基于不同网格类型的某散货船螺旋桨敞水性能预报与研究
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摘要
以53 100 t双壳体散货船的螺旋桨为研究对象,分别进行了敞水试验和CFD计算.首先基于Fluent应用RNGκ-ε模型,采用两种网格模型对螺旋桨进行CFD计算,得到其推力系数和转矩系数.并与敞水试验得到的螺旋桨敞水曲线进行对比,发现分区混合网格误差为8.3%,而非结构网格误差为11.4%,分区混合网格误差较小,计算效率更高.结果表明:由于螺旋桨直径大,转速慢,导致雷诺数过低未达到临界值,使Flunet分析的误差较大,通过成比例缩小螺旋桨直径,加快转速,计算结果误差缩小至5.7%,提高了计算精度,达到了预报要求.
A propeller of 53 100 DWT double-hull bulk carrier is chosen to study its open water performance.CFD software Fluent is applied to the numerical simulation. RNG κ- ε model and two kinds of grid model are used to analyze the performance of the propeller and get its thrust coefficient and torque coefficient. Open water test was carried out to get the performance curves of the propeller. The test results are compared with the ones obtained by CFD simulation. The error of partition hybrid mesh is 8. 3%,and the error of unstructured grid is11. 4%. The error of partition hybrid mesh is smaller and the computational efficiency is higher than the one of unstructured grid. The result shows that the error is big because of the large diameter of propeller and the slow speed. The diameter and the speed can make the Reynolds number become too small and make the error too big.When the diameter of propeller is reduced and the rotational speed is increased proportionally the error can be less than 5. 7%,meeting the requirements of the prediction.
A propeller of 53 100 DWT double-hull bulk carrier is chosen to study its open water performance.CFD software Fluent is applied to the numerical simulation. RNG κ- ε model and two kinds of grid model are used to analyze the performance of the propeller and get its thrust coefficient and torque coefficient. Open water test was carried out to get the performance curves of the propeller. The test results are compared with the ones obtained by CFD simulation. The error of partition hybrid mesh is 8. 3%,and the error of unstructured grid is11. 4%. The error of partition hybrid mesh is smaller and the computational efficiency is higher than the one of unstructured grid. The result shows that the error is big because of the large diameter of propeller and the slow speed. The diameter and the speed can make the Reynolds number become too small and make the error too big.When the diameter of propeller is reduced and the rotational speed is increased proportionally the error can be less than 5. 7%,meeting the requirements of the prediction.
引文
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[2]付颐鑫.船舶螺旋桨敞水性能CFD模拟[D].大连:大连海事大学,2012.
[3]姚震球,高慧,杨春蕾.螺旋桨三维建模与水动力数值分析[J].船舶工程,2008(6):23-26YAO Zhenqiu,GAO Hui,YANG Chunlei.3D modeling and numerical analysis for hydrodynamic force of propeller[J].Ship Engineering,2008(6):23-26.(in Chinese)
[4]赵鹏飞.船用螺旋桨敞水和空化性能CFD预报[D].大连:大连海事大学,2011.
[5]王国栋.螺旋桨水动力、空泡和噪声性能预报方法研究[D].武汉:华中科技大学,2013.
[6]钱卫东,吴成才,冷文浩,等.螺旋桨自动化几何建模和网格划分技术[J].舰船科学技术,2011,33(3):39-43.QIAN Weidong,WU Chengcai,LENG Wenhao,et al.Research on automatic geometric modeling and meshing for marine propellers[J].Ship Science and Technology,2011,33(3):39-43.(in Chinese)
[7]吴利红,董连斌,许文海.基于MATLAB和Pro E的螺旋桨三维建模[J].大连海事大学学报,2011,37(2):17-20.WU Lihong,DONG Lianfu,XU Wenhai.3D modeling of ship propeller based on MATLAB and Pro E[J].Journal of Dalian Maritime University,2011,37(2):17-20.(in Chinese)
[8]程东,朱新河,邓金文.基于UG/Grip的船用螺旋桨三维建模关键技术[J].大连海事大学学报,2009,35(4):121-123.CHEN Dong,ZHU Xinheng,DENG Jinwen.Key technologies for 3D modeling of marine propeller based on UG/Grip[J].Journal of Dalian Maritime University,2009,35(4):121-123.(in Chinese)
[9]王艳华,苏洲,孙团.基于Fluent的螺旋桨水动力特性分析[J].中国水运,2012,12(8):75-79.WANG Yanhua,SU Zhou,SUN Tuan.The characteristics analysis for hydrodynamic force of propeller based on Fluent[J].China Water Transport,2012,12(8):75-79.(in Chinese)
[10]王翔,刘正林,张圣东,等.基于Fluent的螺旋桨水动力性能研究[J].机械设计与制造,2011(6):201-203.WANG Xiang,LIU Zhenglin,ZHANG Shengdong,et al.Study on hydrodynamic performance of propeller based on Fluent[J].Machinery Design&Manufacture,2011(6):201-203.(in Chinese)
[11]董国祥,李建鹏,何惠明.迎浪规则波中螺旋桨敞水性能研究[C]∥2013年船舶水动力学学术会议论文集.北京:中国造船工程学会,2013:644-648.