格栅对海底阀箱剪切层处水动力特性的影响分析

戴绍仕;姚熊亮;杨国晶;李 卓

振动与冲击 ›› 2010, Vol. 29 ›› Issue (4) : 207-212.

PDF(2846 KB)
PDF(2846 KB)
振动与冲击 ›› 2010, Vol. 29 ›› Issue (4) : 207-212.
论文

格栅对海底阀箱剪切层处水动力特性的影响分析

  • 戴绍仕;姚熊亮;杨国晶;李 卓
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Effect of the grids on the hydrodynamic characters of suction box at shear layer

  • DAI Shaoshi;YAO Xiongliang;YANG Guojing; Li Zhuo
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摘要

对比船舶海底阀箱剪切层处有无格栅情况时剪切层处的水动力特性,以不可压缩Navier-Stokes方程为控制方程,利用计算流体力学软件CFX中的 LES(Larger eddy simulation)湍流模型,采用Simple算法进行不同箱型结构流激振荡问题的数值计算与分析。数值计算结果表明:阀箱口格栅的存在使得剪切层处流体的流态更加复杂,且具有大量的小涡从箱口导边脱出,在向随边运动中破碎;格栅的存在使得剪切层处稳态压力系数增大,脉动压力系数减小,使剪切层的振荡频率呈现单峰现象,且振频值增大。

Abstract

A contrastive method is applied to study the hydrodynamic character of marine suction box at shear layer between grids and no grids. The incompressible Navier-Stokes equations are taken as the control equation while the advanced turbulent model LES in CFX soft and the simple algorithm are used to carry out the numerical computation about the problem of flow induced oscillation. The numerical results show that the pattern of fluid at shear layers is more complex when the grids exist at box mouth. Additionally, a lot of small eddies shed continuously at leading-edge of box mouth, and moving continuously to trailing-edge. Moreover value of static pressure coefficient will increase owing to the grids and the fluctuating pressure coefficient will reduce, at the same time the frequency of shear layer present single-peaked value which is larger than the value without grids

关键词

格栅 / 海底阀箱 / 流激振荡 / 水动力特性 / 大涡模拟

Key words

Grids / Suction box / Flow induced oscillation / Hydrodynamic character / LES

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导出引用
戴绍仕;姚熊亮;杨国晶;李 卓. 格栅对海底阀箱剪切层处水动力特性的影响分析[J]. 振动与冲击, 2010, 29(4): 207-212
DAI Shaoshi;YAO Xiongliang;YANG Guojing;Li Zhuo. Effect of the grids on the hydrodynamic characters of suction box at shear layer[J]. Journal of Vibration and Shock, 2010, 29(4): 207-212

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