Investigating high-speed liquid impingement with full-field measurements
Investigating high-speed liquid impingement with full-field measurements
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DOI：
10.1098/rspa.2023.0023
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发表时间：
2023-09
期刊：
影响因子：
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通讯作者：
C. Burson-Thomas;T. Harvey;L. Fletcher;R. Wellman;F. Pierron;R. Wood
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作者：
C. Burson-Thomas;T. Harvey;L. Fletcher;R. Wellman;F. Pierron;R. Wood
液体反复高速撞击固体表面会导致侵蚀，这可能会产生不良后果。近年来，模型预测的能力已经超过了撞击的实验测量；这项工作缩小了这一差距。使用网格方法，对聚甲基丙烯酸甲酯试件在高速(233m S−1)弯曲前缘水射流冲击下的表面位移进行了数万次单独测量。全场测量以5兆赫的速率进行，并根据不同的假设使用两个模型进行解释。结果支持目前对高速碰撞的定性描述。然而，在现有的分析和建模中，普遍认为刚性固体表面的假设是不准确的：只有认识到固体表面柔度影响的模型才能成功地预测测量的位移和加速度的时间和空间变化。该模型预测固体表面吸收的能量不到当量液滴撞击总动能的0.3%。
Repeated high-speed liquid impingement on solid surfaces results in erosion that can have undesirable consequences. In recent years, the capacity of model predictions has exceeded the experimental measurements of an impingement; this work closes the gap. Using the grid method, tens of thousands of individual measurements of surface displacement were taken of the response of a polymethylmethacrylate test specimen to the impingement of a high-speed (233 m s−1) curved-fronted water jet. The full-field measurements were taken at a rate of 5 MHz and interpreted using two models based on differing sets of assumptions. The results support the current qualitative description of a high-speed impingement. However, the widespread assumption of a rigid solid surface in existing analysis and modelling was found to be inaccurate: only the model that recognized the effect of the compliance of the solid surface was successful in predicting the measured temporal and spatial variation in displacement and acceleration. This model predicted that the energy absorbed by the solid surface was less than 0.3% of the total kinetic energy of the equivalent droplet impingement.