Numerical simulations of the flow around two bidirectional staggered propellers are conducted in uniform flow. The computed open water performance of the fore-propeller is compared with the corresponding experimental results, and the influence of the fore-propeller on the aft one is carefully investigated. It is found that the inflow around the aft propeller close to the side of the fore is especially affected by the fore one, leading to abnormal circumferential distribution of force on the blade in the shade region. For either forces or velocity distributions, the abnormal changes behave contrarily for cases with the rotating speed larger or smaller than the idle. Moreover, the more the rotating speed of the fore differs from the idle, the larger the abnormal values become.

中文翻译：

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均匀流动中螺旋桨相互作用的数值研究

在均匀流动的情况下，对两个双向交错螺旋桨周围的流动进行了数值模拟。将计算出的前螺旋桨的开水性能与相应的实验结果进行比较，并仔细研究前螺旋桨对船尾的影响。已经发现，靠近前桨叶侧面的后部螺旋桨周围的流入特别受到前桨叶的影响，从而导致在阴影区域中叶片上力的异常圆周分布。对于力或速度分布，对于转速大于或小于空转的情况，异常变化是相反的。而且，前叉的旋转速度与怠速之间的差异越大，异常值越大。