Effect of boattail angle on near-wake flow and drag of axisymmetric models: a numerical approach

Abstract

Flow behavior around axisymmetric boattail surface was studied by numerical methods. A wide range of boattail angles from 0° to 24° was investigated to find the drag trend of the model. Numerical simulation was validated by experimental results with the same flow conditions. Results showed that the use of boattail model always has a positive effect on drag reduction. Total drag showed minimum value at boattail model of around 14°. Length of the recirculation after body decreases with increasing boattail angle up to 14° and then becomes constant at higher angle. The trend of boattail pressure drag showed similar to previous studies for high-speed flow. However, base drag showed different trend to previous observation. The base drag showed to be the most important parameter to determine drag trend of the model. The effect of flow fields around boattail on pressure distribution and drag is discussed in detail.

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Acknowledgments

The authors thank Professor Keisuke Asai and Professor Taku Nonomura at Department of Aerospace Engineering, Tohoku University in Japan for their support during the experimental process.

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Correspondence to The Hung Tran.

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The Hung Tran is a lecturer at Faculty of Aerospace Engineering, Le Quy Don Technical University, Hanoi, Vietnam. He received his Ph.D. in Experimental Aerodynamics at Tohoku University, Japan in 2019. His research interests are numerical simulation, optical-flow and wind tunnel experiments.

Hoang Quan Dinh is a lecturer at Faculty of Aerospace Engineering, Le Quy Don Technical University, Hanoi, Vietnam. He received his Ph.D. at Moscow institute of Physics and Technology, Russian Federation in 2017. His research interests are numerical simulation, scientific computing, aerodynamics, fly engineering and wind tunnel experiments.

Hoang Quan Chu is a lecturer at the Faculty of Aerospace Engineering, Le Quy Don Technical University, Hanoi, Vietnam. He received his Master’s at ISAE SUPAERO, France in 2016. His research interests are aerodynamics, propulsion and fluid-structure interactions.

Van Quang Duong is a Doctoral researcher at Faculty of Aerospace Engineering, Le Quy Don Technical University, Hanoi, Viet Nam. He received his Master’s at Le Quy Don Technical University in 2017. His research interests are aerodynamic, aeroelasticity and aircraft structural.

Chung Pham is a lecturer at Faculty of Aerospace Engineering, Le Quy Don Technical University, Hanoi, Vietnam. He received his Ph.D. at Moscow Aviation Institute, Russian in 2012. His research interests are numerical simulation, aircraft construction.

Van Minh Do is the lecturer at Faculty of Special Equipments, Le Quy Don Technical University, Hanoi, Vietnam. He received his Ph.D. in Engineering Sciences at National University of Science and Technology MISiS, Russia in 2015. His research interests are numerical simulation, high velocity impact dynamics.

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Tran, T.H., Dinh, H.Q., Chu, H.Q. et al. Effect of boattail angle on near-wake flow and drag of axisymmetric models: a numerical approach. J Mech Sci Technol 35, 563–573 (2021). https://doi.org/10.1007/s12206-021-0115-1

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Keywords

  • Boattail angle
  • Base drag
  • Boattail pressure drag
  • Free-levitation test