耙吸挖泥船艏喷轨迹曲线及流场特性的数值模拟

Numerical simulation on the path curve and flow characteristic of bow-spray for trailing suction hopper dredger

通过CFD数值模拟方法模拟了耙吸挖泥船艏喷不同工况时的喷射轨迹曲线及流场特性,得到了不同工况下的艏喷喷射距离及流场特征,对比数值结果与施工现场测量结果,显示数值模拟结果与现场试验结果基本相符,数值模拟基本可以预测艏喷的喷射距离和流动特征。在此基础上,对艏喷轨迹线和喷射距离的影响因素进行了分析,结果表明:45°喷角比30°喷角喷射距离要远,但是30°喷角有利于回淤与流失量的控制。因此在不同的施工阶段,可调整喷射角度,达到最佳施工效果。

The CFD method is used to simulate the path curve and flow characteristic of bow-spray for trailing suction hopper dredger （TSHD） .The spray distance and flow characteristic under different bow-spray conditions are simulated. The numerical simulation results correspond with the construction ones. The results show that the numerical simulation method can accurately predict the path curve of the bow-spray on TSHD and provide reference basis for the construction.On this basis, influencing factors of the spray distance and path are analyzed.The results show that the spray distance of the 45 degree angle is further than that of the 30 degree angle, but it is beneficial to control the sedimentation and loss under the 30 degree angle. Therefore, the best effect can be achieved under the different conditions by adjusting the different injection angles.