煤粉火焰热混合层分形特性研究  

Fractal Characteristics of Thin Thermal Mixing Layers in Coal-Fired Flame

作　　者：白晓静[1] 卢钢[2] 闫勇[1,2] 

机构地区：[1]华北电力大学控制与计算机工程学院,北京102206 [2]肯特大学工程与数字艺术学院

出　　处：《燃烧科学与技术》2017年第3期225-230,共6页Journal of Combustion Science and Technology

基　　金：高等学校学科创新引智计划资助项目(B13009);国家自然科学基金资助项目(61673170;61603135);中央高校基本科研业务费资助项目(2014XS42)

摘　　要：采用数字图像采集系统在煤粉燃烧实验锅炉中采集湍流火焰图像,利用形态学图像处理技术提取火焰热混合层的分形特征,研究了一次、二次和三次风量对火焰热混合层分形特征的影响.研究表明,火焰热混合层分形维数与一次、二次和三次风量呈现出规律的相关性,因此有可能根据火焰热混合层分形维数变化来调整一次风量与二次风/三次风量的比值,为燃烧过程的优化与控制提供参考.The images of turbulent flame were acquired by using a digital imaging system on an industry-scale pulverized coal-fired test rig. The fractal dimensions of thin thermal mixing layers in flame were computed through morphology-based flame image processing techniques. The effects of the ratios of primary air and secon-dary/tertiary air on fractal dimensions were characterized. The results presented in this work show that the varia-tions of fractal dimension are closely related to the ratio changes of primary air and secondary/tertiary air. Therefore,the fractal dimensions of flame thin thermal mixing layers can be used as an important indicator for the control and optimization of a combustion process.

关 键 词：煤粉火焰 热混合层 分形维数 火焰图像 温度梯度 

分 类 号：TK16[动力工程及工程热物理—热能工程]