Stereo Particle Image Velocimetry Measurements of the Wake Fields Behind A Panamax Bulker Ship Model Under the Ballast Condition
Stereo Particle Image Velocimetry Measurements of the Wake Fields Behind A Panamax Bulker Ship Model Under the Ballast Condition
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DOI：
10.3390/jmse8060397
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发表时间：
2020-05
影响因子：
2.9
通讯作者：
Tie-cheng Wu;Wanzhen Luo;D. Jiang;R. Deng;Yu-long Li
中科院分区：
文献类型：
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作者：
Tie-cheng Wu;Wanzhen Luo;D. Jiang;R. Deng;Yu-long Li
本文应用粒子图像测速技术对巴拿马型散货船模型在压载状态下的尾流场进行了测量。研究表明，弗劳德数为0.167。测量了时均速度、湍流脉动、湍流动能、雷诺应力和涡量信息，并与设计工况进行了比较。时均速度等值线表明，道碴和设计条件具有明显的钩状轴向速度等值线;但它们出现在不同的位置。压载条件下最大的不同是桨盘区的顶部靠近自由水面，在自由水面附近形成了一个均方根速度脉动较强的区域。在压载条件下，湍流速度脉动区对TKE、雷诺应力和轮毂帽涡都有影响。在设计和压载条件下，U型艉在水流中会产生强烈的舱底涡。
Particle image velocimetry is applied in this study to measure the wake flow field of a Panamax Bulker ship model under the ballast condition. This investigation revealed that the Froude number is 0.167. The time-averaged velocity, turbulent fluctuations, turbulent kinetic energy (TKE), Reynolds stresses, and vorticity information were measured to perform a comparison with the design condition. The time-averaged velocity contours indicated that the ballast and design conditions have distinct hook-like axial velocity contours; however, they appeared at different positions. The big difference under the ballast condition is that the top of the propeller disk area is near the free surface and a region with strong root mean square velocity fluctuation is formed near the free surface. The TKE, the Reynolds stresses, and the hub cap vortex (Hcv) are all affected by the turbulent velocity fluctuation region under the ballast condition. A strong bilge vortex (Bv) is produced when the water flows through the U-shaped stern for the design and ballast conditions.