报告人：林 光一 教授

Speaker: Prof. A. Koichi Hayashi

主持人：任兆欣 助理教授

Host: Asst. Prof. Zhaoxin Ren

时间：2018年09月05日（星期三） 上午9:30-11:30

Time: 9:30am-11:30am, Sep. 5, 2018

地点：长安校区动力与能源学院大楼225会议室

Place: Conference room 225, School of Power and Energy

主题：两相流动，理论与方法的数值分析

Topic: Numerical analysis on two-phase flow; Theory and method

内容简介:

两相流问题是科学与工程领域中一个非常普遍的问题。该问题的数值分析从20世纪80年代开始，在计算应用中得到了迅速的发展。处理两相流有两种主要方法;拉格朗日和欧拉方法。这节课将从两相流的基本概念和处理方法开始。介绍了两相点火和爆轰计算的一些典型实例。

Introduction:

Two-phase flow problem is one of very popular problem in science and engineering field. The numerical analysis of the problem has been started 1980s and has been developed quickly in computational application since then. There are two major ways to take care of two-phase flows; Lagrangian and Eulerian method. The lecture will start with a fundamental idea of two-phase flow and a method to deal with it. Some typical examples of two-phase ignition and detonation calculation will be presented.

报告人：林 光一 教授

Speaker: Prof. A. Koichi Hayashi

主持人：任兆欣 助理教授

Host: Asst. Prof. Zhaoxin Ren

时间：2018年09月06日（星期四） 上午9:30-11:30

Time: 9:30am-11:30am, Sep. 6, 2018

地点：长安校区动力与能源学院大楼225会议室

Place: Conference room 225, School of Power and Energy

主题：两相流和JP10-空气爆震的化学分析

Topic: Chemical analysis for two-phase flow and JP10-air detonation

内容简介:

氢和碳氢化合物的详细化学反应涉及大量的组分和反应。许多科学家和工程师使用简单的一步反应（我们称之为整体化学反应），既不能提供正确的放热性，也不能提供正确的诱导时间。进一步地，我们必须考虑高压对超声速燃烧、爆震燃烧的反应机理的影响。本讲座将研究面向单相和多相流动以及化学反应应用涉及的复杂的反应机制及应对策略。JP10的化学反应很复杂，而且是液相。当我们需要应对液相如液滴时，我们需要考虑蒸发、液滴尺寸，液滴破碎等等一些液相问题。本讲座将通过JP10液相爆震以及旋转爆震发动机的数值分析提供液相的研究策略。

Introduction:

Detailed chemical reactions for hydrogen and hydrocarbons deal with a large number of species and reactions. Many scientists and engineers use simple one-step reactions (we say “overall chemical reactions”), which do not provide either correct exothermicity or correct induction time. More over we have to worry about high pressure effects on such reaction mechanisms for supersonic combustion; say, detonation. This talk will provide numerical study on what we have to do with complicated reaction mechanisms for single- and multi-phase flow chemical reaction applications. A JP-10 reaction is complicated and especially is liquid. When we have to deal with such liquid phase like droplets, we have to take care of several liquid phase problems such as evaporation, droplet size, droplet break-up, and so on. This talk will provide liquid-phase treatments through JP10 liquid-phase detonation and rotating detonation engine through numerical analysis.

报告人：林 光一 教授

Speaker: Prof. A. Koichi Hayashi

主持人：任兆欣 助理教授

Host: Asst. Prof. Zhaoxin Ren

时间：2018年09月07日（星期五） 上午9:30-11:30

Time: 9:30am-11:30am, Sep. 7, 2018

地点：长安校区动力与能源学院大楼225会议室

Place: Conference room 225, School of Power and Energy

主题：用于数值分析和纳米铝/O2爆震的自适应网格细化方法

Topic: AMR method for numerical analysis and Nano Aluminum/O2 detonation

内容简介:

用于科学和工程问题的数值分析的规模越来越大。但是这种数值计算遇到了时间和成本的问题。为此，自1990年末以来开发了自适应网格细化（AMR）技术。早期AMR用于空间和大气问题，但最近的精确计算需要AMR方法用于小型分析，例如汽车发动机。本讲座将提供AMR的本质解释及其在燃烧射流问题中的应用。气固两相流动与气液两相流动完全不同。作为固相爆震问题的一个例子，将会展示铝/O2爆震问题。特别是当我们处理纳米尺寸的颗粒时，我们必须考虑这种纳米尺寸的问题。讲座将包括解释这样的问题进而展示纳米铝的爆震特征。

Introduction:

Numerical analysis for science and engineering problem is applied for a larger and larger scale. But such numerical calculation hits a problem of time and cost. To this end adaptive mesh refinement (AMR) technique has been developed since late 1990. In the early years AMR is used for space and atmospheric problems, but the recent accurate computation demands AMR method for small size analysis such as automobile engines. The present talk will provide the essence of AMR and its application to a combustive jet flow problem. Soli-gas two-phase flow is, in quite different from liquid-gas two-phase flow. As an example of solid-phase detonation problem, Aluminum/O2 detonation problem will be presented. Especially when we deals with nano-size particles, we must consider such nano-size problem. The talk will include to explain such problem to show the feature of nano-size aluminum detonation.

报告人简介

林 光一，日本青山学院大学机械工程系教授。加州大学伯克利分校硕士，科罗拉多大学博尔得分校博士。林 光一教授是爆震研究的国际领导者，最新的工作包括圆管和矩形管中爆震结构的三维详细数值计算，以及三维旋转爆震。现任国际激波会议咨询委员会委员，日本爆炸学会理事，《Proceedings of Combustion Institute》编委等。曾任日本爆震协会主席，《Shock Waves》编委等。曾获国际爆炸动力学和反应系统最高荣誉A. K. Oppenheim奖，波兰科学院Wactaw Cybulski奖章等。

Speaker’s Biography

A. Koichi Hayashi is the professor in Aoyama Gakuin University. He obtained his M.Sc. in UC Berkeley and Ph.D. in University of Colorado, Boulder. He has been an international leader of detonation study. The most recent work includes three-dimensional detailed numerical calculation of detonation structures in tubes and spinning detonations. He is the international advisory committee member of Int. Symp. on Shock Waves, board member of Japan Explosion Society, editorial board member of Proceedings of Combustion Institute, et al. He was the president of Detonation Society in Japan, editorial board member of Shock Waves, et al. He was awarded the A.K. Oppenheim Award from IDERS, Wactaw Cybulski Medal from Poland Academy of Science, et al.