磁场对旋转火焰涡量的影响(Ⅰ)  

Study on the Vorticity of Fire Whirl Affected by a Magnetic Field (I)

作　　者：夏云春[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》2005年第3期257-260,共4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：通过对磁场作用下旋转火焰涡量变化特性影响的研究,得到在不同的磁场作用时旋转火焰的旋转特性.研究结果表明:磁场的作用会改变旋转火焰的旋转强度,使火焰的旋转强度降低;对于相同旋转速度的旋转火焰,使火焰停止旋转的时间随磁场强度的增加而减小;在一定的火焰旋转强度(<95r/min)、磁场强度(一般>0.357T)和足够长的时间下,能使旋转火焰的旋转速度降低到零.By studying the vorticity of fire whirl affected by a magnetic field, characteristics of fire whirl is obtained.The study shows that the magnetic field can change the vorticity intensity of a fire whirl, which decreases with the increase of the magnetic density. When the magnetic density is strong enough(>0.357 T), the acting time is long enough and the rotating angle speed of fire whirl is less than 95 r/min, the fire whirl will stop rotating. Meanwhile, at the same rotating angle speed of fire whirl, the stopping time decreases when the magnetic density goes up.

关 键 词：旋转火焰 涡量 磁场作用 旋转强度 磁场强度 变化特性 研究结果 旋转特性 强度降低 旋转速度 速度降 时间 

分 类 号：O357.1[理学—流体力学] X928.7[理学—力学]