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以燃煤锅炉积灰为背景,对不同入射速度条件下SiO_2颗粒与光滑表面撞击特性进行实验研究。实验采用高速摄像机得到了颗粒法向的入射速度和反弹速度,重点研究了颗粒载体与撞击平台温差相同时,入射速度对粒径约为20μm颗粒的撞击特性影响。结果表明,不同温度场内颗粒法向恢复系数随法向入射速度的增大先急剧增大后平缓最后减小;颗粒入射法向速度相同时,法向恢复系数随平台温度的升高而减小;临界捕集速度随平台及气流的温度升高而增大。
Based on the fouling of coal-fired boiler, the impact properties of SiO_2 particles and smooth surface under different incident velocities were experimentally studied. Experiments using high-speed camera to get the particles normal incidence rate and rebound speed, focus on the particle carrier and the impact temperature difference between the same platform, the incident speed on the particle size of about 20μm impact characteristics of the particles. The results show that the normal coefficient of particle recovery increases sharply at first and then decreases with the increase of normal incident velocity. When the normal velocity of particle incidence is the same, the normal recovery coefficient decreases with the increase of the platform temperature Small; Critical capture rate increases with platform and airflow temperature increases.