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Schlieren Visualization Method Team Members: Christopher Rauda Richard Nguyen Henry Luong Advisors: Dr. Trinh Pham Dr. Darrell Guillaume Combustion Project Non-Reactive Flow Visualization Schlieren Reactive Flow Visualization Exhaust Particulates Overview Project Objective Background Current Set Up Progress Questions Project Objective To make a relationship between the Schlieren method and swirl number. Background The strong favorable effects of applying swirl to injected air and fuel are used to stabilize the high intensity combustion process and an efficient clean combustion Swirl is characterized by S = G φ / Gz r o Where Gφ and Gz are tangential and axial momentum Swirl number calculation approaches aUniversity of Patras, Department of Mechanical Engineering and Aeronautics, Laboratory of Applied Thermodynamics, Greece Background What is Schlieren? ♦ Schlieren method illustrates density gradients. ♦ This method utilizes optical mirrors and lenses to produce an image. ♦ These are the range in densities found within the flow. Z-Type Schlieren Schlieren Setup Slit Condenser lense Parabolic Mirrors Light Source Current Progress Successful Schlieren set up Construction of flow meter mount Installation of pressure gages Created connection of tubing to combustion chamber ♦ Air ♦ Fuel Initial test of combustion chamber Video Questions Non-Reactive Flow Visualization Joe Ortega Ana Ramos Ana Siu Duc Do Advisors: Dr. Trinh Pham Dr. Darrell Guillaume Overview Background Objective Equipment Setup Progress Future Work Background Non Reactive Flow ♦ Making transparent fluid flow visible without combustion Non-reactive flow visualization consists of laser tomography – imaging technique used to create “laser sheet” to “light” fluid flow Using this method to appreciate the flow structures and compare with reactive flow Objective To produce visual-flow field using: ♦ Laser ♦ Materials To capture field with a camera To analyze the images captured Setup Equipment Laser/Optics Table Setup ♦ Melles Griot 35 mW-head Laser Red Dot ♦ ♦ ♦ ♦ ♦ ♦ ♦ Laser Stop Laser Barrier Laser Mount Glass Rods Glass-Rod Support Tin Cans as mixing and combustion chamber prototypes Flow Meter Laser Flow Visualization Schematic The simplest method of visualizing flow structures Glass Rod Test area Laser Laser Mounts Laser Sheet Optics Table Combustion Chamber Laser stop Barrier Setup Barrier Laser stop Power Box Laser Accomplishments Tested Laser beam through different materials ♦ Smoke Bombs ♦ Dry Ice ♦ Incense Sticks Partially Constructed Air-Smoke Mixing Chamber ♦ Used Incense Dry Ice and Incense Experiments Short-Term Goals Complete Air-Smoke Mixing Chamber Test Mixing Chamber with prototype chamber Acknowledgements Dr. Trinh Pham Dr. Darrell Guillaume Christopher Reid Juan Pablo Barquero Tawana Guillaume Robert Aguilar Gustavo Aceves NASA CSULA Combustion Team
