摘要
目的研究气液两相流动的规律,为水污染处理提供实验依据。方法通过图像处理的方法获得气泡羽流中心位移的偏移量和气泡的速度,采用快速傅里叶变化的计算方法获得气泡羽流的振动频谱和气泡的波动频谱。结果气泡羽流在纵横比为1.0时,气泡羽流中心的振动频率减小,纵横比为1.5时,频率由小到大再到小,纵横比为2.0时,不同位置的频率变化不同。结论气泡羽流的中心在不同水深处和不同位置时,随着压强增大,气泡羽流的振动峰值和频率随之减小,气泡的波动峰值也变小,而波动频率增大,从而揭示了气液两相流流动不稳定性的一般规律。
Aim To study the law of gas-liquid two-phase flow and to provide experimental evidance to water pollution treatment.Methods Image processing method is used to obtain the velocity vector and the void fraction of the displacement of bubble plume centers;Fase Fonrier Translation is applied to get the vibrational spectrum of bubble plume and the fuctuation sepctrum of bubbles.Results When the aspect ratio is 1.0,the central vibration frequency of bubble plume is detected in the low;when the aspect ratio is 1.5,the central vibration frequency of bubble plume is detected growing from low to high,and then to low.When the aspect ratio is 2.0,the vibration frequency of bubble plume is differernt in differernt locations.Conclusion When the pressure is increasing in different water depths and different location,the frequency and the peak of bubble plume oscillation is detected in the low,fluctuations peak of bubble is also detected in the low,but the bubble fluctuation velocities is found in the high frequency,hence demonstrating the general rule of unstable flow of gas-liquid.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第6期1101-1105,共5页
Journal of Northwest University（Natural Science Edition）
基金
国家博士后基金资助项目(20070410378)
陕西省教育厅省级重点实验室科研与建设计划基金资助项目(08JZ50)
关键词
气泡羽流
振动频谱
波动频谱
bubble plume
vibrational spectrum
fluctuation spectrum
