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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Vortex force of an impulsively started plate at high angle of attack
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Vortex force of an impulsively started plate at high angle of attack

机译：冲激板在高攻角下的涡力

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Purpose - A quantitative study that can identify the primary aerodynamic forces and relate them to individual vortical structures is lacking. The paper aims to clarify the quantitative relationships between the aerodynamic forces and vortical structures. Design/methodology/approach - The various contributions to the aerodynamic forces on the twodimensional impulsively started plate are investigated from the perspective of the vorticity moment theorem. The angles of attacks are set to 45°, 58.5° and 72°, while the Reynolds number is 10,000 based on the chord length. Compared with the traditional pressure force analysis, this theorem not only tells us the total aerodynamic force during the motion, but also enables us to quantify the forces contributed from the fluid elements with non-zero vorticity. Findings - It is found that the time-dependent force behaviors are dominated by the formations and evolutions of these vortical structures. The analysis of the time-averaged forces demonstrates that the lift contributed from the leading edge vortex (LEV) is nearly four times larger than the total lift and the drag contributed from the starting vortex (SV) is almost equal to the total drag when the angle of attack (AoA) increases to 72°, which means the LEV is "lift structure" whereas the SV is "drag structure". Practical implications - The present method provides a better perspective for flow control and drag reduction by relating the forces directly to the individual vorticity structures. Originality/value - In this paper, the Vorticity Moment Theory is first used to study the quantitative relationships between the aerodynamic forces and the vortices.
机译：目的-缺乏能够识别主要空气动力并将其与单个涡旋结构相关联的定量研究。本文旨在阐明空气动力与旋涡结构之间的定量关系。设计/方法/方法-从涡旋矩定理的角度研究了对二维脉冲启动板上空气动力的各种贡献。迎角设置为45°，58.5°和72°，而雷诺数基于弦长为10,000。与传统的压力分析相比，该定理不仅告诉我们运动过程中的总空气动力，而且使我们能够以非零涡度量化由流体元素贡献的力。发现-发现随时间变化的力行为受这些旋涡结构的形成和演化支配。对时间平均力的分析表明，前缘涡流（LEV）贡献的升力几乎是总升力的四倍，而起始涡流（SV）贡献的阻力几乎等于总阻力。迎角（AoA）增加到72°，这意味着LEV是“升力结构”，而SV是“阻力结构”。实际意义-通过将力直接与各个涡旋结构相关联，本方法为流量控制和减阻提供了更好的视角。独创性/价值-在本文中，涡度矩理论首先用于研究空气动力和涡旋之间的定量关系。

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