摘要脉冲爆轰发动机是一种利用脉冲式爆轰波产生周期性推力的新型发动机，具有工作范围广、热循环效率高等独特优点，应用前景十分广阔。时空守恒元与求解元方法（即CE/SE方法）是近年来提出的一种新的求解双曲型守恒方程的数值计算方法，它将时间和空间统一对待，具有计算精度高、捕捉间断能力强等优点。为了研究脉冲爆轰发动机管外流场变化特点，本文根据CE/SE方法，主要推导了单管二维无粘、单管二维有粘以及多管三维无粘CE/SE方法的计算格式，编制了数值计算程序，获得了脉冲爆轰发动机外流场的变化特点，分析了脉冲爆轰发动机管外流场中激波和膨胀波等波系的变化特点，该结果对脉冲爆轰发动机实验研究和结构设计具有重要意义。42460

毕业论文关键词  脉冲爆轰发动机  CE/SE方法  数值计算  波系分析  

外文摘要

Title Numerical Calculation of the Complex Flow Field outside Pulse    Detonation Engine

Abstract

Pulse detonation engine (PDE) is a novel engine which produces periodic impulse by utilizing repetitive detonation. PDE has a broad application prospects in army and civilian because of its advantages in wide working scope and  high thermodynamic cycle efficiency.The space-time conservation element and solution element (CE/SE) method is a new CFD method for hyperbolic conservation laws.Its particular features include a unified treatment of space and time, high-resolution, robustness and accuracy.To investigate the characteristics of flow field outside PDE,the two-dimensional inviscid numerical method,the two-dimension viscous numerical method and the three-dimensional inviscid numerical method are induced to calculate the flow field outside PDE according to space-time Conservation Element and Solution Element(CE/SE) method.The corresponding numerical calculation programs have been made, and the characteristics of the flow field in PDE have been attained. In addition, analyses were conducted on the characteristics of the shock wave and expansion wave outside PDE,which is of great significance to the experimental study and structural design of the pulse detonation engine.

Keywords  Pulse Detonation Engine  CE/SE Method  Numerical Simulation  Wave System Analysis

目   次

1  引言 1

    1.1  课题研究的背景和意义 1

    1.2  国内外研究现状 2

    1.3  本文所做的主要工作 5

2  单管脉冲爆轰发动机管外二维无粘流场数值研究 6

    2.1  脉冲爆轰发动机二维轴对称非定常无粘流动数学物理模型 6

    2.2  二维无粘CE/SE方法7

    2.3  脉冲爆轰发动机外二维无粘流场数值计算结果及分析17

    2.4  本章小结20

3  单管脉冲爆轰发动机管外二维粘性流场数值研究21

    3.1  脉冲爆轰发动机二维轴对称非定常粘性流动基本方程21

    3.2  二维粘性CE/SE方法23

    3.3  脉冲爆轰发动机管外二维粘性流场数值计算结果及分析29

    3.4  本章小结32

4  多管脉冲爆轰发动机管外三维无粘流场数值研究33

    3.1  多管脉冲爆轰发动机管外三维非定常无粘流动基本方程33

    3.2  三维粘性CE/SE方法33

    3.3  多管脉冲爆轰发动机管外三维无粘流场数值计算结果及分析46

    3.4  本章小结52

5  总结与展望53

致谢55

参考文献56

1  引言