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在流体工程学中,关于管路阻力的论述历来就很多。在液压管路设计中,应用的理论是:把管路视作圆管。所采用的直线管,肘形弯管、弯管、T形管、异径管接头,主干管、支管等都会产生管路阻力。这种阻力包括液体的摩擦力、节流孔的阻力、复杂的运动量变化等。直线管的阻力取决于其内的液流是层流还是紊流,在此两种情况下区别是很大的。液压设计中用的阻力计算公式是根据非压缩性流体无加减速度导出的。管路阻力的一般计算公式在有层流和紊流的情况下为:
In fluid engineering, the discussion of the resistance of the pipeline has always been a lot. In the hydraulic piping design, the theory is: the pipe as a round tube. The use of straight pipe, elbow elbow, elbow, T-pipe, pipe joints, the main pipe, branch pipe will have a pipeline resistance. This resistance includes liquid friction, orifice resistance, complex changes in movement and so on. The resistance of a straight pipe depends on whether the flow in it is laminar or turbulent, and the difference is significant in both cases. The resistance calculation formula used in hydraulic design is based on non-compressive fluid without acceleration and deceleration. The general formula for pipeline resistance in the case of laminar flow and turbulence: