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本文介绍了细长体大迎角无侧滑时不对称涡系形成机理的初步探索结果。实验研究表明,不对称涡系的形成机理是:脱体涡受物面和位流边界影响,随着迎角增大,其强度和尺寸亦逐渐增加;当背风区宽度已不能容其自由发展时,左右两侧脱体涡便互相推挤,致使较弱的脱体涡被上推,形成了不对称的涡迹。 实验研究还表明不对称性的偶然性和必然性之间的辩证关系。对脱体涡在受到扰动和逆压后的情况亦作了相应的研究。所有实验是在常规低速风洞中进行的,实验雷诺数Re≈1×10~5。
This paper introduces the preliminary exploration results of the formation mechanism of asymmetric vortex when the slender body has a high angle of attack without slippage. Experimental results show that the formation mechanism of asymmetric vortex system is that the detachment vortex is influenced by the object surface and the boundary of the bit stream. As the angle of attack increases, its intensity and size also gradually increase. When the width of the leeward zone can not accommodate its free development , The left and right side of the body off the vortex will push each other, resulting in weak off the body vortex was pushed up to form an asymmetric vortex. Experimental studies also show the dialectical relationship between the chance and the inevitability of asymmetry. The off-vortex was also perturbed after perturbation and backpressure. All the experiments were carried out in a conventional low speed wind tunnel. The experimental Reynolds number Re≈1 × 10 ~ 5.