A new experimental method on simulating the combined action of cavitation erosion and abrasion was proposed to investigate the erosion mechanism of overflow structure induced by the said processes. An automatic sand mixing device was invented for high-pressure and high-speed flow based on the characteristics of Venturi cavitation generator and hydraulic Bernoulli principle. The experimental system for the combined action of cavitation erosion and abrasion was designed and constructed, and high-speed sand mixing flow only appeared in the test section. A series of tests on the combined and single action of cavitation erosion and abrasion on hydraulic concrete and cement was carried out by using the invented experimental device. Results show that the wear of concrete surface exhibited the combined characteristics of cavitation erosion and abrasion under their joint action. The damage degree of concrete surface under the combined action was more severe than that under a single action. The mass loss of concrete under the combined action was higher than sum of mass losses of concrete under two single actions. The promotion and enhancement between cavitation erosion and abrasion existed in high-speed sand mixing flow. A power exponential relationship was observed between erosion mass loss and flow speed, and the velocity indexes approximated 4.5. Small and light sand particles easily follow water flow. Thus, the strong coupling effect of cavitation erosion and abrasion resulted from the presence of small sand particles. Given the different mechanisms of cavitation erosion and abrasion, presenting the skeleton structure formed by cavitation erosion was notably difficult under the action of abrasion. Meanwhile, abrasion wear easily occurred under the impact of cavitation erosion, and this result is due to the mechanism of the combined action of both processes.

中文翻译：

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高速流动下空化冲蚀与磨损联合作用机理的实验研究

提出了一种模拟空化侵蚀和磨损共同作用的新实验方法，以研究由上述过程引起的溢流结构的侵蚀机制。根据文丘里空化发生器的特点和水力伯努利原理，发明了一种适用于高压高速流动的自动混砂装置。设计建造了空蚀磨损联合作用实验系统，高速混砂流仅出现在试验段。利用本发明的实验装置，对水工混凝土和水泥的气蚀和磨损的组合和单一作用进行了一系列试验。结果表明，混凝土表面的磨损在它们的共同作用下表现出空蚀和磨损的综合特征。联合作用下混凝土表面的破坏程度比单一作用下的严重。联合作用下混凝土的质量损失大于两次单一作用下混凝土的质量损失之和。高速混砂流中存在空蚀与磨损之间的促进和增强。在侵蚀质量损失和流速之间观察到幂指数关系，并且速度指数接近 4.5。小而轻的沙粒很容易跟随水流。因此，气蚀和磨损的强耦合效应是由细小砂粒的存在引起的。鉴于空蚀和磨损的不同机制，在磨损作用下呈现空蚀形成的骨架结构尤为困难。同时，在空蚀作用下容易发生磨蚀磨损，这是两种过程共同作用的机制。