磁场旋转方向对引发火焰旋转临界值的影响  

Study on the Critical Rotating Speed of a Rotating Magnetic Field Inducing Fire Whirl

作　　者：夏云春[1] 邓志华[1] 王清安[1] 

机构地区：[1]中国科学技术大学火灾科学国家重点实验室,合肥230026

出　　处：《燃烧科学与技术》2004年第5期418-422,共5页Journal of Combustion Science and Technology

基　　金：国家自然科学基金重点资助项目(59936140).

摘　　要：通过对旋转火焰涡运动微分方程式的分析,研究旋转磁场引发火焰旋转时的磁场旋转临界速度与磁场参数之间变化的关系,以及旋转磁场方向的变化对旋转磁场引发旋转火焰时磁场旋转速度临界值的影响规律.实验研究结果表明,随着磁场强度的增加,引发火焰旋转的磁场上临界转速增加,下临界转速则下降;磁场顺时针方向旋转时,引发火焰旋转的磁场上临界转速较逆时针旋转时要小,而下临界转速较逆时针旋转时要大.By means of the analysis of the moving differential equation for fire whirl, the relationship of a rotating magnetic field between the critical rotating speeds of magnetic field and its intensity is studied in the process of a rotating magnetic field inducing fire whirl, and the rules that the direction change influences on the critical speeds of magnetic flied is also studied. The experimental results show that the upper critical rotating speeds of magnetic field inducing fire whirl increase and the lower critical rotating speeds decrease with the increase of the intensity of magnetic field.And the upper critical va-(lues) of the clockwise-rotating magnetic field are bigger than those of the counter-clockwise-rotating magnetic field,while the lower critical values are reverse.

关 键 词：旋转磁场 火焰 临界值 

分 类 号：TK411.28[动力工程及工程热物理—动力机械及工程]