This article describes the development of the boundary element method (BEM) to predict the partially submerged propeller (PSP) performance with and without the cup effect, and the 3D unsteady ventilation pattern under an open flow condition. The applied theory is a time-domain BEM, where the perturbation potential is a function of immersion ratio and time. For validation, the unsteady ventilating flow about the 841-B propeller is investigated. It is shown that the formation of the ventilation pattern is captured by the BEM, and the predicted shape of the ventilated surface corresponds well with the experimental observation. Force/moment (components) coefficients are calculated on the key blade of PSP during one cycle in comparison with and without the cup effect. The obtained numerical results are in good agreement with experiments data at high advanced coefficients and in low advanced coefficients reduced.

本文介绍了边界元法 (BEM) 的发展，以预测带有和不带有杯子效应的部分浸没螺旋桨 (PSP) 性能，以及开放流动条件下的 3D 非定常通风模式。应用理论是时域边界元法，其中微扰电位是浸没比和时间的函数。为了验证，我们研究了 841-B 螺旋桨周围的不稳定通风流。结果表明，边界元法捕捉到了通风模式的形成，通风面的预测形状与实验观察吻合良好。与有和没有杯子效应相比，在一个周期内计算 PSP 的键刃上的力/力矩（分量）系数。