作者：郭晁昕
对话新能源
空气是一种看不见摸不着的东西。但是，当我们的车辆在高速行驶时，就会发现它其实带来了很大的阻力，从而导致汽车油耗增加。正如我们在逆风而行时，就需要我们耗费很大的体力。所以，研发低风阻汽车是我们目前的趋势所向。
首先我们来说什么是风阻系数：
风阻系数这一概念，通俗点来说就是汽车在行驶过程中跟空气产生的一个对抗。风阻系数越大，汽车所受到的行驶阻力就越大。汽车为了前进，需要克服阻力做功，便需要更大的牵引力，而发动机就需要输出更多的功率。发动机功率的增加直接影响能源的消耗率，从而间接影响汽车的续航。
我们的低风阻有什么优势呢?
1、低风阻可以降低耗电量
一般在综合工况下，风阻系数每降低10%，耗电量大概能够节省3%。车的行驶阻力与车速的平方成正比，消耗功率则与车速的三次方成正比。随速度增大，车的风阻就会按平方规律增加。即每当速度增加2倍时，阻力增加为4倍，而消耗功率则增大为8倍。而风阻系数可以看成是行驶阻力与车速平方之间的比值，同样速度下风阻系数大的车阻力就大，消耗功率就大。反之空气阻力小，消耗功率也小。
2、低风阻可以降低NVH提高行驶舒适性
因为汽车在行驶过程中，周围的气流在汽车的不同外形之处产生了尺度大小不同的漩涡或紊乱的流动，尤其是在车后部及前车窗边。大小漩涡的产生将消耗能量，使漩涡区尤其是车尾部的压力降低，这是引起汽车阻力增大的重要原因。
所以，为降低我们的用车成本，减少充电费用，使车辆在行驶时有着更好的静谧性和稳定性，我们各大车企都在努力的降低汽车的风阻系数，从而使车辆的性能达到最好。
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