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| CBY桨搅拌槽内湍流结构的研究 | |
| 引用本文： | 刘心洪,郭欣,高正明. CBY桨搅拌槽内湍流结构的研究[J]. 北京化工大学学报(自然科学版), 2010, 37(5): 5-9. DOI: 10.3969/j.issn.1671-4628.2010.05.002 |
| 作者姓名： | 刘心洪 郭欣 高正明 |
| 作者单位： | 北京化工大学 化学工程学院， 北京 100029 |
| 摘 要： | 在槽径为0.192m的CBY桨搅拌槽内,采用时间解析粒子图像测速仪(tim e-resolved PIV,TRPIV)和常规二维粒子图像测速仪(2DPIV)对搅拌槽中速度场进行了测量。分别用小波分析法和角度解析法将搅拌槽中周期性脉动和湍流脉动分开,发现两种方法所得的结果具有较好的一致性,说明了小波分析方法能够提取湍流动能。进一步研究表明,小波分析能将脉动速度分解到各个尺度上,频率越低的尺度所含的能量越大,且各尺度能量有着相似的分布规律。此外,随着雷诺数的增大,无因次化后的周期性脉动动能和真实湍流动能基本不变。 |
| 关 键 词： | 小波分析 搅拌槽 TR PIV 湍流结构 能谱 |
| 收稿时间： | 2010-02-26 |
Investigation of turbulence structure in a CBY impeller stirred tank |
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| LIU XinHong,GUO Xin,GAO ZhengMing. Investigation of turbulence structure in a CBY impeller stirred tank[J]. Journal of Beijing University of Chemical Technology, 2010, 37(5): 5-9. DOI: 10.3969/j.issn.1671-4628.2010.05.002 | |
| Authors: | LIU XinHong GUO Xin GAO ZhengMing |
| Affiliation: | College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China |
| Abstract: | Time-resolved particle image velocimetry(TRPIV) and 2D PIV have been employed to measure the velocity field in a CBY impeller stirred tank with a diameter of 0.192m.Wavelet analysis and angle-resolved method were used to separate the periodic fluctuation and turbulent fluctuation.The turbulent kinetic energy obtained by wavelet analysis agreed with that obtained by the angle-resolved method.This shows that wavelet analysis is able to calculate the turbulent kinetic energy successfully.Wavelet analysis was u... |
| Keywords: | TR PIV |
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