本文選題：梯形翼尖帆片 + 橢圓翼尖帆片��； 參考：《實(shí)驗(yàn)流體力學(xué)》2016年06期

【摘要】：翼尖帆片將原型機(jī)翼集中的翼尖渦分散成多個(gè)小渦,加快翼尖渦的耗散,從而降低機(jī)翼誘導(dǎo)阻力。為進(jìn)一步了解翼尖帆片對(duì)機(jī)翼在地面效應(yīng)下流動(dòng)特性的影響,分別對(duì)安裝有3片橢圓形和梯形帆片的NACA4412機(jī)翼開(kāi)展了風(fēng)洞實(shí)驗(yàn)研究。測(cè)量了2種帆片機(jī)翼的氣動(dòng)力和翼尖渦結(jié)構(gòu),并通過(guò)比較流動(dòng)結(jié)構(gòu),分析了2種機(jī)翼氣動(dòng)力產(chǎn)生差異的原因。機(jī)翼的升、阻力用六分量盒式風(fēng)洞天平測(cè)量,翼尖渦速度分布用七孔探針掃描獲得,以機(jī)翼弦線(xiàn)為特征長(zhǎng)度的雷諾數(shù)為1.5×105。當(dāng)遠(yuǎn)離地面時(shí),梯形帆片與橢圓帆片的升、阻力差別較小,但隨著機(jī)翼逐漸接近地面,梯形帆片的增升減阻效率逐漸高于橢圓帆片。而機(jī)翼升阻力的差異,主要是由于局部氣流方向角對(duì)各帆片形成的有效迎角有所差別,使得帆片對(duì)主翼產(chǎn)生不同的增升和減阻貢獻(xiàn)。
[Abstract]:The tip sails disperse the wingtip vortices concentrated in the original wing into several small vortices to accelerate the dissipation of the wingtip vortices and thus reduce the airfoil induced resistance. In order to further understand the effect of tip sail on the flow characteristics of the wing under ground effect, wind tunnel experiments were carried out on the NACA4412 wing with three elliptical and trapezoidal sails. The aerodynamic forces and tip vortex structures of two kinds of airfoil wings were measured, and the reasons for the difference of aerodynamic forces between the two wings were analyzed by comparing the flow structures. The lift and drag of the wing are measured by a six-component cassette wind tunnel balance. The vortex velocity distribution at the tip of the wing is scanned with a seven-hole probe. The Reynolds number of the wing chord is 1.5 脳 10 ~ 5. When far away from the ground, the lift resistance of trapezoid sail and elliptical sail is smaller, but with the wing approaching the ground, the efficiency of increasing and reducing drag of trapezoid sail is higher than that of elliptical sail. The difference of the wing lift resistance is mainly due to the difference of the effective angle of attack formed by the direction angle of the local airflow on the sails, which makes the sails have different contributions to the increase and decrease of drag on the main wing.
【作者單位】： 上海大學(xué)上海市應(yīng)用數(shù)學(xué)和力學(xué)研究所;上海市力學(xué)在能源工程中的應(yīng)用重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(11472169)
【分類(lèi)號(hào)】：V211.41

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