导管螺旋桨推进器尾流体视速度场的测量

2019/12/02   下载量： 1 次

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应用领域 交通
检测样本 其他
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参考标准 暂无

采德国LaVision公司的两相机2D3C立体PIV测量系统和集成一体化的4台相机构成的MiniShaker测试系统，对水下导管螺旋桨尾流流场进行了测量和理论分析。

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Understanding the interaction of ship, propulsor and waterway is of utmost importance in inland navigation. Regulations and waterway maintenance rely on assumptions for the potential for damage of banks and beds by the propeller wake. Scours for example occurring close to ports and locks where ships need great thrust shall be avoided or repaired at an early stage.
Computational Fluid Dynamics are becoming more and more mature and are already applied for numerous flow phenomena. Especially, in turbulent flows with coherent vortex structures there is still a large demand for validation data and improved computational methods.
3C Particle Image Velocimetry is a powerful non-invasive laser-based method for the measurement of fluid flows. Here all three velocity components are measured simultaneously within a thin light sheet resolving the flow in a 2D plane. However, for many applications and the deeper understanding of transient 3D flows it is desired to measure simultaneously in a volume. Previous 3D particle tracking velocimetry systems suffered from a low resolution and difficulties with a higher density of tracer particles.
The novel system used here to measure the propeller wake behind ducted propellers tries to overcome these disadvantages with the tracking algorithm Shake-the-Box and a new hardware design for straightforward and reliable calibration. The focus of this paper is on a comparison of the new volumetric flow measuring technology with conventional 3C Particle Image Velocimetry. The test case is the wake of a ducted propeller in bollard pull condition.

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北京欧兰科技发展有限公司
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