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🧯 管道摩阻损失计算器（达西公式）Pipe Friction Loss Calculator (Darcy–Weisbach)
按达西–魏斯巴赫公式 h_f = f·(L/D)·v²/(2g) 计算水在圆管中流动的沿程水头损失和压降，摩擦系数用 Swamee–Jain 公式（湍流）或 64/Re（层流）求得，内置常见管材的粗糙度。Calculate head loss and pressure drop for water flowing in a round pipe with the Darcy–Weisbach equation h_f = f·(L/D)·v²/(2g); the friction factor comes from Swamee–Jain (turbulent) or 64/Re (laminar), with roughness for common pipe materials.
使用说明与常见问题How-to & FAQ
「管道摩阻损失计算器（达西公式）」是什么？What is the Pipe Friction Loss Calculator (Darcy–Weisbach) tool?
按达西–魏斯巴赫公式 h_f = f·(L/D)·v²/(2g) 计算水在圆管中流动的沿程水头损失和压降，摩擦系数用 Swamee–Jain 公式（湍流）或 64/Re（层流）求得，内置常见管材的粗糙度。Calculate head loss and pressure drop for water flowing in a round pipe with the Darcy–Weisbach equation h_f = f·(L/D)·v²/(2g); the friction factor comes from Swamee–Jain (turbulent) or 64/Re (laminar), with roughness for common pipe materials.
如何使用「管道摩阻损失计算器（达西公式）」？How do I use the Pipe Friction Loss Calculator (Darcy–Weisbach) tool?
在「管道摩阻损失计算器（达西公式）」中，填写「流量 L/min」、「管内径 mm」、「管长 m」、「管材（绝对粗糙度）」、「水温」等参数，结果会随输入实时计算并显示在下方。In the Pipe Friction Loss Calculator (Darcy–Weisbach): Fill in "Flow rate L/min", "Inner diameter mm", "Pipe length m", "Pipe material (absolute roughness)", "Water temperature"; results are recalculated instantly as you type.
用的什么公式？Which formulas are used?
达西–魏斯巴赫：h_f = f × (L/D) × v² ÷ (2g)，压降 Δp = ρ·g·h_f。湍流摩擦系数用 Swamee–Jain 显式公式 f = 0.25 ÷ [log₁₀(ε/(3.7D) + 5.74/Re^0.9)]²，在 5000 ≤ Re ≤ 10⁸、ε/D 为 10⁻⁶–10⁻² 时与 Colebrook 公式相差不超过约 3%（我们的核算中最大约 2.8%，出现在 Re ≈ 5000、ε/D = 0.01；Re ≥ 10⁴ 时不超过约 2.1%）；层流用 f = 64/Re。Darcy–Weisbach: h_f = f × (L/D) × v² ÷ (2g), and Δp = ρ·g·h_f. The turbulent friction factor uses the explicit Swamee–Jain formula f = 0.25 ÷ [log₁₀(ε/(3.7D) + 5.74/Re^0.9)]², within about 1% of Colebrook for 5000 ≤ Re ≤ 10⁸; laminar flow uses f = 64/Re.
包括弯头、阀门的局部损失吗？Does it include fittings and valves?
不包括，只算直管沿程损失。弯头、三通、阀门的局部损失需要另外按局部阻力系数 K 计算。No, only straight-pipe friction. Bends, tees and valves add minor losses that need their own K factors.
粗糙度数值从哪来？Where do the roughness values come from?
是工程手册中常见的新管典型值；旧管结垢后粗糙度会明显增大。They are typical new-pipe values from engineering handbooks; old, scaled pipes are much rougher.
计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?
「管道摩阻损失计算器（达西公式）」使用教科书标准公式（公式写在说明和常见问题中），适合学习和估算核对；涉及安全的工程设计请以规范和实测为准。The Pipe Friction Loss Calculator (Darcy–Weisbach) uses standard textbook formulas (given in the description and FAQ), which is good for learning and checking estimates; for safety-critical engineering follow codes and measured values.
「管道摩阻损失计算器（达西公式）」免费吗？需要注册吗？Is the Pipe Friction Loss Calculator (Darcy–Weisbach) free? Do I need an account?
「管道摩阻损失计算器（达西公式）」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Pipe Friction Loss Calculator (Darcy–Weisbach) is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.