Flapping membranes for thrust production

J. M. Jiménez; J. H.J. Buchholz; A. E. Staples; J. J. Allen; A. J. Smits

doi:10.1007/978-94-007-0995-9_6

Flapping membranes for thrust production

J. M. Jiménez, J. H.J. Buchholz, A. E. Staples, J. J. Allen, A. J. Smits

Mechanical & Aerospace Engineering

Research output: Chapter in Book/Report/Conference proceeding › Chapter

1 Scopus citations

Abstract

The wake of a flexible flapping membrane has been investigated using flow visualization and particle image velocimetry. The aspect ratio of the flexible membrane was 0.27. The Strouhal number (St) was varied from 0.44 to 0.16, corresponding to Reynolds numbers between 2.2 × 10 ⁵ and 4.1×10 ⁵. Under these conditions, a wake structure was observed that resembles the 2P structure characteristic of flapping foils but containing at least four vortex pairs per cycle. For St ≥ 0.35, vorticity contour plots suggest that each multiple vortex pair structure has approximately zero net circulation; whereas for lower St, vorticity of one sign is diminished such that the wake begins to resemble the classical von Kármán vortex street. A mean wake velocity profile measured at the mid-span of the membrane suggests a net drag for all flow conditions considered, with the minimum drag occurring for St = 0.35. However, preliminary flow visualization experiments with an increased aspect ratio of 0.45 show a simpler 2S-type structure resembling a reverse von Kármán vortex street for which greater efficiency in thrust production is expected.

Original language	English (US)
Title of host publication	IUTAM Symposium on Integrated Modeling of Fully Coupled Fluid Structure Interactions Using Analysis, Computations and Experiments
Editors	HAYM BENAROYA, TIMOTHY WEI
Pages	115-124
Number of pages	10
DOIs	https://doi.org/10.1007/978-94-007-0995-9_6
State	Published - 2004

Publication series

Name	Fluid Mechanics and its Applications
Volume	75
ISSN (Print)	0926-5112

All Science Journal Classification (ASJC) codes

Mechanics of Materials
Mechanical Engineering
Fluid Flow and Transfer Processes

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10.1007/978-94-007-0995-9_6

Cite this

Jiménez, J. M., Buchholz, J. H. J., Staples, A. E., Allen, J. J., & Smits, A. J. (2004). Flapping membranes for thrust production. In HAYM. BENAROYA, & TIMOTHY. WEI (Eds.), IUTAM Symposium on Integrated Modeling of Fully Coupled Fluid Structure Interactions Using Analysis, Computations and Experiments (pp. 115-124). (Fluid Mechanics and its Applications; Vol. 75). https://doi.org/10.1007/978-94-007-0995-9_6

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abstract = "The wake of a flexible flapping membrane has been investigated using flow visualization and particle image velocimetry. The aspect ratio of the flexible membrane was 0.27. The Strouhal number (St) was varied from 0.44 to 0.16, corresponding to Reynolds numbers between 2.2 × 10 5 and 4.1×10 5. Under these conditions, a wake structure was observed that resembles the 2P structure characteristic of flapping foils but containing at least four vortex pairs per cycle. For St ≥ 0.35, vorticity contour plots suggest that each multiple vortex pair structure has approximately zero net circulation; whereas for lower St, vorticity of one sign is diminished such that the wake begins to resemble the classical von K{\'a}rm{\'a}n vortex street. A mean wake velocity profile measured at the mid-span of the membrane suggests a net drag for all flow conditions considered, with the minimum drag occurring for St = 0.35. However, preliminary flow visualization experiments with an increased aspect ratio of 0.45 show a simpler 2S-type structure resembling a reverse von K{\'a}rm{\'a}n vortex street for which greater efficiency in thrust production is expected.",

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Jiménez, JM, Buchholz, JHJ, Staples, AE, Allen, JJ & Smits, AJ 2004, Flapping membranes for thrust production. in HAYM BENAROYA & TIMOTHY WEI (eds), IUTAM Symposium on Integrated Modeling of Fully Coupled Fluid Structure Interactions Using Analysis, Computations and Experiments. Fluid Mechanics and its Applications, vol. 75, pp. 115-124. https://doi.org/10.1007/978-94-007-0995-9_6

Flapping membranes for thrust production. / Jiménez, J. M.; Buchholz, J. H.J.; Staples, A. E. et al.
IUTAM Symposium on Integrated Modeling of Fully Coupled Fluid Structure Interactions Using Analysis, Computations and Experiments. ed. / HAYM BENAROYA; TIMOTHY WEI. 2004. p. 115-124 (Fluid Mechanics and its Applications; Vol. 75).

Research output: Chapter in Book/Report/Conference proceeding › Chapter

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AU - Jiménez, J. M.

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Flapping membranes for thrust production

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