管中紊流新探索

A New Study of Turbulent Flow in Pipes

本文对管中紊流作了新的探索,求得的脉动切应力分布、流速分布、流量和断面平均流速、沿速程阻力系数的通用公式都能符合公认的试验资料,既揭示了紊流断面上的分层结构,又区别了紊流水力光滑区,过渡区和水力粗糙区的性质,还能计算断面上的能流过程.作者的假设吸取了Prandtl L. 混合长度假设中的合理内容,并作了进一步的改进和发展.

In this paper a new study has been made on the turbulent flow in pipes. The distribution of turbulent shear stress, velocity distribution, discharge, average velocity over the cross section and the universal formula for the frictional resistance coefficient obtained on the basis of the new hypothesis are in accordanee with the well-known experimental data. This research reveals the layered turbulent structure over the cross section and distinguishes the characteristics of the hydraulically smooth turbulent flow, transional turbulent flow and complete turbulent flow. The energy flow phenomenon in a cross section can also be computed according to the research. The new hypothesis has taken over the reasonable parts from Prandtl's Mixing length hypothesis, and has improved and developed Prandtl' s theory.