渠道边壁糙率变化对其输水能力影响研究

为探讨渠道边壁糙率变化对渠道输水能力的影响,采取不同加糙体布置形式对梯形渠道进行加糙,通过河工模型试验分析渠道内断面的垂线流速、壁面切应力以及摩阻流速的变化规律。结果表明:受边壁糙体阻碍作用的影响,靠近渠道边壁的垂线流速较小,中垂线流速大于两侧垂线流速;壅水造成最大流速出现在水面以下;当糙体间距和尾门开度一定时,整体上摩阻流速和壁面切应力随着流量的增大而增大;当尾门开度和流量一定时,糙体间距越小,摩阻流速和壁面切应力越大。

The effects of slip condition and fluid flow through a channel multiple stenoses on micropolar of non-uniform cross-section

In this paper, steady incompressible micropolar fluid flow through a non-uniform channel with multiple stenoses is considered. Assuming the stenoses to be mild and using the slip boundary condition, the equations governing the flow of the proposed model are solved, and closed-form expressions for the flow characteristics （resistance to flow and wall shear stress） are derived. The effects of different parameters on these flow characteristics are analyzed. It is observed that both the resistance to the flow and the wall shear stress increase with the heights of the stenoses and the slip parameter; but decrease with the Darcy number, b^rthermore, the effects of the wall exponent parameter, the cross-viscosity coefficient and the micropolar parameter on the flow characteristics are discussed.