楔形体破舱漂浮过程数值研究

Numerical Simulation of Floating Characteristics of Damaged Wedge

为了对破舱情况下的直升机水上漂浮运动进行预测,以简化的楔形体为研究对象,对其在底部破口情况下的漂浮过程进行数值模拟。在底部破口面积分别为底部总面积的2%、4%和6%的情况下,分析楔形体的漂浮特性与破口进水状况。还研究了底部破口形状及破口位置对进水流量及楔形体运动姿态的影响。研究结果表明:在漂浮前期楔形体会出现一定的浮沉运动;破口面积的增大使楔形体上浮速度峰值显著减小,还使楔形体倾覆时间提前,但对楔形体俯仰及偏航没有很大的影响;破口形状对于进口流量及楔形体漂浮姿态的影响不明显;贴近边缘处的破口更易使楔形体倾覆。这项研究可为破舱浮体漂浮运动预测提供参考。

In order to make an accurate prediction of the floating motion of a helicopter in case of breakage, this paper takes a wedge with bottom breakage as the object to conduct numerical simulation. Effects of break shape and break location on the inlet flow and motion attitude of the wedge are investigated. Results show that there is a certain floating and sinking motion of the wedge in the pre-floating stage. The increase of the break area will lead to a significant reduction in the peak velocity of the wedge and advance the wedge overturning, but there is no significant effect on the pitch and yaw motion of the wedge. The effect of breaking shape on the inlet flow and wedge floating attitude is not significant. Breaking close to the edge will make the wedge easy to capsize. This paper can provide a reference for the prediction of floating characteristics of broken cabin floats.