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                                            液壓系統沖洗流量對沖洗的影響
                                            發布者:admin  日期:2017-06-08  點擊:2653

                                            根據流體力學,液體在管道中的流動狀態分為層流和紊流,液體從一個表面沖走顆粒并攜至下游的能力正比于液體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)

                                            在層流流動中,元件的表面有一個液體的穩態層,施加于元件表面的作用力很小,粘附在液壓機管道內壁上的固體顆粒物很難被沖洗干凈,因此要提高沖洗效率,必須使沖洗時液壓介質在管道中的流動狀態為紊流。
                                            紊流程度由雷諾數決定:
                                            Re=VDv=4QDV(1)式中V為液體流速;Q為管道(塑料管道的應用與完善)流量;D為管道直徑;v為液壓油的運動黏度。
                                            當沖洗油在圓管內做紊流流動時,并非整個截面上都是紊流。在管壁處由于管壁的限制和附著力的作用,靠近管壁仍有一層液體保持層流狀態,即近壁層流層。其厚度大于附在管壁的顆粒尺寸d時會影響對顆粒的沖洗作用。因此要獲得好的沖洗效率必須使得d.
                                            在紊流流動中,圓管中近壁層流層的厚度可以用下面的經驗公式計算。
                                            δ=30DRe入(2)式中為紊流流動沿程阻力系數,當3x103
                                            根據式(1),(2)可以得到液壓機油運動黏度,流量,管道直徑和近壁層流層厚度之間的關系為:Q=73.93DvD87(3)
                                            文章來源:http://www.kougasha.net/news.asp?lt=294
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