Ar-MIP在石英管内传热与流动特征研究
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摘要
本文利用有限元方法建立了大气压下微波氩等离子体(Ar-MIP)三维模型,数值仿真了氩等离子体在不同时刻的温度、压强、速度等参数的空间分布情况,分析了这些参数的相互影响,探究微波等离子体流动瞬态特征.研究结果表明:等离子体气体温度随着时间增加而增加,其高温分布呈现空间不均匀,导致气压的局部变化,影响了流体的流速和流向,形成热流绕热现象,这是导致炬管内高温区域流体速度减缓的主要原因.
A 3-D model of microwave argon plasma(Ar-MIP) under atmospheric pressure is established with the finite element method to describe the temporal and spatial distribution of plasma temperature, pressure, and velocity. The interaction of these parameters is studied to explore the mechanism of microwave plasma excitation. The results show that the plasma temperature increases upon increasing the time, and the high temperature distribution exhibits spatial inhomogeneity, which causes the local changes in gas pressure and affects the flow velocity leading the thermal flow around the heat area. This is the reason that the fluid in high temperature region slows down.
A 3-D model of microwave argon plasma(Ar-MIP) under atmospheric pressure is established with the finite element method to describe the temporal and spatial distribution of plasma temperature, pressure, and velocity. The interaction of these parameters is studied to explore the mechanism of microwave plasma excitation. The results show that the plasma temperature increases upon increasing the time, and the high temperature distribution exhibits spatial inhomogeneity, which causes the local changes in gas pressure and affects the flow velocity leading the thermal flow around the heat area. This is the reason that the fluid in high temperature region slows down.
引文
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[2]Friedman G,Gutsol A,Shekhter A B,et al.Applied plasma medicine[J].Plasma Proc Polym,2008,5:503.
[3]Cho S C,Uhm H S,Hong Y C,et al.Elimination of dimethyl methylphosphonate by plasma flame made of microwave plasma and burning hydrocarbon fuel[J].J Appl Phys,2008,103:370.
[4]Ko Y,Yang G,Chang D P Y,et al.Microwave plasma conversion of volatile organic compounds[J].J Air Waste Manag Assoc,2003,53:580.
[5]过增元.热流体学[M].北京:清华大学出版社,1992.
[6]曹修全,余德平,向勇,等.等离子体发生器结构对热效率的影响[J].四川大学学报:工程科学版,2016,48:178.
[7]Peng H,Xi C.Modeling of the subsonic-supersonic flow and heat transfer in a DC arc plasma torch[J].Plasma Chem Plasma Proc,2001,21:249.
[8]金英俊,罗康,易红亮,等.采用双分布函数格子Boltzmann方法的直流亚等离子体流动与传热分析[J].工程热物理学报,2016,37:830.
[9]Gadonna K,Leroy O,Boisselaporte C,et al.Study of a microwave plasma torch[J].Eur Phys J Appl Phys,2011,56:669.
[10]Yang Y,Hua W,Guo S Y.Numerical study on microwave-sustained argon discharge under atmospheric pressure[J].Phys Plasmas,2014,21:040702.
[11]Zhao G L,Hua W,Guo S Y,et al.Three-dimensional simulation of microwave-induced helium plasma under atmospheric pressure[J].Phys Plasmas,2016,23:073503.