压缩机叶栅湍流数值模拟的研究

论文摘要

压缩机广泛应用于能源动力、航空航天、制冷工程等领域。研究压缩机叶栅内部复杂的湍流流动,对改进性能、提高效率、降低成本具有重要的理论意义和工程应用价值。 压缩机叶栅内流场十分复杂,观察和研究极其困难。本论文采用混合网格和有限体方法,求解Reynolds平均Navier-Stokes方程,应用三种湍流模型,即标准的k-ε模型,k-ω模型,SST模型,对三个攻角（+5.0°、-1.5°、-8.5°）下的双圆弧叶片的轴流式压缩机叶栅进行了湍流数值模拟。将模拟结果与实验结果对比分析,探讨适合压缩机叶栅流动模拟计算的湍流模型,给出轴流式压缩机叶栅正确的流动结构。 研究结果表明,SST模型,模拟计算的静压系数、速度场、湍流度与实验结果接近,吻合得很好;k-ω模型次之;标准的k-ε模型,在模拟计算分离区的流动结构时,有较大的误差。

论文目录

• ABSTRACT
• 摘要
• DEDICATION
• ACKNOWLEDGMENTS
• TABLE OF CONTENTS
• LIST OF FIGURES
• LIST OF TABLE
• NOMENCLATURE
• CHAPTER 1: INTRODUCTION
• 1.1 Introduction
• 1.2 Turbulent Flow and Turbulence Modeling
• 1.3 Physics of Separated Flow
• 1.4 Relevant Past Studies
• 1.5 Experimental Test Case for Validation
• 1.6 Objectives of the present study
• 1.7 Organization of the Thesis
• CHAPTER 2: THE GOVERNING EQUATIONS
• 2.1 Introduction
• 2.2 Instantaneous Mass and Momentum Conservation Equations
• 2.3 Averaged Mass and Momentum Conservation Equations
• 2.3.1 Averaging Procedure
• 2.4 Turbulence Modeling
• 2.4.1 Standard k-ε Model
• 2.4.2 Standard k-ω Model
• 2.4.3 Shear Stress Transport Model
• 2.5 Near Wall Treatment
• 2.6 Comparison of Different Turbulence Models
• CHAPTER 3: COMPUTATIONAL METHODOLOGY
• 3.1 Introduction
• 3.2 Essential Steps in a CFD Analysis
• 3.2.1 Problem Formulation
• 3.2.2 Mesh Generation
• 3.2.3 Flow Specification
• 3.2.4 Calculation of the Numerical Solution
• 3.2.5 Analysis of Results
• 3.3 Description of the Numerical Domain
• 3.3.1 Geometry Description
• 3.3.2 Mesh Generation
• 3.4 Solver Overview
• 3.5 Defining the Boundary Conditions
• 3.5.1 Inlet
• 3.5.2 Other
• 3.6 Convergence Criterion
• CHAPTER 4: NUMERICAL RESULTS AND DISCUSSION
• 4.3 Static Pressure along the Blade Surface
• 4.1.1 Static Pressure Coefficient Distribution
• 4.1.2 Grid Independence
• 4.2 Boundary Layer Development
• 4.2.1 Comparing Velocities on the Blade
• 4.2.1.1 Blade Suction Side
• 4.2.1.2 Blade Pressure Side
• 4.2.2 Blade Wake Velocities
• 4.3 Turbulence Level
• 4.4 Three-dimensional Flow Structure
• 4.4.1 Computational Grid
• 4.4.2 Static Pressure Coefficient Distribution
• CHAPTER 5: CONCLUSION AND RECOMMENDATIONS
• 5.1 Concluding Remark
• 5.2 Recommendations for Future Work
• APPENDIX A- FUNDAMENTALS OF CASCADE AERODYNAMICS
• APPENDIX B - FURTHER RESULTS