升力,就是向上的力。使你上升的力。有很多种了。一般都是说在空气中。也就是向上的力大于向下的力,其合力可以使物体上升。这个力就是升力。升力的成因较复杂,因为要考虑实际流体的粘性、可压缩性等诸多条件。大多用的是库塔儒可夫斯基定理,它是工程师计算飞机升力最精确的方法。具体内容就是由绕翼环流导致升力,产生了上下压力差,这个压力差就是升力 (Y),升力和向后的诱导阻力(d)合成为空气动力(R)。流过各个剖面升力总合就是机翼的升力。升力维持飞机在空中飞行。
n. buoyancy
vt. lift
misc. lift force ; elevating force
The performan ce computation of these waverider configurations such as lift, friction drag,wave drag,lift-to-drag ratio,length,volume,volumetric efficiency,e ct, are presented.
乘波机的性能计算包括升力、粘性阻力、波阻、升阻比、乘波机长度、体积、容积效率等乘波机的各主要性能指标。
参考来源 - 乘波机的构型设计与优化The two phases are governed by the separate continuity equation and the momentum equation. The interface forces including the drag force, virtual mass force, lift force and turbulence dispersion force are calculated in the momentum equations.
支配气液两相流动的基本方程包括分相的连续方程和考虑了曳力、虚拟质量力、升力和湍流分散力等界面力的动量方程,液相湍流模型采用重整化群κ-ε模式,近壁面低雷诺数区采用壁面函数处理。
参考来源 - 螺旋管气液两相流数值模拟·2,447,543篇论文数据,部分数据来源于NoteExpress
飞机得在达到一定的速度以后,才能有足够的提升力从地面起飞。
An aeroplane has to reach a certain speed before there is enough lift to get it off the ground.
较大的羽毛可以逐渐增加升力,直到逐渐实现持续的飞行。
Larger feathers could have increased lift incrementally, until sustained flight was gradually achieved.
即使是前肢发育不全的羽毛也能扩大手臂的表面积,以略微提高升力。
Even rudimentary feathers on forelimbs could have expanded the arm's surface area to enhance lift slightly.
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