铭刻在心
幼苗
共回答了17个问题采纳率:94.1% 举报
Basically,the airfoil shape serves two closely interrelated functions.The first,obviously,is to
基本来说,机翼的外形提供了两种比较接近的相关功能.首先,很明显是
obtain the maximum lifting force.Secondly,the shape of the airfoil is intended to permit the
获得最大升力.其次,机翼的外形是有意这样设计以便机翼
wing to move through the air with as little resistance as possible:it is the best shape for the
能使通过的空气阻力尽可能的减少;这是最好的形状.
work it has to do.In the language of the aeronautical engineer the efficiency of an airfoil,with
在航空工程师的机翼功效的术语中,
regard to these two functions,is expressed in terms of the "lift-drag ratio".An airfoil with the
关于这两种功能,被表达为术语“升阻比”.
best lift-drag ratio for a particular aircraft is simply the one that furnishes the greatest lift with
对于一个特殊的航空器来说,具有最佳升阻比的机翼只不过就是,气流阻力最小,提供
the least resistance (drag) to the airflow.
最大的升力.
Surprisingly,this very special airfoil shape,as well as many of the other aerodynamic shapes
令人惊讶的是,这种非常特殊的机翼形状,以及许多在航空器设计中使用的
used in aircraft design,have frequently been determined more by trial and error than anything
其他空气动力学形状,与其他的相比,更经常被反复试验来确定下来.
else.This helps to explain why elaborate wind tunnels and extremely accurate scale models
这有助于解释为什么精心制作的风洞及极其精确比例的模型
are so important to aerodynamic research.Obviously,if it is necessary to test endless
对于空气动力学研究来说如此重要.很明显,如果有必要测试无穷多的形状和曲面的组件,
combinations of shapes and curves you must have some way to duplicate the interaction
你必须有许多方法来复制气流和形状间的交互作用
between the airflow and the shape without building a whole new wing or rotor for every experiment.
而不用为每次试验来制作一个完整的新机翼或回转体
1年前
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