DDG-51驱逐舰首波PIV湍流测量

G. Roth, Daniel T. Mascenik, J. Katz
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引用次数: 0

摘要

在7米长的DDG-51驱逐舰模型周围进行的粒子图像测速(PIV)测量聚焦于附在模型上的液片内的流动,位于船首波与模型分离点的上游。测量是在NSWC的140英尺模型盆地Carderock中进行的,雷诺数为1.6x10^7,弗鲁德数为0.30(均基于船舶长度L)。PIV系统使用1k x 1k的水下数码相机和25 mj/脉冲双头Nd-YAG激光器。数据覆盖了弓形波内靠近自由表面的20厘米× 20厘米的流动区域。当模型通过相机时,从模型上游开始,每隔2.5 cm采集一次数据,直到X/L = 0.1。单独的矢量图显示,在波的底部有一个负涡度的增长区域,而在波的顶部和前表面有一个正涡度的增长区域。在X/L = 0.0690处重复92个瞬时速度分布,计算平均流动和湍流应力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
PIV Turbulence Measurements of the Bow Wave on a DDG-51 Destroyer
Particle image velocimetry (PIV) measurements around a 7-m-long DDG-51 destroyer model focus on the flow within the attached liquid sheet, upstream of the point at which the bow wave separates from the model. The measurements are performed in Carderock, NSWC's 140-ft model basin at Reynolds number 1.6x10^7 and Froude number 0.30 (both based on ship length L). The PIV system uses a 1k x 1k submerged digital camera and a 25-mj/pulse dual-head Nd-YAG laser. The data cover a 20-cm x 20-cm area of the flow within the bow wave near the free surface. As the model passes the camera, data are collected at 2.5-cm intervals beginning from upstream of the model until X/L = 0.1. Individual vector maps show a growing region of negative vorticity originating at the toe of the wave and positive vorticity on the top and forward face of the wave. 92 instantaneous velocity distributions are repeated at X/L = 0.0690 to calculate mean flow and turbulent stresses.
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