更多“对于新管，美国一般取当量粗糙度Ke=0.02mm，前苏联平均…”相关的问题
第2题
美国气体协会测定了输气管在各种状况下的绝对粗糙度。The gas society measured the absolute roughness of the pipe under various conditions.
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第3题
管道当量粗糙度考虑了管道形状损失的影响，一般比绝对粗糙度大2~11%。The equivalent roughness of pipeline takes into account the influence of pipeline shape loss, which is generally 2~11% higher than the absolute roughness.
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第4题
输气管加上内壁涂层，既可减少内腐蚀也大大降低了粗糙度，在同样条件下使输气管输气量增加5~8%，有的甚至高达10%。The inner wall coating on the pipe can reduce the internal corrosion and roughness. Under the same condition, the gas volume of the pipe can be increased by 5~8%, some even as high as 10%.
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第5题
根据流动管道内所处的流动状态具有不同的摩擦阻力系数。There are different friction resistance coefficients according to the flow state in the flow pipe.
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第6题
内壁涂层的费用一般只占钢管费用的2~3%，只要输气量提高1%，就能很快地回收成本。The cost of inner wall coating generally only accounts for 2~3% of the cost of steel pipe, as long as the gas transmission capacity is increased by 1%, the cost can be quickly recovered.
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第7题
当雷诺数≤2000时，流体的流动处在层流状态，管道的阻力只与雷诺数有关。When Reynolds number ≤2000, the fluid flow is in a stagnant state, and the resistance of the pipeline is only related to Reynolds number. 这是因为管壁上凹凸不平的地方都被平稳滑动着的流体层所掩盖，流体在此层上流过如同在光滑管上流过一样。This is because the bumps in the wall are covered by a layer of fluid that glides smoothly through it as it would through a smooth tube.
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第8题
当雷诺数为 2000 ~ 4000 时，流体的流动处在临界区，或是层流或是紊流，管道的阻力还不能作出确切的关联。When the Reynolds number is between 2000 and 4000, the fluid flow is in the critical region, either stagnant or turbulent.
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第9题
由于输气管几乎都在阻力平方区，所以对于干线输气管摩阻系数的求法各国都有专用的公式。Since almost all the pipelines are in the resistance square area, there are special formulas for calculating the friction coefficient of the main pipeline.
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第10题
输气管的输气能力和水力摩阻系数是随着时间而变化的，如果是不含硫化氢的干气，气中的固体颗粒对管壁的磨光作用，使投产后的输气管的粗糙度和水力摩阻逐渐减小，输气能力增大。The gas transmission capacity and hydraulic friction coefficient of the delivery pipe change with time. If the dry gas does not contain hydrogen sulfide, the polishing effect of solid particles in the gas on the pipe wall will make the roughness and hydraulic friction of the delivery pipe gradually decrease and the gas transmission capacity increase after the production.
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