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首页> 外文期刊>Combustion and Flame >A study of the characteristics of slotted laminar jet diffusion flames in the presence of non-uniform magnetic fields
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A study of the characteristics of slotted laminar jet diffusion flames in the presence of non-uniform magnetic fields

机译：非均匀磁场存在下缝隙层流射流扩散火焰特性的研究

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The behavior of laminar jet diffusion flames in the presence of non-uniform magnetic fields has been investigated and the results of this experimental study are presented. It has long been recognized that magnetic fields can influence the behavior of laminar diffusion flames as a result of the paramagnetic and diamagnetic properties of the constituent gases. Using a magnet assembly consisting of neodymium iron boron magnets and gray steel prisms, a non-uniform upward decreasing magnetic field was applied to a laminar jet diffusion flame produced using a slotted burner port. The experimental results show that under certain conditions the application of the magnetic field decreased the flame height, prevented the flame from attaching to the prisms, increased the intensity of the flame, decreased the flow rate for which visible soot inception occurred, and increased the flow rate below which the flame extinguished. It was also observed that the degree to which these phenomena occur is proportional to the product of the magnetic induction times the gradient of the magnetic induction. A discussion as to the reasons for these observations is provided. In addition to traditionally defined dimensionless parameters, the previously defined magnetic Grashof number, the magnetic Froude number, and the ratio of the gravitationally induced buoyancy forces to the magnetically induced body forces are identified as key parameters for determining when a magnetic field will affect diffusion flame behavior. Using these dimensionless parameters, the experimental data was cast in a form that clearly indicated the universal nature of diffusion flame behavior in a non-uniform upward decreasing magnetic field. A power law curve fit to the dimensionless data is presented and discussed.
机译：研究了层流射流扩散火焰在不均匀磁场存在下的行为，并给出了该实验研究的结果。早就认识到，由于组成气体的顺磁和反磁特性，磁场会影响层流扩散火焰的行为。使用由钕铁硼磁体和灰钢棱镜组成的磁体组件，将不均匀向上减小的磁场施加到使用开槽燃烧器端口产生的层状射流扩散火焰。实验结果表明，在一定条件下施加磁场会降低火焰高度，防止火焰附着到棱镜上，增加火焰强度，降低可见烟灰开始发生的流量，并增加流量低于此速率火焰将熄灭。还观察到这些现象发生的程度与磁感应强度乘以磁感应强度梯度的乘积成正比。提供了有关这些观察的原因的讨论。除了传统定义的无量纲参数外，先前定义的磁格拉索夫数，磁弗洛德数以及重力感应浮力与磁感应体力的比值也被确定为确定磁场何时影响扩散火焰的关键参数。行为。使用这些无量纲参数，可以清楚地表明在不均匀的向上减小的磁场中扩散火焰行为的普遍性质的实验数据。提出并讨论了适合无量纲数据的幂律曲线。

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