The analysis of aerodynamic drag data shows that air drag coefficient reaches 0 . 539 空气阻力试验数据分析表明,模型的空气阻力系数为0 . 539 。
Canard wing increases lift coefficient with the penalty of the increase of drag coefficient 低于主机翼的鸭翼将加强前掠翼布局的缓失速特性。
The increase of drag coefficient is significant at higher angles of attack 鸭翼增大升力的同时也增大了阻力;大攻角时,鸭翼带来的阻力增量较大。
The analysis of changing transitional corner between the front and top of the model illustrate that air drag coefficient can be reduced 23 . 30 % 前围与车顶的过渡由较小圆角变为较大圆角的试验分析表明,空气阻力系数可以降低23 . 30 。
The c . e . in both 2d and 3d problem increase the lifting forces , the c . e . in 3d problem decreases the " drag coefficients , but the c . e . in 2d increases the drag a little 波动效应也随着高度的增加而减少,但是和曲壁面效应相比,衰减速度要小得多。波动效应具有减阻作用。
In conclusion , the design of automobile model is not only to reduce drag coefficient but also to improve lift coefficient , so the automobile has good performance 综合以上工作,明确了汽车车头设计不仅要考虑空气阻力系数的降低,同时要考虑升力系数的变化,以保证良好的行驶性能。
Fixed the angle of attack , in subsonic situation , the drag coefficient was reducing with the velocity increasing ; in supersonic situation , the drag coefficient was increasing with the velocity increasing 攻角不变,亚声速情况下,阻力系数随速度的增大而减小;超声速情况下,阻力系数随速度的增大而增大。
As for fixed vehicle spacing , with the increase of vehicle number in platoon , the average drag coefficient can reduce by 20 % ~ 30 % and the vehicle with the lowest drag is about at the center of the platoon 在固定间距下,随着队列中车辆数目的增加,平均阻力系数可降低20 % ~ 30 % ,阻力最低的车大致处于车队的中心位置。
Finite differential method ( fdm ) was applied to analyze the external flow field by fluent and calculate the drag coefficient , and the result of the external flow field by changing the shape of automobile model can be compared 采用有限差分法,运用fluent软件,分析某轿车模型附近的流场,计算出阻力系的数值,研究车身前部改进对汽车外流场的影响。
The calculating formulas show that braking distance depends on initial braking speed , road dragging coefficient , mad slope grade , braking force increasing time ; and nothing to do with total mass of crane 计算公式表明:决定汽车起重机制动距离的主要因素是制动初速度、路面阻力系数、道路坡度和制动力增加时间;汽车起重机总质量与制动距离无直接关系。