论文部分内容阅读
基于对扇翼飞行器升推力产生机理的数值计算与分析,提出了一种扇翼飞行器机翼的替代方案——吹气机翼。分析了扇翼机翼升推力的产生机理并在扇翼机翼翼型的基础上构建了吹气机翼翼型。建立了两种机翼翼型的数值计算方法,通过对比相对静压分布曲线、速度云图和压力云图,证明了吹气机翼具有与扇翼机翼一样的升推力产生方式,即涡致升推力的形成机制。通过将横流风扇加速后气流流速定义为吹气机翼吹气速度,对比了两种机翼升推力随来流速度和迎角的变化关系。结果表明:两种机翼的升推力变化趋势基本一致,仅在迎角大于20°时,吹气机翼推力值相较扇翼机翼损失了近5倍。总体而言,在常规飞行状态下,吹气机翼能够替代扇翼机翼,为相关飞行器的增升和优化设计提供了一种思路。
Based on the numerical calculation and analysis of the generating mechanism of the propeller fan, an alternative to the wing of the propeller-airfoil is presented. The generation mechanism of the propeller wing lift is analyzed and an airfoil airfoil is constructed on the basis of the wing airfoil. Two kinds of numerical calculation methods of wing airfoil are established. By comparing the relative static pressure distribution curve, velocity cloud chart and pressure cloud chart, it is proved that the blowing airfoil has the same lift generating method as the wing airfoil, The formation mechanism. By comparing the airflow velocity of the cross-flow fan with that of the blow-up fan, the relationship between the thrust of the two wings and the attack angle is compared. The results show that the thrust of two airfoils change basically in the same direction. Only when the angle of attack is more than 20 °, the thrust value of the air blown blade is nearly 5 times lower than that of the airfoil wing. In general, air-blown wings can replace fan-wing wings during normal flight conditions, providing an idea for the enhancement and optimization of the associated aircraft.