Schlieren Visualization Method Team Members: Christopher Rauda Richard Nguyen Henry Luong Advisors: Dr. Trinh Pham Dr. Darrell Guillaume

Combustion Project ExhaustParticulatesSchlierenReactiveFlowVisualizationNon-ReactiveFlowVisualization

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 / G z r o Where G φ and G z are tangential and axial momentum  Swirl number calculation approaches a University 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 Parabolic Mirrors Condenser lense Light Source Slit

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 Laser Glass Rod Laser Sheet BarrierLaser stop Test area Combustion Chamber Optics TableLaser Mounts

Setup Power Box Laser Laser stop Barrier

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