摘要
为研究时间因素对扩散系数拟合计算的影响,基于经典扩散模型分析其拟合过程中的理论误差,并选用不同时间段及时间间隔的颗粒煤瓦斯扩散动力学试验数据,通过常规及定截距2种线性拟合方式分析扩散系数及确定系数R^2随时间的变化趋势。结果表明:拟合理论误差随着扩散时间延长而降低,常规拟合和定截距拟合计算得到的扩散系数随着扩散时间的延长而趋于相同,但两者得到的扩散系数随时间段、时间间隔增大呈现不同变化特征,并受到0点数据的影响。
In order to study influence of time factor on fitting and calculation of diffusion coefficient,theoretical error during fitting process was analyzed based on classical diffusion model.Then,variation trends of diffusion coefficient and determination coefficient R2 over time were analyzed through conventional and fixed intercept linear methods with experimental data of gas diffusion dynamics in coal particles at different time periods and intervals.The results show that theoretical error of fitting decreases as diffusion time extends,and diffusion coefficient calculated by conventional fitting and fixed intercept fitting tends to be the same over time.However,it varies a lot with the increase of time period and interval and is affected by data at zero time.
作者
张宪尚
ZHANG Xianshang(State Key Laboratory of Gas Disaster Detecting,Preventing and Emergency Controlling,Chongqing 400037,China;Gas Center,Chongqing Research Institute,China Coal Technology and Engineering Group,Chongqing 400037,China;College of Architecture&Environment,Sichuan University,Chengdu Sichuan 610065,China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2020年第2期60-65,共6页
China Safety Science Journal
基金
国家“十三五”重点研发计划资助项目(2018YFC0808001)。
关键词
瓦斯扩散系数
经典扩散模型
扩散时间
线性拟合
定截距
gas diffusion coefficient
classical diffusion model
diffusion time
linear fitting
fixed intercept
