波形板壁面液膜的神经网络及混沌特性分析  

Neural Network and Chaotic Characteristics Analysis of Water Film on Corrugated Plate Wall

作　　者：王博 陈博文 田瑞峰 柯炳正 李茹 卢川[2] Wang Bo;Chen Bowen;Tian Ruifeng;Ke Bingzheng;Li Ru;Lu Chuan(Fundamental Science on Nuclear Safety and Simulation Technology Laboratory,Harbin University)

机构地区：[1]哈尔滨工程大学核安全与仿真技术国防重点学科实验室,哈尔滨150001 [2]中国核动力研究设计院,成都610213

出　　处：《核动力工程》2020年第4期60-63,共4页Nuclear Power Engineering

基　　金：中央高校基本科研业务费专项资金——博士研究生科研创新基金项目(3072020GIP1518);国家自然科学基金资助项目(51676052)。

摘　　要：波形板干燥器是船用核动力系统中重要的汽水分离设备,其壁面上自由下降液膜的流动特性对干燥器的汽水分离效率及船用核动力装置的安全性指标有着较大的影响。基于平面激光诱导荧光技术(PLIF)对不同雷诺数下的壁面薄层液膜厚度进行测量。通过小数据量法计算不同工况下的液膜厚度时间序列的最大Lyapunov指数,分析壁面液膜的混沌特性并进行相空间重构。利用反向传播(BP)神经网络解决非线性问题的优势对液膜厚度进行预测,完成了单隐层BP神经网络预测模型的建立并实现了自由液膜厚度的非线性特征分析。结果显示:最大Lyapunov指数与液膜雷诺数呈正相关关系;在大雷诺数区生成的孤立峰同重力及液膜间的叠加作用相互耦合,使液膜混沌特性变得更加明显。The corrugated plate dryer is an important steam-water separation device in marine nuclear power systems. The flow characteristics of the free falling liquid film on the corrugated board wall have a great effect on the steam-water separation efficiency of the dryer and the economic and safety indicators of the marine nuclear power plant. The liquid film thickness of different Reynolds number is measured by the Plane Laser Induced Fluorescence(PLIF) technique. Based on the small data volume method, the maximum Lyapunov exponents of liquid film thickness time series under different experimental conditions are calculated. The chaotic characteristics of the liquid film on the corrugated plate wall and phase space reconstruction is analyzed and performed, respectively. The BP(back propagation) neural network which has the advantage of solving nonlinear problems is applied to predict the liquid film thickness, the prediction model of single hidden layer BP neural network is established, and the nonlinear characteristics of the thickness of the free liquid film is analyzed. Results reveal that the maximum Lyapunov exponent is positively correlated with the liquid film Reynolds number. The liquid film volatility which is increased by the isolated peaks generated in the large Reynolds number region are coupled with gravity and the superposition effect of different liquid films, which makes the chaotic characteristics of the liquid film more obvious.

关 键 词：波形板干燥器 液膜波动性 平面激光诱导荧光技术 混沌特征 

分 类 号：TK173[动力工程及工程热物理—热能工程]