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Multiscale Simulation of the Hydroabrasive Erosion of a Pelton Bucket: Bridging Scales to Improve the Accuracy

机译:多尺度模拟佩尔顿桶的水管侵蚀:桥接秤提高准确性

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摘要

Erosive wear of hydraulic machines is a common issue, which results in efficiency degradation, the enhancement of cavitation, and the need for expensive maintenance. Although numerical simulations of the erosion process could be very useful, both for understanding and predicting the process, its multiscale nature renders it very difficult to simulate. A previously validated multiscale model of erosion is presented. It consists of two coupled sub-models: On the microscale, the sediment impacts are simulated by means of comprehensive physical models; on the macroscale, the turbulent sediment transport and erosion accumulation are calculated. A multiscale simulation of the erosion of a prototype-scale Pelton bucket impacted by a sediment-laden water jet is presented. The simulation results, namely the erodent flux and the distributions of average impact angle and velocity on the bucket surface, bring insight into the erosion process. Furthermore, the results explain the obtained erosion distribution, which is in very good agreement with the experimental erosion measurements available in the literature for the same test case.
机译:液压机的腐蚀磨损是一个常见的问题,导致效率降低,空化的增强以及昂贵的维护需求。虽然侵蚀过程的数值模拟可能非常有用,但对于理解和预测过程,其多尺度的性质使其变得非常困难。提出了先前验证的多尺度侵蚀模型。它由两个耦合子模型组成:在微尺度上,通过综合物理模型模拟沉积物影响;在宏观上,计算湍流沉积物和腐蚀积累。介绍了由沉积物水射流影响的原型尺度座桶腐蚀的多尺度模拟。仿真结果,即腐蚀通量和铲斗表面平均冲击角和速度的分布,洞察侵蚀过程。此外,结果解释了所获得的侵蚀分布,这与对相同的测试用例的文献中可用的实验侵蚀测量非常好。

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