基于黏度特征气体探测识别方法的数值模拟  

Numerical Simulation of Gas Detection and Recognition Method Based on Viscosity Characteristic

作　　者：杨淞成 刘文昕 刘嘉欣 郑皓宇 张洪铭 赵兰明 YANG Songcheng;LIU Wenxin;LIU Jiaxin;ZHENG Haoyu;ZHANG Hongming;ZHAO Lanming(School of Environmental and Chemical Engineering,Jiangsu Ocean University,Lianyungang 222005,China;State Key Laboratory of Fire Science,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]江苏海洋大学环境与化学工程学院,江苏连云港222005 [2]中国科学技术大学火灾科学国家重点实验室,安徽合肥230026

出　　处：《江苏海洋大学学报（自然科学版）》2021年第3期53-57,共5页Journal of Jiangsu Ocean University:Natural Science Edition

基　　金：江苏省教育厅高等学校自然科学研究面上项目(17KJB620001);中国科学技术大学火灾科学国家重点实验室开放课题(HZ2017-KF10);江苏省自然科学基金资助项目(BK20201030);江苏省研究生科研与实践创新计划项目(KYCX19_2266,KYCX19_2264)。

摘　　要：为丰富目前的火灾探测方法,提高火灾中气体探测的能力,提出了一种基于黏度特征的气体探测识别方法,并进行了数值模拟验证。根据泊肃叶定律,构建气体黏度与微压差响应定量关系,并利用计算流体力学工具对二维管道模型内流场进行理论计算。模拟结果显示,气体流经管道所产生的压力损失与管道长度呈良好线性关系,并且基于气体黏度差异导致的微压差响应信号可以对不同类型气体进行精准探测识别,设计内径1 mm毛细管束型传感器件结构对微压差信号具有显著的放大作用。In order to enrich the current fire detection methods and improve the ability of gas detection in fire,a gas detection and identification method based on viscosity characteristics is proposed and validated by computational fluid dynamics method.The corresponding relationship between gas viscosity and micro-pressure difference is constructed according to Poiseuille’s law.Two-dimensional theoretical calculation model is constructed and internal flow field is obtained.The simulation results show that the pressure loss caused by the gas flowing through the pipeline has a good linear relationship with the length of the pipeline,and the micro pressure difference response signal caused by the difference in gas viscosity can accurately detect and identify different types of gases.Magnification effect of specially designed bundle of capillary tubes pack with an inner diameter of 1 mm is also proved to be feasible and effective.

关 键 词：气体黏度 气体探测 泊肃叶定律 计算流体力学 数值模拟 火灾探测 

分 类 号：X924[环境科学与工程—安全科学]