飞机的升力是怎样产生的？
What is lift? Basically, lift is a force that causes an aircraft to fly. It either equals or exceeds gravitational force to create a tendency to rise into the air. The force that pushes up under the wings of an aeroplane, given the right circumstances and conditions, is lift.
什么是升力?基本上，升力是一种使飞机飞行的力。它或等于或超过万有引力，产生上升到空中的趋势。在适当的环境和条件下，推动飞机机翼下方的力就是升力。
影响飞机升力的因素
The lift equation is a mathematical representation which can be used to properly measure an aircraft’s lifting capabilities. The lift generated by an aircraft depends on a number of factors that are listed below:
- Air density
- Velocity between the air and the object
- Compressibility and viscosity of air
- The surface area of the wing of the aircraft
- Shape of the body under consideration
- And finally, the angle of attack (e. the body’s inclination relative to the flow)
升力方程是一种数学表达式，可以用来正确地测量飞机的升力能力。飞机产生的升力取决于以下几个因素:
- 空气密度
- 空气和物体之间的速度
- 空气的压缩性和粘度
- 机翼:飞机机翼的表面积
- 考虑身体的形状
- 最后是迎角(即物体相对于气流的倾斜度)
The following is the equation to calculate the lift.
这里给出飞机升力的计算公式：
- L denotes lift force.
- V defines the velocity of aircraft expressed in m/s.
- ρ is air density, affected by altitude.
- S is the reference area or the wing area of an aircraft measured in square metres.
- C is the coefficient of lift, depending on the angle of attack and the type of aerofoil.
- L表示升力。
- V定义了以米/秒为单位的飞机速度。
- ρ是空气密度，受海拔高度影响。
- S是飞机的参考面积或机翼面积，以平方米为单位。
- C是升力系数，取决于迎角和机翼的类型。
Conclusion
结论
To sum it all up, the lift equation has made things very easy for aerodynamicists and engineers. If you use the modern lift equation, and consider the lift coefficient given above, you can easily calculate the amount of lift produced at a given velocity for a given wing area.
In a different scenario, where wing area is not mentioned, and where we have been given velocity, we can also determine how large the wings need to be to be able to lift a certain weight, using the lift equation.
总而言之，升力方程使空气动力学家和工程师的工作变得非常容易。如果你使用现代升力方程，并考虑上面给出的升力系数，你可以很容易地计算出给定的机翼面积在给定速度下产生的升力。
在另一种情况下，机翼面积待定时，我们已经给定了速度，我们也可以通过升力方程来确定机翼需要多大才能举起一定的重量。
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