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The Effect of Boattail Angles on the Near-Wake Structure of Axisymmetric Afterbody Models at Low-Speed Condition
Author
Source
International Journal of Aerospace Engineering
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-14, 14 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-08-17
Country of Publication
Egypt
No. of Pages
14
Abstract EN
The effect of a boattail angle on the structure of the wake of an axisymmetric model was investigated at low-speed condition.
Four conical boattail models with angles of 0° (blunt-based body), 10°, 16°, and 22° were selected for this study.
The Reynolds number based on the diameter of the model was around 1.97×104.
Particle image velocimetry (PIV) was used to measure the velocity of the wake flow.
The time-averaged flow characteristics including the length of recirculation of the afterbody, turbulent intensity, and Reynolds shear stress were analyzed and compared among those boattail models.
The experimental results showed that the length of recirculation decreases with increasing boattail angle to 16°.
At a boattail angle above 16°, the flow was fully separated near the shoulder and near-wake structure was highly changed.
The turbulent intensity at a boattail angle of 22° showed a similar level to that in the case of the blunt-based body.
Flow behavior on boattail surface should be accounted as an important parameter affecting the wake width and drag of the model.
Power spectral density and proper orthogonal decomposition (POD) analyses showed that a Strouhal number of StD=0.2 dominated for the boattail model up to 16°.
The fully separated flow was dominated by a Strouhal number of StD=0.03−0.06, which was firstly presented in this study.
American Psychological Association (APA)
Tran, The Hung. 2020. The Effect of Boattail Angles on the Near-Wake Structure of Axisymmetric Afterbody Models at Low-Speed Condition. International Journal of Aerospace Engineering،Vol. 2020, no. 2020, pp.1-14.
https://search.emarefa.net/detail/BIM-1168199
Modern Language Association (MLA)
Tran, The Hung. The Effect of Boattail Angles on the Near-Wake Structure of Axisymmetric Afterbody Models at Low-Speed Condition. International Journal of Aerospace Engineering No. 2020 (2020), pp.1-14.
https://search.emarefa.net/detail/BIM-1168199
American Medical Association (AMA)
Tran, The Hung. The Effect of Boattail Angles on the Near-Wake Structure of Axisymmetric Afterbody Models at Low-Speed Condition. International Journal of Aerospace Engineering. 2020. Vol. 2020, no. 2020, pp.1-14.
https://search.emarefa.net/detail/BIM-1168199
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1168199