【摘要】：近年來,微型飛行器(Micro Air Vehicles, MAVs)因其在軍/民用領(lǐng)域廣泛的潛在應(yīng)用價(jià)值而受到了科學(xué)家們越來越多的關(guān)注。研究表明,當(dāng)雷諾數(shù)降低時(shí),高雷諾數(shù)下適用于宏觀飛行器的流線型翼型的氣動性能急劇惡化。因而,適用于MAVs的高效翼型亟待發(fā)展。蜻蜓既適合滑翔又適合懸停飛行的褶皺翼型是一個(gè)很好的備選翼型。為了研究彎度改變對褶皺翼型氣動特性的影響,受有彎度NACA翼型的啟發(fā),通過給常規(guī)褶皺翼型附加彎度,構(gòu)造出有彎度褶皺翼型,并采用二階插值格式的格子Boltzmann方法對其進(jìn)行研究。對于滑翔飛行,數(shù)值結(jié)果表明,彎度增大,褶皺翼型升阻力均隨之增大。小攻角下,彎度對褶皺翼型的氣動特性影響相對較小,然而,流動充分分離時(shí),彎度可以顯著改善褶皺翼型的氣動特性。對于懸停飛行,數(shù)值結(jié)果表明,對于本研究涉及的任何拍動幅值和軌跡,彎度增加,力的正負(fù)峰值之間的幅度都會稍稍增大。當(dāng)彎度改變時(shí),拍動幅度越大,翼型受益越大。不同的拍動軌跡按其從彎度改變所獲的收益大小按從小到大的順序依次為：橢圓、雙“8”字、直線和“8”字軌跡。
[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.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：V211.41

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本文編號：2188453