Engelund弯道横向流速公式改进  

Improved Engelund formula for transverse velocity in bends

作　　者：马国淇 MA Guo-qi(Shanghai Waterway Engineering Design and Consulting Co., Ltd., Shanghai 200120, China)

机构地区：[1]中交上海航道勘察设计研究院有限公司,上海200120

出　　处：《水运工程》2017年第11期26-28,35,共4页Port & Waterway Engineering

摘　　要：Engelund弯道环流公式理论性强、国际上应用广泛,但底部边界条件假设不尽合理,致使公式不适用于粗糙床面。修正了底部滑移速度,提出河底横向湍流切应力形式,将两者用于边界条件。据此得到光滑和粗糙床面统一的弯道环流流速公式,改进了Engelund公式。改进公式具有普遍适用性,且计算值与实测资料符合度优于前人公式。The transverse velocity formula of Engelund has been widely used internationally because it is strong theoretical.But improper assumptions were adopted when dealing with the bottom boundary conditions,which leads to the bad application to rough bed surface for the formula.This paper amended the slip velocity and then proposed the new form of transverse turbulent shear stress on the bed surface,and joined them together into the calculation of bottom boundary condition.By all of the efforts,the new transverse velocity formula which can be used in both rough and smooth bed surface was produced.The improved formula has universal applicability,and the calculated value is more consistent with the measured data than the previous formula.

关 键 词：弯道环流 Engelund公式 湍流横向切应力 底部滑移速度 

分 类 号：TV143[水利工程—水力学及河流动力学] U612[交通运输工程—船舶及航道工程]