航行船舶与桥墩间的水动力作用随航行速度不同而变化,致使船舶在航行过程中受力及航行姿态发生变化。采用物理模型试验验证和数学模型计算相结合的方法,以船舶航速为变量,分析了船舶沿程受力、艏摇力矩及重心位移受航速影响的变化规律。研究表明:随着航速的增加,船舶受到的横荡力、艏摇力矩正负峰值相应增加;船舶航速越高,船艏驶至桥墩尾涡负压区时,船舶越容易横向靠近桥墩;船尾驶至桥墩尾涡负压区时,航速越高,船尾越容易横扫桥墩,且后续航行过程中船舶横向远离桥墩偏航越大。研究成果可为后续研究船舶运行安全性和工程中确定安全的船桥间距提供参考。
Abstract
The hydrodynamic interaction between ship and bridge pier varies with the speed of navigation, which result in the changes of force and center of gravity of ship during navigation. In this paper, the laws of force, bowing moment, and center of gravity of ship varying with navigation speed are analyzed via physical model test together with mathematical simulation. Results reveal that the extreme values of transverse swaying force and bowing moment of ship increase correspondingly with the increase of navigation speed. In the presence of higher navigation speed, the ship would be transversely closer to bridge pier when ship head is near the tail vortex zone around pier; while the tail of ship would more easily hit the pier transversely when ship tail is near the vortex zone, and the ship would be more off-course transversely away from pier in its subsequent navigation. The research result would offer reference for future research on navigation safety and safe distance between pier and ship.
关键词
桥墩绕流 /
数值模拟 /
艏摇力矩 /
重心位置 /
UDF(用户自定义函数)
Key words
flow around pier /
numerical simulation /
bowing moment /
center of gravity /
UDF (user-defined function)
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基金
湖南省(长沙理工大学)研究生科研创新项目(CX2016B403)
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