摘要
基于对低雷诺数下仿鸮翼型高效低噪特性的研究,为设计新型风机仿生翼型叶片提供理论参考。本文通过建立长耳鸮翅膀三维模型,并进行非定常数值计算。升阻力系数曲线显示了在小攻角下长耳鸮翅膀具有高升阻比特性。瞬态流场的计算结果表明:长耳鸮翅膀上表面靠近翼根的凸起区域存在明显的负压区,上下表面出现高压差,说明飞行时的升力主要来源于翼根处。在大攻角下,随着截面翼型厚度不断变薄,前缘弯度逐渐减小,在靠近翼尖的位置,尾流漩涡越来越大,致使诱导阻力也逐渐增加,整个上表面靠近翼尖的翼型附近产生了明显的不规则涡结构。
To develop a new bionic fan blade with high efficiency and low noise characteristics, the long-eared owl wing was researched under low Reynolds Number. The three-dimensional modeling of the long-eared owl wing was established to carry out the unsteady numerical simulation. The lift and drag coefficients curve showed that the long-eared owl wing had considerably high lift-to-drag ratio.The results indicated that the cause of the long-eared owl wings with high lift coefficient was the airfoil near the wing root which demonstrably created a negative pressure zone on the upper-surface and differential pressure between up with down surface. The leading edge camber of the airfoil decreased gradually with the thickness of the airfoil constantly became thinner under a large angle of attack. The induced drag increased gradually due to the range of vortex becaming wider near the location of the wingtip. Resulting in the obviously vortex structure on the whole upper-surface of the airfoil especially near the wingtip.
出处
《风机技术》
2016年第1期22-28,49,共8页
Chinese Journal of Turbomachinery
基金
高等学校博士学科点专项科研基金项目(20120201110064)
陕西省科学技术研究发展计划项目(项目编号:2014K06-24)
关键词
仿生设计
翼型
长耳鸮
大涡模拟
bionics design
airfoil
long-eared owl
large eddy simulation
