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Determining the side force appearance and its magnitude over a slender body at high angle of attack

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Thermophysics and Aeromechanics Aims and scope

Abstract

One of the challenges, especially at low speeds, is the behavior of flow at high angles of attack, which usually leads to asymmetric separation of flows around slender bodies and increased side force. In this paper, a cylindrical cone is examined numerically. For this study, an asymmetric grid is used to capture this expected phenomenon. According to the results, the phenomenon of asymmetry does not occur until the angle of 20 degrees, and as the angle of attack increases, the asymmetry and consequently, the side force increases. At angles close to 90 degrees, the side force decreases significantly. Also, increasing the speed (increasing the Reynolds number and Mach number) reduces the effect of this phenomenon. A way to reduce the effect of this phenomenon is to change the geometry of the nose in a way that reduces its sensitivity to these instabilities and reduces side force. A blowing can also be used to control this phenomenon. Results show that bluntness and a parabolic nose prevents this phenomenon to some extent. A parabolic nose can reduce side force by about 40 %. By removing the sharp tip of the conical nose and adding blowing on blunt tip, the side force is reduced up to 37 % and 43 %, respectively.

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Abbreviations

C D :

Drag force coefficient, Drag force /(q∞·S)

C L :

Lift coefficient, Lift force/(q∞·S)

C Y :

Side force coefficient, Side force /(q∞·D)

d :

Blunt diameter

D :

Base diameter

L :

Total length

q ∞ :

Free-stream dynamic pressure

Re:

Reynolds number based on D

S :

Base Area

V :

Free-stream velocity

V B :

Blowing Velocity

x, y, z :

Body axes

α :

Angle of attack

θ :

Meridian angle, clockwise is positive looking upstream.

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  1. Amirkabir University of Technology, Tehran, Iran

    G. Hosseinzadeh Kamakoli & K. Mansour

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  1. G. Hosseinzadeh Kamakoli
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  2. K. Mansour
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Correspondence to K. Mansour.

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Kamakoli, G.H., Mansour, K. Determining the side force appearance and its magnitude over a slender body at high angle of attack. Thermophys. Aeromech. 28, 919–930 (2021). https://doi.org/10.1134/S0869864321060160

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  • DOI: https://doi.org/10.1134/S0869864321060160

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