管道中湍流强度及湍流积分尺度随时间的变化研究  

Investigation of Variation of Turbulence Intensity and Turbulent Integral Scale with Time in Tube

作　　者：杨辉[1] 崔鑫[2] 郑昕[2] 金芳勇[2] 王尚勇[2] 丁以斌[2] 

机构地区：[1]安徽雷鸣科化股份有限公司,安徽淮北246000 [2]安徽省安全生产科学研究院,合肥230061

出　　处：《安全与环境工程》2013年第4期102-104,113,共4页Safety and Environmental Engineering

摘　　要：采用PIV技术对垂直方形管道内喷粉过程中气流产生的管道湍流实际强度进行了测量,得到喷粉过程中气流导致的管道湍流强度和湍流积分尺度随时间的变化曲线,进而对湍流积分尺度进行了试验测量和理论计算。结果表明:喷粉结束后湍流强度在水平方向上和垂直方向上随时间的变化都符合指数衰减规律;初始阶段湍流积分尺度随时间先快速增加,500ms时(即喷粉结束的瞬间)达到最大值1.54cm,此后湍流积分尺度随时间迅速衰减,800ms后仅为0.55cm,且湍流积分尺度与湍流强度大小相关;湍流积分尺度理论计算值与试验实际测量值基本一致。该结果对定量分析湍流状态下粉尘燃烧爆炸试验具有重要的意义。By PIV technique,this paper measures the turbulence intensity in the process of powder jet in vertical square tube, carries on the experiment calculation and theoretical analysis of turbulent integral scale and obtains the variation curves of turbulence intensity and turbulent integral scale with the time in the process of powder jet. The results indicate that the decay curves of turbulence intensity in the horizontal direction and vertical direction with time are negative exponents after the powder jet; the turbulent integral scale increases with time rapidly at the ini tial stage, reaches the maximum value （1.54 cm） at 500 ms, and then rapidly decays with time,the turbulent inte gral scale relates to turbulence intensity. Finally,a simplified theoretical analysis of turbulent integral scale is basi cally in accordance with calculation resluts. The study is important to the quantitative analysis of the combustion and explosion experiment of dust in the turbulent state.

关 键 词：粉尘燃烧爆炸试验 湍流强度 湍流积分尺度 PIV技术 

分 类 号：X932[环境科学与工程—安全科学]