基于非光滑表面与涡流干扰的车身气动减阻方法

发布时间：2018-05-04 09:45

本文选题：非光滑形态 + 涡流发生器　；参考：《中国机械工程》2016年07期

【摘要】：探讨了将表面非光滑形态结构减阻思想与流场主动控制相结合的车身气动减阻方法。将凹坑型非光滑表面布置在MIRA直背式模型的尾部,并在非光滑形态模型的基础上,在凹坑阵中加装喷射速度可变的涡流发生器来控制模型的尾部气流,改善尾涡结构。通过对光滑、非光滑、非光滑加涡流喷射三种模型的三维流场数值模拟,得到不同尾部形态模型的气流速度、压力以及湍动能等参数,对比不同风速下不同模型气动阻力系数的差异以及不同喷射速度下的减阻效果,分析模型尾部流场参数的变化,阐述了非光滑形态车身气动减阻机理以及涡流喷射扰动效应。研究结果表明:通过对非光滑形态被动减阻与涡流喷射主动减阻的优化组合,能有效地减少不同风速下直背式MIRA模型的气动阻力。
[Abstract]:In this paper, the aerodynamic drag reduction method of vehicle body is discussed, which combines the drag reduction idea of non-smooth surface structure with active control of flow field. The non-smooth surface of the concave is arranged at the tail of the MIRA straight back model. On the basis of the non-smooth shape model, a swirl generator with variable jet velocity is added to the concave array to control the tail flow of the model and to improve the structure of the wake vortex. Through the numerical simulation of the three models of smooth, non-smooth, non-smooth and swirl jet, the parameters of the flow velocity, pressure and turbulent kinetic energy of different tail shape models are obtained. By comparing the difference of aerodynamic drag coefficient under different wind speed and the drag reduction effect of different injection velocity, the variation of model tail flow field parameters is analyzed, and the aerodynamic drag reduction mechanism and eddy current jet disturbance effect of non-smooth body are expounded. The results show that by optimizing the combination of non-smooth passive drag reduction and eddy current jet active drag reduction, the aerodynamic resistance of the straight-back MIRA model can be effectively reduced under different wind speeds.
【作者单位】：湖南大学汽车车身先进设计制造国家重点实验室;
【基金】：国家自然科学基金资助项目(51375155) 湖南省自然科学基金资助项目(13JJ3041)
【分类号】：U463.82

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