Fluid forces on a very low Reynolds number airfoil and their prediction

Y. Zhou; Md Mahbub Alam; H. X. Yang; H. Guo; D. H. Wood

doi:10.1016/j.ijheatfluidflow.2010.07.008

Fluid forces on a very low Reynolds number airfoil and their prediction

Y. Zhou^*
, Md Mahbub Alam
, H. X. Yang
, H. Guo
, D. H. Wood

^*Corresponding author for this work

Hong Kong Polytechnic University
University of Pretoria
Beihang University
University of Newcastle
University of Calgary

Research output: Contribution to journal › Article › peer-review

65 Scopus citations

Abstract

This paper presents the measurements of mean and fluctuating forces on an NACA0012 airfoil over a large range of angle (α) of attack (0-90°) and low to small chord Reynolds numbers (Re_c), 5.3×10³-5.1×10⁴, which is of both fundamental and practical importance. The forces, measured using a load cell, display good agreement with the estimate from the LDA-measured cross-flow distributions of velocities in the wake based on the momentum conservation. The dependence of the forces on both α and Re_c is determined and discussed in detail. It has been found that the stall of an airfoil, characterized by a drop in the lift force and a jump in the drag force, occurs at Re_c≥1.05×10⁴ but is absent at Re_c=5.3×10³. A theoretical analysis is developed to predict and explain the observed dependence of the mean lift and drag on α.

Original language	English
Pages (from-to)	329-339
Number of pages	11
Journal	International Journal of Heat and Fluid Flow
Volume	32
Issue number	1
DOIs	https://doi.org/10.1016/j.ijheatfluidflow.2010.07.008
State	Published - Feb 2011
Externally published	Yes

Keywords

Aerodynamics of airfoil
Low Reynolds number airfoil
Reynolds number effect
Stall of airfoil

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10.1016/j.ijheatfluidflow.2010.07.008

Cite this

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title = "Fluid forces on a very low Reynolds number airfoil and their prediction",

abstract = "This paper presents the measurements of mean and fluctuating forces on an NACA0012 airfoil over a large range of angle (α) of attack (0-90°) and low to small chord Reynolds numbers (Rec), 5.3×103-5.1×104, which is of both fundamental and practical importance. The forces, measured using a load cell, display good agreement with the estimate from the LDA-measured cross-flow distributions of velocities in the wake based on the momentum conservation. The dependence of the forces on both α and Rec is determined and discussed in detail. It has been found that the stall of an airfoil, characterized by a drop in the lift force and a jump in the drag force, occurs at Rec≥1.05×104 but is absent at Rec=5.3×103. A theoretical analysis is developed to predict and explain the observed dependence of the mean lift and drag on α.",

keywords = "Aerodynamics of airfoil, Low Reynolds number airfoil, Reynolds number effect, Stall of airfoil",

author = "Y. Zhou and Alam, \{Md Mahbub\} and Yang, \{H. X.\} and H. Guo and Wood, \{D. H.\}",

year = "2011",

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doi = "10.1016/j.ijheatfluidflow.2010.07.008",

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AU - Zhou, Y.

AU - Alam, Md Mahbub

AU - Yang, H. X.

AU - Guo, H.

AU - Wood, D. H.

PY - 2011/2

Y1 - 2011/2

N2 - This paper presents the measurements of mean and fluctuating forces on an NACA0012 airfoil over a large range of angle (α) of attack (0-90°) and low to small chord Reynolds numbers (Rec), 5.3×103-5.1×104, which is of both fundamental and practical importance. The forces, measured using a load cell, display good agreement with the estimate from the LDA-measured cross-flow distributions of velocities in the wake based on the momentum conservation. The dependence of the forces on both α and Rec is determined and discussed in detail. It has been found that the stall of an airfoil, characterized by a drop in the lift force and a jump in the drag force, occurs at Rec≥1.05×104 but is absent at Rec=5.3×103. A theoretical analysis is developed to predict and explain the observed dependence of the mean lift and drag on α.

AB - This paper presents the measurements of mean and fluctuating forces on an NACA0012 airfoil over a large range of angle (α) of attack (0-90°) and low to small chord Reynolds numbers (Rec), 5.3×103-5.1×104, which is of both fundamental and practical importance. The forces, measured using a load cell, display good agreement with the estimate from the LDA-measured cross-flow distributions of velocities in the wake based on the momentum conservation. The dependence of the forces on both α and Rec is determined and discussed in detail. It has been found that the stall of an airfoil, characterized by a drop in the lift force and a jump in the drag force, occurs at Rec≥1.05×104 but is absent at Rec=5.3×103. A theoretical analysis is developed to predict and explain the observed dependence of the mean lift and drag on α.

KW - Aerodynamics of airfoil

KW - Low Reynolds number airfoil

KW - Reynolds number effect

KW - Stall of airfoil

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DO - 10.1016/j.ijheatfluidflow.2010.07.008

M3 - 文章

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EP - 339

JO - International Journal of Heat and Fluid Flow

JF - International Journal of Heat and Fluid Flow

IS - 1

ER -

Fluid forces on a very low Reynolds number airfoil and their prediction

Abstract

Keywords

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