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Optimum Control of Plasma Flow Systems through Multi-Scale Integration

通过多尺度集成对等离子体流系统进行优化控制

基本信息

批准号：
17206016
负责人：
NISHIYAMA Hideya
金额：
$ 32.45万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17206016/
关键词：
Plasma Functional fluid Multi-scale Nanoparticle Complex interaction Interface Real time simulation Integration

项目摘要

In the present study, the plasma flow systems with multi-scale interactions are analyzed by using multi-scale control method and multi-scale integration to give the fundamental data for cold spray, plasma assist combustion, arc melting process and gas circuit breaker. The obtained results are as follows.1. An integrated model for advanced cold spray process is constructed by integrating nano-micro particle flow model and coating formation model. It is clarified that electrostatic acceleration of nano-particle is effective in the presence of shock wave. The deposition process in the cavity is also clarified by comparing with cold spray experiment.2. The pulsed arc torch and dielectric barrier discharge torch with small input power are developed to produce oxygen and nitrogen radicals and ozone for combustion assist. The effects of applied voltage and frequency on radical concentrations are clarified experimentally. Time evolution of chemical species in an air plasma are also clarified numerically using complex reaction model3. Real time simulations are conducted for purpose of compactness of gas circuit breaker (GCB) and optimization of arc melting process. It is clarified that rough structure in the exhaust tube enhances the rapid cooling of exhaust hot gas for compact GCB. It is shown that the temperature dependent surface tension and mushy zone effect the melting pool structure in an arc-melting systems.

本文采用多尺度控制方法和多尺度积分方法，对具有多尺度相互作用的等离子体流动系统进行了分析，为冷喷涂、等离子体辅助燃烧、电弧熔化过程和气体断路器等提供了基础数据。主要研究结果如下：1.将纳米-微米粒子流动模型与涂层形成模型相结合，建立了先进冷喷涂过程的集成模型。结果表明，在冲击波作用下，静电加速纳米粒子是有效的。通过比较，也阐明了腔内的沉积过程冷喷涂试验.研制了小功率脉冲电弧炬和介质阻挡放电炬，用于产生氧、氮自由基和臭氧助燃。实验上阐明了外加电压和频率对自由基浓度的影响。利用复杂的反应模型，对空气等离子体中化学物质的时间演化进行了数值分析。为了提高气体断路器的紧凑性和优化电弧熔化过程，进行了真实的实时仿真。结果表明，对于紧凑型GCB，排气管中的粗糙结构增强了排气热气体的快速冷却。结果表明，在电弧熔炼系统中，表面张力和糊状区对熔池结构有明显的影响。