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经过1 min的超声振动空蚀试验后,在不锈钢试样表面形成的空蚀坑周围出现环形彩虹区.表面检测结果表明,该区域经历了高于300℃的高温加热过程.数值计算结果表明在空泡溃灭形成的微射流的高速冲击下,试样表面材料在短时间内发生的塑性变形所释放出的能量是造成材料局部升温的主要原因.在塑性变形相同的情况下,材料的导热系数是影响彩虹环区域大小的关键因素.
After 1 min of ultrasonic vibration cavitation test, a ring-shaped rainbow region appeared around the cavitation pits formed on the surface of the stainless steel specimen.The surface test results showed that the region underwent high temperature heating higher than 300 ℃ .The numerical results showed that Under the high-speed impact of microfluid formed by vacuolization, the energy released by the plastic deformation of the sample surface material in a short time is the main reason for the local temperature rise of the material.When the plastic deformation is the same, the thermal conductivity of the material Coefficient is a key factor affecting the size of the rainbow ring area.