Aerodynamic Characterization of Bullet Heads with Different Arcuate Curves

IF 1.1 4区工程技术 Q4 MECHANICS

Journal of Applied Fluid Mechanics Pub Date : 2024-05-01 DOI:10.47176/jafm.17.05.2333

B. Hao, Q. Jiang, C. Xu, L. Liu

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Abstract

The bullet shape is critical in efficient bullet design because it affects the lift and drag forces. This paper proposes a new bullet shape with a logarithmic curve and analyzes the lift and drag coefficients of bullets with different curves under different angles of attack. The results are compared with a bullet whose shape is described by the power law curve. Fluent simulations demonstrate that the optimal power exponent values are 0.65, 0.6, and 0.65 for the bullet with the power law curve and 1.3, 1, and 1 for the bullet with the logarithmic curve at 0°, 30°, and 40° angles of attack, respectively. At a 0° angle of attack, the lift coefficient of the logarithmic curve is the largest. The lift force of the bullet with the logarithmic curve is 129.4% higher than that with the von Karman curve. The drag coefficient is the largest for the bullet with the rectilinear curve; it is 1.30% larger than that of the bullet with the logarithmic curve. At 30° and 40° angles of attack, the lift coefficient of the bullet with the power law curve is larger. The difference in the lift coefficients between the two angles of attack is 18.47%. The bullet’s drag coefficient is the largest for the logarithmic curve, and the difference in the drag coefficients between the two angles of attack is 18.59%.

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具有不同弧形曲线的弹头的气动特性分析

子弹形状对有效的子弹设计至关重要，因为它会影响升力和阻力。本文提出了一种新的对数曲线子弹形状，并分析了不同攻角下不同曲线子弹的升力和阻力系数。结果与幂律曲线描述形状的子弹进行了比较。流体模拟表明，在 0°、30° 和 40°攻角下，幂律曲线子弹的最佳功率指数值分别为 0.65、0.6 和 0.65，对数曲线子弹的最佳功率指数值分别为 1.3、1 和 1。在 0° 攻角时，对数曲线的升力系数最大。采用对数曲线的子弹升力比采用 von Karman 曲线的子弹升力高 129.4%。直线曲线子弹的阻力系数最大，比对数曲线子弹的阻力系数大 1.30%。在 30° 和 40° 攻角时，幂律曲线子弹的升力系数更大。两个攻角的升力系数相差 18.47%。对数曲线的子弹阻力系数最大，两个攻角的阻力系数相差 18.59%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Applied Fluid Mechanics THERMODYNAMICS-MECHANICS

CiteScore

2.00

自引率

20.00%

发文量

138

审稿时长

>12 weeks

期刊介绍： The Journal of Applied Fluid Mechanics (JAFM) is an international, peer-reviewed journal which covers a wide range of theoretical, numerical and experimental aspects in fluid mechanics. The emphasis is on the applications in different engineering fields rather than on pure mathematical or physical aspects in fluid mechanics. Although many high quality journals pertaining to different aspects of fluid mechanics presently exist, research in the field is rapidly escalating. The motivation for this new fluid mechanics journal is driven by the following points: (1) there is a need to have an e-journal accessible to all fluid mechanics researchers, (2) scientists from third- world countries need a venue that does not incur publication costs, (3) quality papers deserve rapid and fast publication through an efficient peer review process, and (4) an outlet is needed for rapid dissemination of fluid mechanics conferences held in Asian countries. Pertaining to this latter point, there presently exist some excellent conferences devoted to the promotion of fluid mechanics in the region such as the Asian Congress of Fluid Mechanics which began in 1980 and nominally takes place in one of the Asian countries every two years. We hope that the proposed journal provides and additional impetus for promoting applied fluids research and associated activities in this continent. The journal is under the umbrella of the Physics Society of Iran with the collaboration of Isfahan University of Technology (IUT) .