Consultez les proceedings de la Conference COMSOL 2024
A power supply is generally used in many electrical devices. In order to deliver uniform power irrespective of time variation, most plasma equipment also uses a power source. Therefore, the power condition in plasma simulations is essential. In time-dependent models using a current ... En savoir plus
Helicon Injected Inertial Plasma Electrostatic Rocket (HIIPER) [1] is a plasma thruster being researched at University of Illinois Urbana-Champaign. It has been shown in Figure 1. It involves a helicon source along with an Inertial Electrostatic Confinement (IEC) chamber. IEC is a fusion ... En savoir plus
Helicon Injected Inertial Plasma Electrostatic Rocket (HIIPER) [1] is an advanced space propulsion system being studied in University of Illinois Urbana-Champaign. It has been depicted in Figure 1. An experimental setup is already being used to gather dynamics of plasma with the help of ... En savoir plus
In this study, plasma processing parameters of a dielectric barrier discharge (DBD) based argon plasma was carried at atmospheric pressure in flat plate configuration. The time dependent one-dimensional plasma module was adapted for modeling of the DBD in copper electrodes with quartz ... En savoir plus
Pseudospark (PS) discharge is a low pressure hollow cathode discharge for generation of high intensity and high current density electron beams [1-3]. As the frequency of the microwave devices increases, the dimensions of the beam-wave interaction region gets reduced. In THz frequencies, ... En savoir plus
Microwave plasma sources with a resonant cavity have been widely used in microwave electrothermal thrusters as an electric propulsion device, in which free-floating plasma is ignited and sustained in a propellant gas. The resonant cavity microwave plasma has become increasingly ... En savoir plus
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 ... En savoir plus
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 ... En savoir plus
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 ... En savoir plus
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 ... En savoir plus