摘要
测量污染物浓度场是环境工程的研究热点之一,基于此自主设计开发了基于图像分析的射流浓度场扩散试验装置,该装置共包括3个部分:试验水槽装置、射流装置、图像采集与分析系统。通过搭建试验水槽装置,以罗丹明B作为射流示踪物质,利用图像处理技术显示和分析射流浓度场,模拟研究污染物在水体中扩散特征。分别设计了对静态和横向流动环境中的射流浓度场扩散试验,结果表明,自主设计的试验装置可以定量显示和分析恒定流动条件下射流浓度场及其射流轨迹,同时验证了本装置用于浓度场扩散研究的可行性。
The paper is aimed at introducing a pollutant diffusion testing apparatus for measuring the pollutant concentration field based on the jet concentration diffusion observation and analysis of the experimental platform, which is made of three main parts ： the water flume system, the jet system and the image acquisition and analysis system. For the study purpose, we have first of all designed an experimental platform by using the rhodamine B as the tracer material and applying the digital image processing technology to display the jet concentration field and imitate the pollutant diffusion in water. The aforementioned flume experimental apparatus consists of a storage tank, an organic glass flume, a sewage tank with a stainless steel frame. The design principles of the above mentioned experiment apparatus can be stated as follows： the constant submersible water pumped into the storage tank, whose overflowing port can help to guarantee the water level maintenance at a constant rate, whereas the storage tank is linked with the flume, on the condition that the water level in the storage tank should be kept unchanged, with the water being pressed into the flume from the outlet of the storage tank at a constant pressure and a constant current. At the same time, it is necessary to regulate the water flow velocity in the flume by changing the overflow port and the flow valve of the storage tank. What is more, the jet system has to be made up of a storage tank with the jet discharge solution, a water pump, a flow control valve, a rotor-meter and a jet pipe with its diameter being 2 mm and a jet flow controlled by the flow control valve and the rated rotormeter. As to the image acquisition system, it has to be attached to an CMOS industrial camera joined with a computer, in which the intervals between each image account for 1/30 s. By nature, the images are instan- taneous pictures, whose acquisition time is merely 10 ms while its image preprocessing should be done based on the Matlab. To deal with the problems in the study, we have designed two groups of the jet diffusion experiments in the hydrostatic conditions and six cross-flow conditions which tend to have different velocity ratios of the jet and the cross-flow flume. The analysis of the jet features and its concentration trochoid under the different conditions, rela- tion with the jet dilution and jet concentration trajectory, it can be found that the results can well be matched up with those of the previous report, thus indicating that the self-designed experimental platform is qualified enough to monitor the horizontal momentum jet concentration field effectively in the hydrostatic and crossflow conditions.
作者
丁涛
张瑞芬
应承希
何默为
宋青青
DING Tao ZHANG Rui-fen YING Cheng-xi SONG Qing-qing(College of Quality and Safety Engineering, China Jiliang University, Hangzhou 310018, China)
出处
《安全与环境学报》
CAS
CSCD
北大核心
2016年第6期247-251,共5页
Journal of Safety and Environment
基金
浙江省自然科学基金项目(LY13E090005)
关键词
环境工程学
试验装置
图像处理
射流浓度场
射流轨迹
environmental engineering
testing apparatus
image processing technology
jet concentration field
jet concentration trace
