Leakage of fluid flow from the cracks in the esti

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Leakage of fluid flow from the cracks in the estimation

2O to 400ramH: O (that is 490N / m ~ 392QN / m), slit the gap from 0.001mm to 1.50mm. Of course, the gap is too large 1.5ram, and here only used as a Society, that the gap t of the average velocity does not increase without increased marrow space, and ultimately tends to a limit, it depends on the pressure difference APz count down 2 (Table omitted 『, physical medium is water (20 ~ C), density p = 998.2kg / m., viscosity = 1.002 × 10.\To 1kgf/cm to 8kgf/cm (ie 98000N / m ~ 784000N / m, Phi slit gap is 0.001anm asked to 1.5ram. numerical example 3 (Jude slightly), the flow off when the media change at 20 ℃ Xiao Wu pressure, density p = 860jg / m., straw SUI coefficient = O.03i58N ・ se /! TI ', the production parameters commitment jet j buried high-pressure phase l Example 2 rain. Operator guillotine 4 (slightly gray), glistening bodies Media run out at 40 ℃ on a backing oil and density o = 876R ~ / 11 \much larger than the viscosity of water, so for the same velocity, the Reynolds number are much smaller than the water in the range of the calculated parameters weeks, the medium is transformer oil and lubricants, the Reynolds number to help does not exceed 2000. still laminar flow, which are more in the reference data for simple, no park laminar and turbulent flow caused by two different data discontinuities. Comparison of 2 to 4 tables of data, when asked to 0 gap .1 ram, the work quality of the pressure rise 4kg/cm., then, both for the East, transformer oil or lubricants, as the layers are flooded state. lubricant leakage flow rate of 0.077m / s, transformer oil clamor leakage flow rate 0.5l6m /, rain leakage flow rate of up to 9.730m / s. As the water viscosity is very small, so the oil Fan Yong much larger than the flow rate, 18.9 times for the transformer oil for Li River's 126.4 times the lubrication. (Continued from page 23) degrees to speed up and improve the lubrication and control the direction and so able to play its characteristics, of course, be determined to further testing. supplemented by water jet tool for pipe extrusion item management process unearthed a whole is not impossible. In particular, areas such as soil in the north to achieve, when greatly simplified the current top management technology, which can be confirmed into the ~-step test. IX preliminary conclusions small high-pressure water jet cutting down exploratory trial earthwork following preliminary conclusions can be drawn: 1, high pressure water jet of fine sand and gravel excavation of soil to be effective, shimmy their way to the jet can be used, parameters for the pump pressure 300x1OPa, nozzle diameter 1.5ram , the coefficient K can be controlled at 3.5. total 41, but with the slit gap increases, the viscosity of smaller and smaller, for example, when the gap increased to lrflm, medium pressure 4kg/cm when water flow rate 18.76m/sec, transformer oil flow rate 13.67m/sec, oil flow rate of 6.19 ~ a / sec. when the water flow rate of 1.37 times the transformer oil for lubrication 3.03 times that of oil, and the quarrel when the gap is 0.1mm compared to the average velocity, viscous effects become smaller. References [1] H.E.H and EJIqHK: CnP-ABOqHHKnOrM knife HqE-CKHMconPOTHB Guardian PAB .r / EMjIM. (Russian, hydraulic friction manual). C2] Jing-Sheng Chao, hydraulic fluid, Mechanical Industry Press. [3] Pan whole, Engineering Fluid Mechanics, Mechanical Industry Press. [4] ZHENG Zhi Yu, Lu Zhongqi editor, fluid mechanics, Mechanical Industry Press. 2 small high pressure water jet for cutting frozen sand joints have a certain effect, a way can be swinging jet, the pressure nozzle diameter of 300 × 10Pa 0.8ram, swing 10 times, cut deep 15cm, water consumption rate can be controlled in 2 × 10m. / crfl below. 3, high pressure water jet on the fools of fine soil and cut down the effect of viscous permafrost is limited, in the current equipment condition, only supplemented by mechanical means necessary (including economic, performance, use the occasion and the need for special requirements, etc.) and engineering applications, maximizing the performance of its water jet to be further tests to determine how. 4, this experiment is exploratory, experimental repetition rate and test their own deeply inadequate, thus resulting inevitably superficial view, to be further deepened through the test.
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