大侧斜螺旋桨敞水性能的RANSEs模拟

RANSEs Simulation of Highly Skewed Propeller's Open Water Performances

采用求解基于雷诺时均处理的流场控制方程计算和分析了大侧斜螺旋桨在进速系数J=0.2～1.0范围内的敞水性能和流场流动特征并与实验数据进行了比较.选择SSTκ-ω二方程紊流模型对湍流进行模拟.结果表明:推力系数与实验值有很好的一致性,误差小于3%;力矩系数较实验值偏大,误差在5%以内,且变化趋势稳定;敞水效率曲线变化趋势与实验一致,最高效率点与实验相同;即使在设计工况附近,螺旋桨尾流仍然存在明显的切向旋转速度;桨叶吸力面靠近叶梢部分存在低压区;r=0.7R叶切面压差最大点位于切面最大厚度处,与切面所能承受最大压应力位置一致.最后计算确定了该螺旋桨模型桨敞水实验时对应的临界雷诺数为7.6×105,与实验情况吻合.该值较国内教科书中提到的ITTC给定临界雷诺数3.0×105要大.

Open water performances and flow patterns of high-skewed propeller with different advance ratios, from 0.2 to 0.9, were numerically simulated based on solving the Reynolds-averaged Navier-Stokes equations in rotating and stationary coordinate systems and compared with the experimental data. The SST κ-ω turbulence model was selected to model the turbulence effect. The thrust coefficient achieves a good agreement for the whole region. The difference of the torque coefficient is less then 5% for all the advance ratios. The open water efficiency shapes well with the experiment data. There are still significant tangential velocities within the wake flow even close to the design condition. The blade suction surface static pressure predictions shows a low region near the tip. The blade section r =0.7R＇s biggest pressure difference lies at the thickest point. The critical Reynolds number Re applies to the model test is investigated at last in this paper, its valve 7.6 × 10^5 is bigger than that given by the ITTC appears in the domestic text books, and corresponds well with the experiment at the same time. 16figs., 14refs.