格尼襟翼对某运输机翼型的增升试验研究

An investigation of increasing lift on large transport byusing Gurney flap positioned at the trailing-edge

利用新技术、新措施、新方法进行增升研究是飞行器布局研究的重要课题之一。作者结合某型运输机在改型中需要进行增升的工程应用背景,通过二元翼型的测力、测压及流动显示试验研究,详细研究了格尼襟翼的增升机理和对该运输机翼型的增升效果。研究结果表明,对该运输机,格尼襟翼的最佳高度为当地弦长的2%,升阻比最大可增加13%左右,因此可以满足该运输机改型的需要。同时,格尼襟翼的增升方式具有较好的推广应用价值。

It is one of the important problems to increase lift of the airplane by using new technology and method. In this paper, the mechanism of increasing lift of Gurney flap is studied. The purpose of the investigation is to provide new method of increasing lift for a certain large transport which would be reformed. During the research, a detail investigation is carried out on a twodimension airfoil to understand the mechanism by means of lift and pressure measurement together with flow visualization. From the above research, it can be defined that the optimum height of the sawtooth flap is 2% of the local chord length. The result shows that the maximum increase of the rate between lift and resistance is 13%. 