致谢
NOMENCLATURE
LIST OFTABLES
LIST OF FIGURES
CHAPTER 1 INTRODUCTION
1.1 Background
1.2Literature review
1.3 Objectives
1.4Thesis outline
CHAPTER 2 NUMERICAL METHOD
2.1Governing equations
2.2Dynamic mesh method
2.2.1 Smoothing
2.2.2 Re-meshing
2.3 Numerical verification
2.3.1Mesh independence
2.3.2Comparison of wake structure
2.3.3Comparison of mean streamwise velocities
2.3.4Comparison of mean streamwise forces
CHAPTER 3 RESULTS AND DISSCUSSION
3.1Jtrail result
3.2Range of pitching amplitude and frequency
3.3Input power coefficient
3.4Thrust coefficient
3.4.1Thrust coefficient of singleandupstream airfoil
3.4.2Thrust coefficient of upstreamanddownstream airfoil
3.4.3Thrust coefficient of two-airfoil system
3.5Thrust efficiency
3.6Work done of the free pitching airfoil
3.7Study of optimal case
3.7.1Time traces of optimal case
3.7.2Thrustenhancementof optimal case
3.8Effect of pitching amplitude
3.8.1Thrust efficiency
3.8.2Instantaneous forces of upstream airfoil
3.8.3Instantaneous forces of downstream airfoil
3.8.4Vorticity contours
3.8.5Pressure contours
3.8.6Time-averaged streamwise velocity
3.8.7Amplitude responseof the downstream airfoil
3.9Effect of pitching frequency
3.9.1Thrust efficiency
3.9.2Instantaneous forces of upstream airfoil
3.9.3Instantaneous forces of downstream airfoil
3.9.4 Vorticity contours
3.9.5Pressure contours
3.9.6Amplitude response of the downstream airfoil
CONCLUSIONS
参考文献
声明
