Drag reduction for axisymmetric boattail model by longitudinal groove cavity under low-speed conditions

IF 1.5 4区工程技术 Q3 ENGINEERING, MECHANICAL Journal of Mechanical Science and Technology Pub Date : 2024-08-02 DOI:10.1007/s12206-024-0718-4

Dinh Quang Nguyen, The Hung Tran, Dinh Anh Le, Nguyen Tuan Hieu, Van Khiem Pham, Truong Sang Ha

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Abstract

The effect of longitudinal groove cavities on drag and flow behavior was investigated for the axisymmetric model acquired by different conical boattail models. The angle of the boattail was changed from 0 to 22° to understand the influence of cavities on the aerodynamic drag and flow behaviors. The Reynolds averaged Navier-Stokes (RANS) equation with turbulent model k-ω SST was used for the investigation. The simulation was conducted at a velocity of 22 m/s by Ansys Fluent software. Numerical results of the boundary layer, velocity fields, pressure, and drag were first validated by experiments at the same flow conditions. Our results indicate that the grooved cavity allows a reduction of aerodynamic drag up to 24 % for the boattail model of 22°. Additionally, a 6 % drag reduction was also observed for the boattail model of around 14°, where the drag is minimal. The decreasing drag is connected to an increasing base pressure, which is from shortening wake structure and increasing boattail pressure around the shoulder. The longitudinal grooves are found an effective passive control device for narrowing flow separation on the boattail. The details of pressure distributions, flow structure at the surface, and near-wake structure were investigated.

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低速条件下利用纵向槽腔减少轴对称船尾模型的阻力

研究了由不同锥形舟尾模型获得的轴对称模型的纵向沟槽空腔对阻力和流动行为的影响。为了解空腔对气动阻力和流动行为的影响，舟尾的角度从 0° 变为 22°。研究采用了雷诺平均纳维-斯托克斯（RANS）方程和 k-ω SST 湍流模型。模拟采用 Ansys Fluent 软件，速度为 22 米/秒。边界层、速度场、压力和阻力的数值结果首先通过相同流动条件下的实验进行了验证。我们的结果表明，对于 22° 的舟尾模型，开槽空腔可使气动阻力降低 24%。此外，在阻力最小的 14° 左右的船尾模型中，也观察到阻力减少了 6%。阻力的减小与基底压力的增加有关，基底压力的增加源于尾流结构的缩短和艇肩周围艇尾压力的增加。纵向沟槽被认为是一种有效的被动控制装置，可缩小艇尾上的水流分离。对压力分布、表面流动结构和近尾流结构的细节进行了研究。

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来源期刊

Journal of Mechanical Science and Technology 工程技术-工程：机械

CiteScore

2.90

自引率

6.20%

发文量

517

审稿时长

7.7 months

期刊介绍： The aim of the Journal of Mechanical Science and Technology is to provide an international forum for the publication and dissemination of original work that contributes to the understanding of the main and related disciplines of mechanical engineering, either empirical or theoretical. The Journal covers the whole spectrum of mechanical engineering, which includes, but is not limited to, Materials and Design Engineering, Production Engineering and Fusion Technology, Dynamics, Vibration and Control, Thermal Engineering and Fluids Engineering. Manuscripts may fall into several categories including full articles, solicited reviews or commentary, and unsolicited reviews or commentary related to the core of mechanical engineering.