation , Energy , Leading edges , Fluid dynamics , Reynolds number , Environmental monitoring , Pressure distribution , Search and rescue , Actuators , Efficiency , Feedback , Self propelled , Underwater vehicles , Vortex shedding , Vortices , Energy storage , Fluid flow , Cpfd(cyber-physical fluid dynamics) , Oscillating , Passive dynamics , Airfoil , Pitch , Heave , Distinct resonance peaks , Thrust coefficient , Lev(leadingedgevortex)
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