Mechanisms Influencing the Efficiency of Oscillating Airfoil Propulsion
A NACA0012 airfoil undergoing pitching and plunging motion atRe = 20,000-40,000 was simulated using a two-dimensional Navier-Stokes flow solver. Results were compared with experimental measurements in the literature and those from an inviscid analytical method and an unsteady panel method code. Alth...
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| Veröffentlicht in: | AIAA journal 2007-07, Vol.45 (7), p.1695-1702 |
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| container_title | AIAA journal |
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| creator | Young, John Lai, Joseph C. S |
| description | A NACA0012 airfoil undergoing pitching and plunging motion atRe = 20,000-40,000 was simulated using a two-dimensional Navier-Stokes flow solver. Results were compared with experimental measurements in the literature and those from an inviscid analytical method and an unsteady panel method code. Although the peak in propulsive efficiency with Strouhal number demonstrated in the experimental results was predicted by the inviscid methods, it was found to be significantly modified by leading-edge vortex shedding and viscous drag at low Strouhal numbers. The occurrence and influence of vortex shedding is controlled by both the motion of the airfoil (amplitudes and phases of plunging and pitching) and the flapping frequency, which limits the time available for vortex formation and convection over the airfoil surface. Thus, Strouhal number alone is insufficient to characterize the efficiency of flapping-foil propulsion. [PUBLICATION ABSTRACT] |
| doi_str_mv | 10.2514/1.27628 |
| format | Article |
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Thus, Strouhal number alone is insufficient to characterize the efficiency of flapping-foil propulsion. [PUBLICATION ABSTRACT]</description><subject>Aerodynamics</subject><subject>Aircraft</subject><subject>Applied sciences</subject><subject>Computer science; control theory; systems</subject><subject>Control theory. 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Systems</topic><topic>Design engineering</topic><topic>Efficiency</topic><topic>Exact sciences and technology</topic><topic>Propellers</topic><topic>Robotics</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Young, John</creatorcontrib><creatorcontrib>Lai, Joseph C. S</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>AIAA journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Young, John</au><au>Lai, Joseph C. 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The occurrence and influence of vortex shedding is controlled by both the motion of the airfoil (amplitudes and phases of plunging and pitching) and the flapping frequency, which limits the time available for vortex formation and convection over the airfoil surface. Thus, Strouhal number alone is insufficient to characterize the efficiency of flapping-foil propulsion. [PUBLICATION ABSTRACT]</abstract><cop>Reston, VA</cop><pub>American Institute of Aeronautics and Astronautics</pub><doi>10.2514/1.27628</doi><tpages>8</tpages></addata></record> |
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| subjects | Aerodynamics Aircraft Applied sciences Computer science control theory systems Control theory. Systems Design engineering Efficiency Exact sciences and technology Propellers Robotics |
| title | Mechanisms Influencing the Efficiency of Oscillating Airfoil Propulsion |
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