液体材料超声处理过程中声场和流场的分布规律研究
发布时间：2019-06-24 19:59
【摘要】：针对合金熔体等液体材料的超声处理过程,选取水作为透明模型材料,采用数值模拟计算和示踪粒子实验方法,研究了20和490 kHz两种频率超声作用下水中的声场和流场分布.结果表明,增大变幅杆半径能够提高水中声压水平,扩大空化效应的发生区域.当超声频率为20 kHz时,水中声压最大值出现在超声变幅杆下端面处,且声压沿传播距离的增大而显著减小.如果超声频率增加至490 kHz,水中的声压级相比于20 kHz时明显提高,且声压沿着超声传播方向呈现出周期性振荡特征.两种频率超声作用下水中的流场呈现相似的分布特征,且平均流速均随着变幅杆半径增大表现出先升高后降低的趋势.变幅杆半径相同时,20 kHz频率超声作用下水中的平均流速高于490 kHz频率超声.采用示踪粒子图像测速技术实时观察和测定了水中的流速分布,发现其与计算结果基本一致.
[Abstract]:Aiming at the ultrasonic treatment process of liquid materials such as alloy melt, water was selected as transparent model material. The distribution of sound field and flow field in water under ultrasonic action of 20 and 490 kHz was studied by means of numerical simulation and tracer particle experiment. The results show that increasing the radius of the variable amplitude rod can increase the sound pressure level in water and expand the occurrence area of cavitation effect. When the ultrasonic frequency is 20 kHz, the maximum sound pressure in water appears at the lower end of the ultrasonic amplitude bar, and the sound pressure decreases significantly along the propagation distance. If the ultrasonic frequency increases to 490 kHz, water, the sound pressure level is obviously higher than that of 20 kHz, and the sound pressure exhibits periodic oscillations along the direction of ultrasonic propagation. The flow field in the water under the action of two kinds of frequency ultrasound shows similar distribution characteristics, and the average velocity increases at first and then decreases with the increase of the radius of the amplitude bar. When the radius of the variable amplitude rod is the same, the average velocity of 20 kHz frequency ultrasound is higher than that of 490 kHz frequency ultrasound. The velocity distribution in water was observed and measured in real time by tracer particle image velocimeter, and it was found that the velocity distribution was in good agreement with the calculated results.
【作者单位】： 西北工业大学理学院;西北工业大学航海学院;
【基金】：国家自然科学基金(批准号:51327901,51571164) 陕西省科技新星项目(批准号:2016KJXX-85) 陕西省科技统筹创新工程重点实验室项目资助的课题~~
【分类号】：TG111
本文编号：2505326
[Abstract]:Aiming at the ultrasonic treatment process of liquid materials such as alloy melt, water was selected as transparent model material. The distribution of sound field and flow field in water under ultrasonic action of 20 and 490 kHz was studied by means of numerical simulation and tracer particle experiment. The results show that increasing the radius of the variable amplitude rod can increase the sound pressure level in water and expand the occurrence area of cavitation effect. When the ultrasonic frequency is 20 kHz, the maximum sound pressure in water appears at the lower end of the ultrasonic amplitude bar, and the sound pressure decreases significantly along the propagation distance. If the ultrasonic frequency increases to 490 kHz, water, the sound pressure level is obviously higher than that of 20 kHz, and the sound pressure exhibits periodic oscillations along the direction of ultrasonic propagation. The flow field in the water under the action of two kinds of frequency ultrasound shows similar distribution characteristics, and the average velocity increases at first and then decreases with the increase of the radius of the amplitude bar. When the radius of the variable amplitude rod is the same, the average velocity of 20 kHz frequency ultrasound is higher than that of 490 kHz frequency ultrasound. The velocity distribution in water was observed and measured in real time by tracer particle image velocimeter, and it was found that the velocity distribution was in good agreement with the calculated results.
【作者单位】： 西北工业大学理学院;西北工业大学航海学院;
【基金】：国家自然科学基金(批准号:51327901,51571164) 陕西省科技新星项目(批准号:2016KJXX-85) 陕西省科技统筹创新工程重点实验室项目资助的课题~~
【分类号】：TG111
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