Cavitation erosion is one of the most severe problems encountered in hydraulic turbomachinery. When testing the materials, the engineers usually rely on standardized procedures. The most common one being the vibratory ASTM G-32 test, which offers two possibilities of performing the test – the direct, where the specimen is attached to the ultrasonic device and the indirect, where the specimen is stationary and exposed to the ultrasonic horn, positioned just 0.5 mm from it. The erosion rates from the two are significantly different and a question may be asked if they are at all comparable and further on are they comparable to the “real-life” hydrodynamic cavitation which occurs in turbomachinery.

中文翻译：

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对ASTM G32-16（静止试样）标准空蚀试验的质疑


气蚀是水力涡轮机械中遇到的最严重的问题之一。在测试材料时，工程师通常依赖标准化程序。最常见的一种是振动 ASTM G-32 测试，它提供了两种执行测试的可能性 - 直接测试，其中样本连接到超声波设备；以及间接测试，其中样本静止并暴露于超声波喇叭，距离它仅 0.5 毫米。两者的侵蚀率显着不同，可能会问它们是否具有可比性，以及它们是否与涡轮机械中发生的“现实”流体动力空化具有可比性。