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首页> 外文会议>International Conference on Fluid Power Transmission and Control(ICFP' 2005); 20050405-08; Hangzhou(CN) >Flow Characteristics of Pressurized-Water in Annular Micro-Clearance
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Flow Characteristics of Pressurized-Water in Annular Micro-Clearance

机译：环形微间隙中压水的流动特性

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The flowrate of pressurized-fluid in annular micro-clearance between the piston and cylinder will seriously affect the efficiency of plunger pumps and hydraulic motors. The discharge not only depends on the shape of clearance and pressure, but also on the flow state. In engineering fluid mechanics, the flow state of oil used as transmitting medium of power is laminar flow, but when water is used as transmitting medium, because of its very low viscosity, whether the flowing state of pressurized-water in annular clearance can still be considered as laminar flow? So far, there is no any paper describing it clearly. The relation between the flowrate and Reynolds number in annular clearance is analysed theoretically and a role is obtained that when the diameter of plunger is fixed, the critical flowrate between laminar and turbulence only depends on fluid' property (viscosity). In order to explore flow characteristics of pressurized-water in different condition, a self-designed and self-made experimental device and experimental scheme are introduced which is used to measure flowrate of water. The experimental data that water in 4～15 MPa pressure flows through the clearance of 0.005～0.05mm and seal length of 2～40mm is introduced and analysed, and is compared with theory flowrate of laminar flow. The results show that limit flowrate of pressurized-water through different cylinder to piston clearance is constant when other conditions do not change and the condition of laminar flow of water in annular clearance is clearance value < 0.01 and the pressure < 6.3MPa. and when the clearance value > 0.02mm and the pressure > 8.0MPa, laminar flow will change into turbulent flow. In engineering application, the clearance value cannot be too small (generally > 0.002) and flow pressure of hydraulic equipment is usually larger than 8.0MPa, so the flow of water in annular clearance will be turbulent flow. The research will offer a theoretical foundation for the design and manufacture of water hydraulic component.
机译：活塞和气缸之间的环形微小间隙中的加压流体流量将严重影响柱塞泵和液压马达的效率。排出量不仅取决于间隙和压力的形状，还取决于流动状态。在工程流体力学中，用作动力传递介质的油的流动状态为层流，但是当使用水作为传递介质时，由于其粘度很低，是否仍然可以使加压水在环形间隙中流动。被认为是层流？到目前为止，还没有任何论文对其进行清晰地描述。从理论上分析了环形间隙中流量与雷诺数之间的关系，并获得了这样的作用：当柱塞直径固定时，层流和湍流之间的临界流量仅取决于流体的性质（粘度）。为了探讨不同条件下压水的流动特性，介绍了一种自行设计，自制的用于测量水流量的实验装置和实验方案。介绍并分析了压力为4〜15 MPa的水流过0.005〜0.05mm的间隙，密封长度为2〜40mm的实验数据，并与层流理论流量进行了比较。结果表明，在其他条件不变的情况下，压力水通过不同气缸至活塞间隙的极限流量是恒定的，环形间隙中水的层流条件是间隙值＜0.01，压力＜6.3MPa。当间隙值> 0.02mm且压力> 8.0MPa时，层流将变为湍流。在工程应用中，间隙值不能太小（通常> 0.002），并且液压设备的流量压力通常大于8.0MPa，因此环形间隙中的水流将成为湍流。该研究将为水压元件的设计和制造提供理论依据。

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