CLT桨敞水性能的势流预报方法

Potential Flow Prediction Method for Open Water Performance of CLT Propeller

为了提高面元法对尾流收缩叶梢负载(CLT)桨敞水性能的预报精度,通过修正常规面元法中的螺旋桨计算模型、尾涡模型和网格,改进预报CLT桨敞水性能的面元法计算理论。以CLT标准桨(P1727)为研究对象,从CFD方法模拟结果中,提取不同进速下的尾涡螺距和尾涡半径,构建双尾涡模型;提出混合网格划分方法,提高计算精度和效率。将面元法预报结果与国际拖曳水池会议(ITTC)实验数据对比,结果表明,在设计进速附近,推力系数和转矩系数的相对误差在5%以内,效率的相对误差在2%以内,满足计算精度。

In order to improve the prediction accuracy of the panel method calculating the open water performance of the Contracted and Loaded Tip(CLT)propeller,the computational theory of panel method forecasting the open water performance of CLT propeller was revised by modifying calculation model,wake vortex model and grid.The standard CLT propeller(P1727)was taken as the research object,and the wake vortex pitch and radius under different advance coefficients were extracted from the CFD’s simulation results to build the double wake vortex model.The hybrid meshing method was proposed to improve the calculation accuracy and efficiency.Compared with the International Towing Tank Conference(ITTC)experimental values,the results show that the relative errors of thrust coefficient and torque coefficient are less than 5%and the relative error of efficiency is less than 2%under the design advance coefficient,satisfying the calculation accuracy.