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液压系统冲洗流量对冲洗的影响
发布者:admin  日期:2017-06-08  点击:1125

根据流体力学,液体在管道中的流动状态分为层流和紊流,液体从一个表面冲走颗粒并携至下游的能力正比于液体在元件表面的能量大小。
According to fluid mechanics, the flow of liquid in a pipe is divided into laminar and turbulent flow. The ability of a liquid to remove particles from one surface and carry it down to the downstream is proportional to the energy of the liquid on the surface of the element.
In laminar flow, the surface of the component has a stable layer of liquid, on the surface of the component force is very small, solid particles adhered to the hydraulic pipe on the inner wall is hard to clean, so to improve the washing efficiency, must make the flushing flow state of hydraulic medium in the pipeline for turbulent flow.
The degree of turbulence is determined by Reynolds number:
Re=VDv=4QDV (1) V is the liquid velocity; Q is the pipeline (plastic pipe application and improvement) flow; D is the pipe diameter; V is the hydraulic oil kinematic viscosity.
When the flushing oil is turbulent flow in the pipe, not the whole section is turbulent. In the pipe wall, due to the restriction of the pipe wall and adhesion, there is still a layer of liquid near the pipe wall to maintain laminar flow, that is, the near wall laminar flow layer. Its thickness is greater than the size of the particles attached to the tube wall D, it will affect the washing of particles. Therefore, to obtain a good flushing efficiency, D. must be made
In turbulent flow, the thickness of the laminar flow near the wall in the tube can be calculated by the following empirical formula.
The delta =30DRe approach (2) is the coefficient of drag along the turbulent flow, when 3x103
According to formula (1), (2), the relationship between kinematic viscosity, flow rate, pipe diameter and thickness of near wall laminar flow can be obtained as follows: Q=73.93DvD87 (3)

在层流流动中,元件的表面有一个液体的稳态层,施加于元件表面的作用力很小,粘附在液压机管道内壁上的固体颗粒物很难被冲洗干净,因此要提高冲洗效率,必须使冲洗时液压介质在管道中的流动状态为紊流。
紊流程度由雷诺数决定:
Re=VDv=4QDV(1)式中V为液体流速;Q为管道(塑料管道的应用与完善)流量;D为管道直径;v为液压油的运动黏度。
当冲洗油在圆管内做紊流流动时,并非整个截面上都是紊流。在管壁处由于管壁的限制和附着力的作用,靠近管壁仍有一层液体保持层流状态,即近壁层流层。其厚度大于附在管壁的颗粒尺寸d时会影响对颗粒的冲洗作用。因此要获得好的冲洗效率必须使得d.
在紊流流动中,圆管中近壁层流层的厚度可以用下面的经验公式计算。
δ=30DRe入(2)式中为紊流流动沿程阻力系数,当3x103
根据式(1),(2)可以得到液压机油运动黏度,流量,管道直径和近壁层流层厚度之间的关系为:Q=73.93DvD87(3)
文章来源:http://www.yxpic.com/news.asp?lt=294
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