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Sehen Sie sich die Kollektion für die COMSOL Conference 2023 an
电磁辐射对燃油危害是加油站、炼油厂、油气基地等大型设施禁用手机和其他无线通讯设备的重要原因。不同于静电对燃油蒸气的危害,本文的研究重点在于分析不同频率下的射频放电击穿特性。基于射频等离子体鞘层模型,通过多物理场仿真,分析了12M~300MHz频率下的氩气射频放电过程。仿真结果表明,当激励频率大于雪崩击穿临界频率时,两侧极板附近会形成随激励周期变化的鞘层区,中心区域为准电中性的等离子体区。同时,当激励频率远小于等离子体频率时,鞘层会促进极板附近的γ电离过程;随着频率增大,鞘层特性会逐渐退化,而中心区域的α电离过程会增强。此外,放电特性曲线表明,频率越高,板间放电电压越小 ... Mehr lesen
基于磁流体动力学与Maxwell方程组,建立微束等离子弧焊电弧的二维轴对称模型,应用COMSOL软件进行求解计算,得到了微束等离子弧焊的电弧温度场、流场、电流密度、电弧所受洛伦兹力以及工件表面电弧压力分布情况,并通过实验所拍摄的电弧形态对模拟的温度场加以验证。结果表明微束等离子弧焊电弧温度、等离子体速度与电弧所受洛伦兹力具有相同的变化趋势,均从阴极到阳极先增大后减小,从电弧中心逐渐向四周降低,最大值出现在喷嘴内部中心区域;电弧电流密度在阴极下端面取得最大值,在工件上表面取得最小值,且从阴极到阳极减小速度呈一个先减小后增大再减小的趋势;电弧压力与等离子体流速径向变化相同 ... Mehr lesen
线板电极结构是电晕放电装置中一种常见的结构,但是其电晕放电的发展过程却一直不清楚。本文利用comsol中的等离子化学模块,对大气压条件下空气介质中线板电极的负电晕放电发展过程进行了仿真研究。在仿真模型中,高压电极为线电极,板电极为地电极,模型包含了12中粒子之间的26种反应,其涵盖了典型的弹性碰撞,碰撞电离,电荷转移,复合反应,附和与解离反应。最终的仿真结果显示,在电晕放电发展初期存在一个脉动过程,等离子体以脉冲的形式向地电极扩展。当电晕处于稳态时,在高压电极处是以O4+为主的阳离子,在远离高压电极处的地方以O2-及O-等阴离子为主 ... Mehr lesen
We propose a triple band tunable and high-efficient reflected cross-polarization converter (CPC) in the mid-infrared. The study of graphene-integrated CPC becomes increasingly important, due to its tunable optical performance and small volume. Graphene, a monolayer of carbon atoms ... Mehr lesen
It has already been demonstrated that fluid models can be used to simulate two-dimensional axisymmetric inductively coupled plasma via implementation in the COMSOL (multi-physics simulation software) platform. In this study, we improved the model and simulated a large scale magnetized ... Mehr lesen
Damages caused by lightning overvoltages remains to be an important issue for electrical industry, putting limitations for efficiency of transmission and distribution of electrical energy. Modern solutions for lightning protection such as multichamber arresters (MCA) for overhead ... Mehr lesen
Metal-organic chemical vapour deposition (MOCVD) is a well-known process to produce high quality thin films that can protect, ennoble and functionalize metallic tools. To realize a high performance coating on a complex 3D mold surface, knowledge about the material formation from a ... Mehr lesen
Plasma electrolytic polishing (PeP) is an electrochemical method for surface treatment. In detail PeP is a special case of anodic dissolution [1] that unlike electrochemical polishing requires higher voltage and uses environment friendly aqueous solutions of salts. When the process ... Mehr lesen
Plasma gasification of biomass is emerging as an efficient way to reduce the carbon foot print of waste management while generating renewable energy. In general, gasification is a process where electromagnetic wave energy is used to heat biomass sufficiently to convert the bio-mass to ... Mehr lesen
The Helicon Injected Inertial Plasma Electrostatic Rocket (HIIPER) is an electric space propulsion concept to generate denser ion and electron beams using inertial electrostatic confinement (IEC) fusion theory and helicon source. Helicon source is employed to generate the plasma and the ... Mehr lesen