冰临近过程中螺旋桨的水动力性能计算分析

Hydrodynamic Performance Calculation of a Propeller Under the Action of an Approaching Ice Block

为了研究非接触工况下的冰桨干扰水动力载荷,以粘性流体力学为基础,运用重叠网格技术,开展了冰桨干扰的定常计算方法的研究。首先,通过与实验结果的对比,验证了方法可行性;其次,基于重叠网格技术,研究了干扰冰运动到不同空间位置时,螺旋桨水动力性能的变化趋势和规律;计算时,各计算域均采用切割体非结构化网格,各域之间通过重叠网格的嵌套进行数据的传递。为了更好地捕捉桨前流场的细节,在冰桨间隙处进行了多层网格的局部加密,同时结合SSTk-ω湍流模型进行冰桨近场水动力计算。总结出冰对螺旋桨的影响是由冰在桨前产生的干扰伴流区域位于桨盘面以内的面积以及与桨的相对位置共同决定的。计算结果具有一定的可靠性,可为冰区螺旋桨的设计与性能计算提供参考。

In order to study the hydrodynamic loading under the non-contact condition,the steady calculation method of the ice-paddle interference was studied based on the viscous fluid mechanics and the overlapping grid technique.Firstly,the feasibility of the method were verified based on the comparison of the experimental results.Secondly,based on the overlapping grid technology,the trend and rule of propeller hydrodynamic performance were studied when the ice is moved to different spatial positions.The unstructured mesh of the incision body was used,and the data were transferred between the domains by nesting the overlapping meshes.In order to better capture the details of the front of the paddle,the local encryption of the multi-layer grid was carried out at the ice-paddle gap,and the near-field hydrodynamic calculation of the ice-paddle was carried out by combining the SST turbulence model.It is shown that the effect of ice on the propeller is determined by the area of the disturbed orifice region located in the paddle surface and the relative position of the paddle.The results have a certain reliability,which can provide reference for the design and performance calculation of the ice propeller.