Abstract This short communication is based on a previous experimental study of liquid droplet impingement (LDI) erosion of groove roughness published in Wear 432–433 (2019). In the present study, further experiments were performed using a spray-jet apparatus to understand the erosion mechanism of triple and quadruple grooves using a scanning electron microscope. It was found that the erosion behavior of triple grooves is similar to that of double grooves, as reported in the previous article. However, the erosion behavior of the quadruple grooves is different from that of the double grooves owing to the presence of less eroded groove peaks far from the surrounding smooth walls. This is due to the weakened side-jet effect from the surrounding smooth walls on the isolated groove peak erosion. Furthermore, the role of the central smooth wall between two single grooves was studied, and a decreased erosion was observed with an increase in the length of the smooth wall. These experimental results explain the importance of the surrounding smooth walls on the erosion behavior of grooves.

中文翻译：

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多个凹槽上的液滴撞击侵蚀

摘要 这篇简短的交流基于之前发表在 Wear 432-433 (2019) 中的凹槽粗糙度的液滴冲击 (LDI) 侵蚀实验研究。在本研究中，使用喷射装置进行了进一步的实验，以使用扫描电子显微镜了解三重和四重凹槽的侵蚀机制。发现三槽的侵蚀行为与前一篇文章中报道的双槽的侵蚀行为相似。然而，由于存在远离周围光滑壁的较少侵蚀的凹槽峰，四重凹槽的侵蚀行为不同于双凹槽的侵蚀行为。这是由于周围光滑壁对隔离槽峰值侵蚀的侧射流效应减弱。此外，研究了中心光滑壁在两个单槽之间的作用，观察到随着光滑壁长度的增加侵蚀减少。这些实验结果解释了周围光滑壁对凹槽侵蚀行为的重要性。