Passing-over leading-edge vortex: The thrust booster in heaving airfoil
The thrust generated by heaving airfoil in incompressible flow is studied both numerically and theoretically. It is found that the behaviors of leading-edge vortex (LEV) under different airfoil’s transverse velocities have an important influence on the thrust. When this velocity is small, the LEV is...
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| Published in | AIP advances Vol. 9; no. 3; pp. 035314 - 035314-15 |
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| Main Authors | , , , |
| Format | Journal Article |
| Language | English |
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American Institute of Physics
01.03.2019
AIP Publishing LLC |
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| Abstract | The thrust generated by heaving airfoil in incompressible flow is studied both numerically and theoretically. It is found that the behaviors of leading-edge vortex (LEV) under different airfoil’s transverse velocities have an important influence on the thrust. When this velocity is small, the LEV is advected downstream regularly; however, as transverse velocity increases, the LEV can be pushed back to the leading edge again and pass over it to the opposite side of the airfoil. In cases with the LEV passing over the leading edge, the maximum transient thrust can be enhanced by several times compared with that in the single-stroke motion. The reason and critical condition for the occurrence of passing-over leading-edge vortex (PO-LEV) are found. Based on the source of the pressure Poisson equation, a near-field force theory is developed and used together with the boundary vorticity flux (BVF) theory to clarify the thrust enhancement mechanisms. |
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| AbstractList | The thrust generated by heaving airfoil in incompressible flow is studied both numerically and theoretically. It is found that the behaviors of leading-edge vortex (LEV) under different airfoil’s transverse velocities have an important influence on the thrust. When this velocity is small, the LEV is advected downstream regularly; however, as transverse velocity increases, the LEV can be pushed back to the leading edge again and pass over it to the opposite side of the airfoil. In cases with the LEV passing over the leading edge, the maximum transient thrust can be enhanced by several times compared with that in the single-stroke motion. The reason and critical condition for the occurrence of passing-over leading-edge vortex (PO-LEV) are found. Based on the source of the pressure Poisson equation, a near-field force theory is developed and used together with the boundary vorticity flux (BVF) theory to clarify the thrust enhancement mechanisms. |
| Author | Zou, Shu-Fan Gao, An-Kang Shi, Yipeng Wu, J. Z. |
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| CODEN | AAIDBI |
| CitedBy_id | crossref_primary_10_1063_5_0209169 crossref_primary_10_3390_aerospace10070615 crossref_primary_10_1063_5_0196040 crossref_primary_10_1017_jfm_2023_735 crossref_primary_10_1007_s42235_024_00522_6 crossref_primary_10_1007_s10409_019_00896_5 crossref_primary_10_1063_5_0160878 crossref_primary_10_1063_5_0137949 crossref_primary_10_1016_j_ijmultiphaseflow_2024_104899 crossref_primary_10_1063_5_0046996 |
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| SubjectTerms | Aerodynamics Computational fluid dynamics Fluid flow Heaving Incompressible flow Poisson equation Thrust Vortices Vorticity |
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| Title | Passing-over leading-edge vortex: The thrust booster in heaving airfoil |
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