基于CFD的绞吸船绞刀防石设备水力性能研究

绞吸船施工过程中常常会遇到石块、杂物糊堵吸入口或泥泵而影响绞吸船的连续施工,目前解决该问题最有效的方法是在绞刀处加装防石设备。然而防石设备没有标准的形式,不同单位研制了不同的防石设备,各种防石设备对绞吸船吸入能力的影响一直没有办法定量评估。首先总结了目前常用的防石设备形式,然后采用CFD方法对加装不同防石设备前后绞吸船吸入口附近流场进行模拟,计算加装防石设备前后绞吸船的吸入段水力损失,确定了由于加装防石设备造成的局部水力损失系数。经研究表明,防石网和双防石环结构引起的水力损失较大,单防石环和犬牙式防石格栅水力损失最小。为选择防石设备提供了基础数据。

Hydraulic characteristics of anti-stone device in cutter head of cutter suction dredger based on CFD

The construction process of the cutter suction dredger will be stopped by the blockage of stone frequently,and the best way at present is to install anti-stone device in the cutter head.But there is no national standard for it.Different companies have developed different types of anti-rock devices,and there has been no quantitatively way to assess the impact of these devices on the suction capacity of the cutter suction dredger.This paper summarizes the form of commonly used anti-rock devices,uses CFD method to simulate the different flow field around the suction port between with and without installation of anti-rock devices,computes the hydraulic losses of the dredger when using different anti-rock devices,and determines the coefficients of hydraulic loss of different anti-rock devices.The result shows that the hydraulic loss of net anti-rock device and double ring anti-rock device is larger,and that of ring anti-rock device and staggered anti-rock device is the least.It provides the basic data for the selection of anti-rock devices.