| 赵懿珺,贺益英,谭水位,吴一红.大范围、高帧频PLIF 浓度场测量系统的开发及应用[J].水利学报,2015,46(1): |
| 大范围、高帧频PLIF 浓度场测量系统的开发及应用 |
| Development and application of PLIF system with large scale and high frequency for concentration measurement |
| |
| DOI： |
| 中文关键词: PLIF 鲍威尔镜 菲涅尔镜 荧光素钠 射流浓度场 |
| 英文关键词: PLIF Powell prisms Fresnel lens column treatment fluorescein sodium concentration field |
| 基金项目: |
|
| 摘要点击次数: 3934 |
| 全文下载次数: 29 |
| 中文摘要: |
| 平面激光诱导荧光技术（Planar Laser Induced Fluorescence，PLIF）是环境水力学领域研究污染物紊动扩散机理的重要手段。采用鲍威尔棱镜与菲涅尔透镜组合扩展蓝色激光束、生成光强分布比较均匀的平行片光，通过高速摄像机采集高分辨率的荧光图像，据此开发了大范围、高帧频PLIF浓度场测量系统，解决了常规PLIF技术测量区域小、采样频率低、片光分布不均匀的问题。提出了适用于矩形平行片光特点的参数标定方法及浓度场还原算法，并初步用于恒定流条件下的垂直射流浓度场研究。结果显示，喷口附近(z - zo )/lm < 1 范围内属动量作用近区，射流轴线最大高度为(zmax - zo )/lm = 2.3。与已有研究成果的对比表明，本系统测量的射流浓度场合理可信，验证了系统的可靠性。 |
| 英文摘要: |
| Planar Laser-induced Fluorescence Technique （PLIF） is an important technique for the study of mechanism of contaminant turbulent diffusion in environmental hydraulics research area. A PLIF system with large survey scale and high frame frequency has been developed to measure concentration field. A beam of blue light emitted by an argon ion laser is extended to a parallel light sheet with more uniform light intensity through the combination of Powell prisms and Fresnel lens.Fluorescence， excited by an irradiation of fluorescein sodium solution， is collected by a video camera with high frequency and resolution.This system solves the problems of conventional PLIF system with smaller scale， lower frequency and uneven distribution of light sheet. A specific calibration process and algorithms of concentration field were proposed firstly for rectangular parallel light sheet，and corresponding application was performed for the concentration filed of round vertical heated jet in a steady flow. The results show that in the momentum dominant zone (z - zo )/lm < 1，and the maximum height of jet axial is governed by the expression of (zmax - zo )/lm = 2.3.Measured concentration field was compared with previous results， which shows that the results given by this PLIF system are reasonable and reliable. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |