本文選題：非光滑形態(tài) + 渦流發(fā)生器��； 參考：《中國機械工程》2016年07期

【摘要】：探討了將表面非光滑形態(tài)結(jié)構(gòu)減阻思想與流場主動控制相結(jié)合的車身氣動減阻方法。將凹坑型非光滑表面布置在MIRA直背式模型的尾部,并在非光滑形態(tài)模型的基礎上,在凹坑陣中加裝噴射速度可變的渦流發(fā)生器來控制模型的尾部氣流,改善尾渦結(jié)構(gòu)。通過對光滑、非光滑、非光滑加渦流噴射三種模型的三維流場數(shù)值模擬,得到不同尾部形態(tài)模型的氣流速度、壓力以及湍動能等參數(shù),對比不同風速下不同模型氣動阻力系數(shù)的差異以及不同噴射速度下的減阻效果,分析模型尾部流場參數(shù)的變化,闡述了非光滑形態(tài)車身氣動減阻機理以及渦流噴射擾動效應。研究結(jié)果表明:通過對非光滑形態(tài)被動減阻與渦流噴射主動減阻的優(yōu)化組合,能有效地減少不同風速下直背式MIRA模型的氣動阻力。
[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.
【作者單位】： 湖南大學汽車車身先進設計制造國家重點實驗室;
【基金】：國家自然科學基金資助項目(51375155) 湖南省自然科學基金資助項目(13JJ3041)
【分類號】：U463.82

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