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Design Parameters and Dynamic Characteristics of a Fluidic Valve

이지웅

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This thesis focuses on the fluidic valve for the airfoil to control the boundary layer. The experiment and the numerical analysis were conducted to investigate the dynamic characteristics and the design parameters. For the experiments, the fluidic valve was manufactured by acryl, and the experiment...
This thesis focuses on the fluidic valve for the airfoil to control the boundary layer. The experiment and the numerical analysis were conducted to investigate the dynamic characteristics and the design parameters. For the experiments, the fluidic valve was manufactured by acryl, and the experimental equipment was setup for the experiments. The experimental setup has been upgraded once because the control pressure was not stable with the original experimental setup. Also, the experimental sequence was chosen for the best results. The minimum pressure ratio, the minimum mass flow rate ratio, and the response time were determined, and the experimental data was analyzed. The numerical method was carried out to figure out the principle of switching direction of the main flow. Therefore, the physical model and computational domain were built and calculated by FLUENT. The Reynolds-Averaged Navier-Stokes equations (RANS) is used to visualize and investigate the complex turbulent flow structure at the intersection of the main and control flows inside the fluidic valve. The Realizable k-ε model is implemented, and the standard wall functions is used for the near-wall treatment.
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CHAPTER 1. PREFACE 1
CHAPTER 2. INTRODUCTION 2
2.1 Motivation and Objectives 2
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CHAPTER 1. PREFACE 1
CHAPTER 2. INTRODUCTION 2
2.1 Motivation and Objectives 2
2.2 Literature Review 6
CHAPTER 3. EXPERIMENTS 8
3.1 Configuration of Fluidic Valve 8
3.2 Experimental Setup 11
3.2.1 Original Experimental Setup 11
3.2.2 Upgraded Experimental Setup 14
3.3 Experimental Sequence 16
CHAPTER 4. NUMERICAL METHOD 18
4.1 Physical Model and Computational Domain 18
4.2 Computational Method 21
CHAPTER 5. RESULTS 22
5.1 Operating Principle of Fluidic Valve 22
5.2 Observation of Switching Direction 25
5.3 Effect of Break Time 26
5.4 Effective PWM Signal 29
5.5 Pressure Change Observation 32
5.6 Effect of Different Control Nozzle Widths 34
5.7 Effect of Different Heights of Fluidic Valve 39
CHAPTER 6. CONCLUSIONS 42
REFERENCES 44
요 약 47