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| Characteristics and influence of cavitation bubble induced by nanosecond pulsed laser |
| TONG Yanqun1,2, HUANG Jianyu1, WU Xiaoyi1, YUAN Shouqi2, Ren Xudong1,2 |
| 1. Department of Mechanical Engineering, Jiangsu University, Zhenjiang,Jiangsu 212013, China; 2.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract Cavitation corrosion of hydraulic machinery is complicated. Surface corrosion resistance technology is hard to achieve. A well controllable nanosecond pulsed laser was used to induce cavitation. The feature images of plasma cavity, cavitation shock wave and bubble pulsation were acquired by a highspeed camera. The influence of laser parameters on the cavitation characteristics such as bubble size and fluctuation time was analyzed. Combined with acoustic signals collected by hydrophone. The pressure of shock wave was analyzed. The residual stress in the laser action region was measured to characterize the surface properties of the material. The relationship between laser parameters and surface properties was analyzed. The experimental results show that the semicircular plasma cavity is generated by the optical breakdown effect. The larger the laser energy is, the longer the period of cavitation bubble pulsation is, and the larger the size of the cavitation bubble is. Shock wave images are clearly acquired when the laser bubble rebounds. The shock wave pressure is almost linearly related to the laser energy. The residual compressive stress is close to the original value under the small energy laser. Under the influence of large energy laser, the residual compressive stress increases rapidly. Residual compressive stress is almost linearly related to the laser energy, and the force is stable. These results provide a reference for research on the cavitation erosion mechanism and control countermeasures.
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Received: 05 June 2017
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