非圆形断面直管中的恒定紊流

本文对非圆形断面直管中恒定紊流出现横向环流的必然性、三维流动的二元性质、流线的螺旋性质、涡线的投影和主流速等值线的重合现象、势能的沿流变化、时均能量的沿程损失、横向环流的相对独立性以及和主流速的相互联系,进行了分析.文中还给出了方形断面和等边三角形断面直管中恒定紊流的求解方法.

Steady Turbulent Flow in Straight Ducts of Noncircular Cross-Section

This paper analyzes the steady turbulent flow in straight ducts of noncircular cross-section, including the certainty of existence of transverse circulation, the two variable nature of the three-dimensional flow, the spiralling nature of streamlines, the coincidence of the vortex-line's projection and the main velocity contour, the variation of potential energy along the flow, the time-averaged energy loss along the distance, and the relative independence of the transverse circulation and its relationship with the main velocity. With respect to the solution technique, amethod is proposed for steady turbulent flow in straight ducts of rectangular and equilateral-triangle cross-sections.