弯度对褶皱翼型滑翔和悬停气动性能影响的研究
发布时间：2018-08-17 18:03
【摘要】：近年来,微型飞行器(Micro Air Vehicles, MAVs)因其在军/民用领域广泛的潜在应用价值而受到了科学家们越来越多的关注。研究表明,当雷诺数降低时,高雷诺数下适用于宏观飞行器的流线型翼型的气动性能急剧恶化。因而,适用于MAVs的高效翼型亟待发展。蜻蜓既适合滑翔又适合悬停飞行的褶皱翼型是一个很好的备选翼型。为了研究弯度改变对褶皱翼型气动特性的影响,受有弯度NACA翼型的启发,通过给常规褶皱翼型附加弯度,构造出有弯度褶皱翼型,并采用二阶插值格式的格子Boltzmann方法对其进行研究。对于滑翔飞行,数值结果表明,弯度增大,褶皱翼型升阻力均随之增大。小攻角下,弯度对褶皱翼型的气动特性影响相对较小,然而,流动充分分离时,弯度可以显著改善褶皱翼型的气动特性。对于悬停飞行,数值结果表明,对于本研究涉及的任何拍动幅值和轨迹,弯度增加,力的正负峰值之间的幅度都会稍稍增大。当弯度改变时,拍动幅度越大,翼型受益越大。不同的拍动轨迹按其从弯度改变所获的收益大小按从小到大的顺序依次为：椭圆、双“8”字、直线和“8”字轨迹。
[Abstract]:In recent years, (Micro Air Vehicles, MAVs) has attracted more and more attention from scientists for its potential application in military / civilian applications. The results show that the aerodynamic performance of streamline airfoils suitable for macroscopical aircraft at high Reynolds number will deteriorate sharply when the Reynolds number is reduced. Therefore, the efficient airfoil suitable for MAVs is in urgent need of development. Dragonfly is a good alternative airfoil for gliding and hovering. In order to study the influence of curvature change on the aerodynamic characteristics of folded airfoil, a folded airfoil with curvature is constructed by adding the curvature to the conventional fold airfoil, inspired by the NACA airfoil with curvature. The lattice Boltzmann method of the second order interpolation scheme is used to study it. For gliding, the numerical results show that the lift resistance of the fold airfoil increases with the increase of curvature. At small angle of attack, the effect of curvature on aerodynamic characteristics of folded airfoil is relatively small. However, when the flow is fully separated, the curvature can significantly improve the aerodynamic characteristics of folded airfoil. For hovering flight the numerical results show that for any flapping amplitude and trajectory involved in this study the amplitude between positive and negative peaks of force increases slightly with the increase of curvature. When the curve changes, the larger the flapping amplitude, the greater the benefit of the airfoil. According to the change of curve, the order of different beat trajectory is: ellipse, double "8" word, straight line and "8" word locus.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：V211.41
本文编号：2188453
[Abstract]:In recent years, (Micro Air Vehicles, MAVs) has attracted more and more attention from scientists for its potential application in military / civilian applications. The results show that the aerodynamic performance of streamline airfoils suitable for macroscopical aircraft at high Reynolds number will deteriorate sharply when the Reynolds number is reduced. Therefore, the efficient airfoil suitable for MAVs is in urgent need of development. Dragonfly is a good alternative airfoil for gliding and hovering. In order to study the influence of curvature change on the aerodynamic characteristics of folded airfoil, a folded airfoil with curvature is constructed by adding the curvature to the conventional fold airfoil, inspired by the NACA airfoil with curvature. The lattice Boltzmann method of the second order interpolation scheme is used to study it. For gliding, the numerical results show that the lift resistance of the fold airfoil increases with the increase of curvature. At small angle of attack, the effect of curvature on aerodynamic characteristics of folded airfoil is relatively small. However, when the flow is fully separated, the curvature can significantly improve the aerodynamic characteristics of folded airfoil. For hovering flight the numerical results show that for any flapping amplitude and trajectory involved in this study the amplitude between positive and negative peaks of force increases slightly with the increase of curvature. When the curve changes, the larger the flapping amplitude, the greater the benefit of the airfoil. According to the change of curve, the order of different beat trajectory is: ellipse, double "8" word, straight line and "8" word locus.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：V211.41
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