沿程损失一般用沿程水头损失或 沿程压强损失表示,沿程水头损失(friction head loss)的符号为h f ,沿程压强损失的符号为p f 。 在边界急剧变化的区域,阻力主要集中在该区域内及其附近,称这种阻力为局部阻力。
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However, For pipes with local resistance loss, the friction head loss caused by the viscosity of fluid does exist, which may lead to the calculation error.
但是在形成局部阻力损失的管段中,还会同时伴随产生由于液体的粘性力引起的漩程水头损失,这就造成了这项损失的计算误差。
Calculation formula of velocity distribution, boundary layer thickness, friction force and loss of water head are given out, in accordance with the result from theory analysis of similitude solution.
对于速度边界层提出了相似性解的解析结果,给出了速度分布、边界层厚度、摩擦阻力和水头损失的解析计算表达式。
Influential factors of friction factor of head loss are analyzed by adopting artificial neural network (ANN).
采用神经网络(ANN)方法对沿程水头损失系数的影响因素进行了分析。
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