ContentsContents

Chapter 1Introduction1

1.1The Phenomena of Laminar Separation Bubble1

1.2Consequences of LSB2

1.3Effect on Turbomachinery3

1.4Brief Summary of Previous Research4

1.5Objectives of the Thesis7

Chapter 2Fundamentals of Boundary Layer Theory10

2.1Boundary Layer Concept11

2.2Boundary Layer on a Flat Plate at Zero Incidence14

2.3Boundary Layer on an Airfoil19

2.4Boundary Layer Separation20

2.5Boundary Layer Integral Parameters23

2.6Transition Mechanisms26

2.7Stability Theory33

Chapter 3Numerical Method35

3.1Governing Equations36

3.2RANS Simulation37

3.3Turbulence and Transition Models40

3.4Unsteady RANS (URANS) Simulation51

3.5Summary52

Chapter 4Experimental Research of LSB53

4.1Introduction53

4.2Test Section55

4.3Measurements Setting and Test Matrix57

4.4Phenomenological Analysis of Transition Mechanisms59

4.5Summary67

Chapter 5Numerical Investigation of LSB68

5.1Introduction68

5.2Computational Domain and Mesh Independency68

5.3Mathematical Scheme71

5.4Validation of Turbulence Models71

5.5Analysis of RANS Results77

5.6Analysis of URANS Results97

5.7Summary118

Chapter 6Conclusions120

Nomenclature122

Appendix A125

Appendix B128

References131