Analysis of the hull wake of a twin-screw ship in steady drift by Borescope Stereo Particle Image Velocimetry

被引：9
|
作者：
Capone, Alessandro [1 ]
Pereira, Francisco Alves [1 ]
Maiocchi, Alessandro [1 ]
Di Felice, Fabio [1 ]
机构：
[1] CNR, INM, Via Vallerano 139, Rome, Italy
来源：
APPLIED OCEAN RESEARCH | 2019年 / 92卷
关键词：
Steady drift; Towing tank; Borescope; PIV; FIELD; BEHAVIOR; MODEL; CFD;
D O I：
10.1016/j.apor.2019.101914
中图分类号：
P75 [海洋工程];
学科分类号：
0814 ; 081505 ; 0824 ; 082401 ;
摘要：
The hull wake of a twin-screw ship in steady drift is analysed by means of a novel Stereo Particle Image Velocimetry (SPIV) system based on rigid endoscopic devices (borescope). The measurement apparatus is described in detail; advantages, drawbacks, processing methodology are presented and discussed. In particular the main advantages are: on-board measurement capability, low intrusiveness and no need to develop water-proof camera casings. Steady drift testing are carried out at CNR-INM towing tank, drift angles beta = 8. 4 degrees, +/- 13 degrees, +/- 27 degrees. Modifications of the windward and leeward sides of the hull wake are investigated and their asymmetric features highlighted. In particular, the former is found to be perturbed to a larger extent at moderate drift angles, whereas the latter is characterized by the presence of coherent vortex structures which feature a high degree of spatial and time coherency.
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页数：11
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