圆管流掺气减阻理论研究

本文研究了圆管中气液分层层流、分层紊流及掺气混合紊流情况下的阻力减小规律。理论研究表明，圆管中的气液分层层流、分层紊流，即在近壁层内充以空气，可以在相同的水流量下，使阻力下降，实现减阻。而掺气混合紊流时，只有当壁面附近的含气浓度大于圆管中心处的含气浓度时，才能在相同水流量下，使阻力下降，实现减阻

A Theoretical Study of Drag Reduction by Aeration in Pipe Flow

In this paper, under the gas-liquid stratified laminar and turbulent flows, and the mixture turbulence flow by aeration in pipe, the laws of drag reduction have been researched. Itis pointed out from the theoretical study that the drag can be decreased by aeration near to the wall at the same flow rate of waterg under the gas-liquid stratified laminar and turbulent flows.But the drag can be decreased at the same flow rate of water, only when the gas concentration near to the wall is more than one at the center of pipe, for the mixture turbulence flow by aeration in pipe flow.