课贝努利原理顾睁.pptVIP

Lesson one Bernoulli’s Principle Why Planes Fly （贝努利原理——飞机为什么会飞） vacuum ：真空 curved surface：弯曲表面 venturi：文氏管 carburetor：汽化器 piston engine：活塞式发动机 hydraulic：液压的 reinforce：加强 cross section of an airfoil：翼型剖面 molecule：分子 Abbreviation 缩写 lift and drag coefficients：升力和阻力系数 PSI: Pounds per Square Inch 磅/平方英寸 AOA：Angle of Attack：攻角，迎角 Bernoulli’s principle : Bernoulli’s principle explains the relationship between the pressure, the volume and the velocity of a fluid in motion: the velocity is inversely proportional to its pressure. Long sentence Bernoulli’s principle helps to explain why an airplane flies, how a wing produces lift, and how fuel flows in an aircraft carburetor. In this sentence, explain后接了三个宾语从句：“why an airplane flies”, “how a wing produces lift”, “and how fuel flows in an aircraft carburetor”。 译文：贝努利原理帮助解释了飞机为什么会飞，机翼怎样产生升力，以及燃油怎样在飞机汽化器里流动。 Long sentence Notice that the molecule passing through the venturi must follow a longer curved path, traveling at greater distance in the same period of time as the molecule that follows a straight path. 译文： 注意到，穿过文氏管的分子必须沿着较长的曲线路径运动，和沿直线路径运动的分子相比，在相同的时间内走过了更远的路程。 Long sentence There are other factors to consider, such as the shape of the airfoil, the angle of attack, and lift and drag coefficients as well as the speed of the airfoil through the air. 句中“as well as”是“以及”的意思，翻译时要先翻后面的，再翻前面的。“lift and drag coefficients”是“升力和阻力系数”的意思。 译文：还有其它因素要考虑，像流过翼面的气流速度、翼剖面形状、攻角以及升力和阻力系数。 * * venturi Convergence 收敛 Divergence 发散 Venturi Throat cross section of an airfoil：翼型剖面