Thrust Generation and Wake Structure of a Wiggling Hydrofoil

HE Guo-yi; ZHANG Shu-guang; ZHANG Xing

doi:10.3879/j.issn.1000-0887.2010.05.006

Volume 31 Issue 5

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HE Guo-yi, ZHANG Shu-guang, ZHANG Xing. Thrust Generation and Wake Structure of a Wiggling Hydrofoil[J]. Applied Mathematics and Mechanics, 2010, 31(5): 553-560. doi: 10.3879/j.issn.1000-0887.2010.05.006

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Thrust Generation and Wake Structure of a Wiggling Hydrofoil

doi: 10.3879/j.issn.1000-0887.2010.05.006

The School of Aircraft Engineering, Nanchang Hangkong University, Nanchang 330063, P. R. China;
The School of Aeronautic Science and Engineering, Beihang University, Beijng 100191, P. R. China;
The School of Transport Science and Engineering, Beihang University, Beijing 100191, P. R. China;
LNM, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, P. R. China

Received Date: 1900-01-01
Rev Recd Date: 2010-04-06
Publish Date: 2010-05-15

Abstract

Abstract

A wiggling motion is often used by marine anmials and micro-machines to generate thrust. The wiggling motion can be modeled by aprogressive wave where its wavelength describes the flexibility of wiggling anmials. In the present study, animmersed boundary method was used to smiulate the flows around the wiggling hydrofoil NACA-65-010 at low Reynolds numbers. It is found from the numerical s im ulations that the thrust generation is largely determined by the wave length: The thrust coefficients decrease with increasing the wavelength while the propulsive efficiency reaches maxmium at acertain wave length. The latter is due to the viscous effects. The thrust generation is associated with two different flow patterns in the wake: the well-known reversed Krmn vortex streets and the vortex dipoles. Both of them are jettype flows where the thrust coefficients associated with the reversed Krmn vortex streets are larger than the ones associated with vortex diploes.
- propulsive performance,
- wiggling motion,
- wake,
- immersed boundary method

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References(25)

References

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