基于牛顿运动定律的低速翼型升力分析及教学建议

Analysis and Teaching Suggestions on Lift Force of Low-Speed Airfoils Based on Newton′s Law of Motion

基于牛顿运动定律定性分析了低速翼型的升力来源,从“整体”和“局部”两个角度分别阐释了升力的来源.从整体分析,机翼将空气向下加速而获得向上的升力;从局部分析,机翼改变其周围气压,使机翼受到向上的压力差.结合各阶段学生背景知识,给出了对应的教学建议.

Based on Newton′s laws of motion,the source of liftforce of low-speed airfoils was qualitatively analyzed,and the sources of lift force were explained from two perspectives——“overall”and“local”.From an overall analysis,the airfoils accelerate the air downwards and gain upward lift;From a local analysis,the airfoils changes its surrounding air pressure,causing the airfoils to experience an upward pressure difference.Based on the background knowledge of students at each stage,the paper given the corresponding teaching suggestions.