基于DES的舰船空气尾流场特性分析
发布时间:2019-06-10 12:24
【摘要】:舰船上层建筑后方产生湍流尾流场会对舰载直升机的操纵产生严重威胁。采用CFD方法对舰船空气尾流场的特性进行分析研究,突破了雷诺时均方法的局限性,使用分离涡模拟(DES)方法求解瞬态舰船尾流场,按照一定频率采样流场数据,得出的平均流场明显比RANS方法的结果更贴近实验数据,证明了此方法的有效性。同时,运用DES方法直观地观察尾流场的涡特性、流动分离和再附着等特征,发现涡结构及其不对称性是舰船空气尾流场的主要特征,涡强度在烟囱处突然增强,可能对直升机的操纵产生不利影响。
[Abstract]:The turbulent wake field behind the ship superstructure will pose a serious threat to the maneuvering of shipborne helicopters. The characteristics of ship air wake field are analyzed and studied by CFD method, which breaks through the limitation of Reynolds time average method. (DES) method is used to solve the transient ship wake field, and the flow field data are sampled according to a certain frequency. The results of the average flow field are obviously closer to the experimental data than those of the RANS method, which proves the effectiveness of the method. At the same time, DES method is used to observe the vortex characteristics, flow separation and reattachment of the wake field intuitively. It is found that the vortex structure and its asymmetry are the main characteristics of the ship air wake field, and the vortex intensity suddenly increases at the chimney. It may have a negative impact on the manipulation of helicopters.
【作者单位】: 华中科技大学船舶与海洋工程学院;海军装备部驻武汉地区军事代表局;
【分类号】:U674.70
本文编号:2496446
[Abstract]:The turbulent wake field behind the ship superstructure will pose a serious threat to the maneuvering of shipborne helicopters. The characteristics of ship air wake field are analyzed and studied by CFD method, which breaks through the limitation of Reynolds time average method. (DES) method is used to solve the transient ship wake field, and the flow field data are sampled according to a certain frequency. The results of the average flow field are obviously closer to the experimental data than those of the RANS method, which proves the effectiveness of the method. At the same time, DES method is used to observe the vortex characteristics, flow separation and reattachment of the wake field intuitively. It is found that the vortex structure and its asymmetry are the main characteristics of the ship air wake field, and the vortex intensity suddenly increases at the chimney. It may have a negative impact on the manipulation of helicopters.
【作者单位】: 华中科技大学船舶与海洋工程学院;海军装备部驻武汉地区军事代表局;
【分类号】:U674.70
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