Schlieren Visualization Method

Team Members:Christopher Rauda

Richard NguyenHenry Luong

Advisors:Dr. Trinh PhamDr. Darrell Guillaume

Combustion ProjectCombustion Project

ExhaustExhaustParticulatesParticulates

SchlierenSchlierenReactive Reactive

Flow Flow VisualizationVisualization

Non-ReactiveNon-ReactiveFlowFlow

VisualizationVisualization

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 = Gφ / Gz ro

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

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 OrtegaAna Ramos

Ana SiuDuc 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