不同糙面类型管道沿程阻力系数计算方法研究

Study on Calculation Method of Frictional Resistance Coefficient of Pipeline with Different Rough Surface Types

在紊流过渡区,自然工业糙面与人工均匀糙面沿程阻力系数的变化规律差异明显,目前尚无适用于计算各类糙面沿程阻力系数的统一公式。在既有研究基础上,通过对人工均匀糙面沿程阻力系数变化曲线数字化,并引入壁面粗糙均匀度的概念,最终建立了适用于各类糙面及紊流各分区计算沿程阻力系数的统一公式。

In the turbulent transition zone,there are obvious differences in the variation of the coefficient of friction resistance between natural industrial rough surface and artificial uniform rough surface.There is no unified formula that can be applied to all kinds of rough surfaces at present.By digitizing the variation curve of frictional resistance coefficient in artificial uniform rough surface and introducing the concept of rough wall evenness,the unified formula which can be suitable for all kinds of rough surfaces was established.