等于半径长的圆弧所对的圆心角叫做1弧度的角,用符号rad表示,读作弧度。用弧度作单位来度量角的制度叫做弧度制。另外一种度量角的方法是角度制。弧度制的精髓就在于统一了度量弧与半径的单位,从而大大简化了有关公式及运算,尤其在高等数学中,其优点就格外明显。
因此,零前缘吸力的最坏情况是:由升力引起的阻力系数K是前面确定的升力曲线斜率的倒数(弧度制)。
Thus, in the worst case of zero leading-edge suction, the drag-due-to-lift factor K is simply the inverse of the slope of the life curve (in radians), as previously determined.
Okay. For those who have not seen a radian, it's just another way to measure angle with the understanding that a full circle, which we used to think is 360 degrees, So a radian is roughly 60 degrees.
我想告诉那些还不懂弧度制的同学,这是衡量角度的另一种方法,理解起来是这样的,对于一个整圆,也就是我们之前所说的360°,所以1弧度大约是60°
应用推荐