(重点阅读)气动热辐射的直接蒙特卡洛法模拟

国内图书分类号：TK123

国际图书分类号：621.18

工学硕士学位论文

气动热辐射的直接蒙特卡洛法模拟

硕 士 研究生：付元钢

导 师：董士奎 副教授

申请学位级别：工学硕士

学 科、专 业：工程热物理

所 在 单 位：能源科学与工程学院

答 辩 日 期：2007年7月

授予学位单位：哈尔滨工业大学

Classified Index:TK123

U.D.C: 621.18

Dissertation for the Master’s Degree in Engineering

SIMULATION OF AIR FLOW AND THERMAL RADIATION USING DIRECT SIMULATION OF MONTE CARLO

METHOD

Candidate:

Supervisor:

Academic Degree Applied for: Speciality:

Affiliation:

Date of Oral Examination: University: Fu Yuangang

Associate Prof. Dong Shikui Master of Engineering Thermal Physics Engineering School of Energy Science and Engineering

July,2007

Harbin Institute of technology

摘要

摘 要

直接模拟蒙特卡洛法(DSMC)是近年来迅速发展起来的一种有效的计算稀薄气体非平衡流的工程计算方法。它以分子动力论为基础，从分子微观角度出发来模拟Boltzmann方程所描述的物理过程，有效的解决了包含有热化学非平衡反应及热辐射等物理化学过程在内的稀薄气体流动的问题，在稀薄气体动力学学科中获得了广泛的应用。

本文采用可变硬球（VHS）模型，Larsen-Borgnakke非弹性碰撞能量交换模型模拟了圆柱绕流，获得了流场的温度、密度、压强等物理量的分布情况；重点考察了一维激波结构，获得了不同马赫数下的激波位置、厚度；采用Bird的TCE化学反应模型，模拟了楔形绕流流场，再现了“真实气体”效应。通过计算不同楔角下的流场分布情况，重点分析并讨论了压力系数、热流系数的变化情况。在此基础上，本文以原子分子辐射理论为基础计算得到了流场内的辐射吸收、发射系数，研究结果为进一步求解高温非平衡气动热辐射耦合问题打下了基础。

在上面论述的基础上，本文构造了含有非平衡反应的稀薄气体流动的DSMC模拟的流程图，并且对其中重要过程进行了详细的阐述。

关键词：直接模拟蒙特卡洛，高超音速流，化学非平衡，热辐射，吸收系数

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哈尔滨工业大学工学硕士学位论文

ABSTRACT

The direct simulation Monte-Carlo (DSMC) method was rapidly developed fast development of computer science in recent years.DSMC is an efficient tool in engineering implication for rarefied gas nonequlibrium flow. Based on the Molecular gas dynamics, DSMC simulates the physical procedure of Boltzmann equation from the microscopic aspect, therefore it can well solve the problem of dilute gas flow with thermochemical nonequlibrium reaction and heat radiation. The method has been used widely in the subject of gas dynamics .

In this paper, the variable hard sphere (VHS) model and the Larsen-Borgnakke model is employed to simulate the cylindrical flow, the tempture, density, pressure of the flow field are obtained in the example of cylindrical flow. By the simulation of one dimention shock wave, we get the position and the length of the shock wave.Employing the TCE chemical reactions model developed by Bird,the wedge flow is simulated in different angels and some useful results are obtained.In these basises, the radiation absorb, emit coefficients in the flow field are calculated by the theories of atom and molecule radiation.The results make a firm basis for the further solving the problem of high-tempture non equilibrium flow and thermal radiation couple.

At last，the direct simulation Monte Carlo method with nonequilibrium chemically reations and have been performed respectively and the comparative study has been made.The important part is explained.

Keywords: Direct simulation Monte Carlo method，Hypersonic flow，Nonequilibrium chemical reaction，Thermal radiation，Absorb

coefficient

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