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Laser Induced Incandescence Diagnostic For Soot Measurements Faculty Advisors Dr. Pham 1 Professor Dunn-Rankin 2 Student Assistants Michael Tran 2 10/1/2009NASA.

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Presentation on theme: "Laser Induced Incandescence Diagnostic For Soot Measurements Faculty Advisors Dr. Pham 1 Professor Dunn-Rankin 2 Student Assistants Michael Tran 2 10/1/2009NASA."— Presentation transcript:

1 Laser Induced Incandescence Diagnostic For Soot Measurements Faculty Advisors Dr. Pham 1 Professor Dunn-Rankin 2 Student Assistants Michael Tran 2 10/1/2009NASA Grant URC NCC NNX08BA44A1 1) California State University, Los Angeles, CA 90023 2) University of California, Irvine, CA 92697

2 PRESENTATION OUTLINE Soot Background Diagnostic Techniques Laser Induced Incandescence (LII) My Research Future Work NASA Grant URC NCC NNX08BA44A210/1/2009

3 3NASA Grant URC NCC NNX08BA44A SOOT BACKGROUND Soot- Carbonaceous solid particles due to incomplete combustion Main constituents are carbon (97- 99%) and hydrogen (1-3%) by wt. Individual Soot Particles 10-50nm Soot Aggregates Transmission Electron Microscopy (TEM)- Lund University) 10/1/2009

4 4NASA Grant URC NCC NNX08BA44A Environmental and health aspects of soot Contributes to 25% of global warming Climate change Particles < 1 micron can enter human respiratory system Benefits in soot Carbon Black Tire industry Ink Air Pollution in Los Angeles, Time Magazine SOOT BACKGROUND 10/1/2009

5 5NASA Grant URC NCC NNX08BA44A DIAGNOSTIC TECHNIQUES Probe techniques Gravimetric Sampling Disadvantage: Intrusive, limited in spatial resolution and temporal response Laser Diagnostics Laser Induced Incandescence Advantage: Non-intrusive Disadvantage: Optical access and expensive Sampling Technique, Florida International University LIIScience.org 10/1/2009

6 6NASA Grant URC NCC NNX08BA44A LASER INDUCED INCANDESCENCE Goal: Qualitative and quantitative measurement of soot Output: Soot profile, soot volume fractions, and particle size Principle: –Soot is heated by laser (3500-4000K) –Incandescence flame images  soot profile –Incandescence intensity  soot volume fraction –Temporal decay of incandescence  particle size Laser Induced Incandescence, Lund University 10/1/2009

7 7NASA Grant URC NCC NNX08BA44A LII THEORY Lund University 10/1/2009

8 8NASA Grant URC NCC NNX08BA44A TYPICAL LII COMPONENTS Laser UV to visible light (532nm) to IR (1064nm) Detector ICCD Camera Photomultiplier Tube Soot Generator Flame Engine Combustor Lund University Trigger Mechanism Function generator Filter Filter range 300-600nm (400nm preferred) 10/1/2009

9 9NASA Grant URC NCC NNX08BA44A MY RESEARCH Goal Compare sooting characteristics of neat and various blends of biodiesel to diesel fuel in a diffusion candle flame and counter flow flame using Laser Induced Incandescence 10/1/2009

10 10NASA Grant URC NCC NNX08BA44A EXPERIMENTAL SET UP A B C D E F G H I J K A 532 Nd:Yag Laser B Mechanical Iris C/D Beam Steering Optic E/F Cylindrical Lens G Candle Flame H 532nm Nd:Yag Dielectric Mirror I 320nm Band-pass Filter J ICCD Camera K Beam Stopper Photodiode (Not Labeled) 10/1/2009

11 11NASA Grant URC NCC NNX08BA44A EXPERIMENTAL SET UP Camera Control Unit Oscilloscope Function Generator ICCD Camera Photodiode 10/1/2009

12 12NASA Grant URC NCC NNX08BA44A RESULTS AND ANALYSIS Iso-octane Diesel Biodiesel Flame images captured by hand-held digital camera 10/1/2009

13 13NASA Grant URC NCC NNX08BA44A RESULTS AND ANALYSIS Flame image of iso-octane captured by ICCD camera (No laser) Laser induced incandescence of iso-octane captured by ICCD camera Iso-octane 10/1/2009

14 14NASA Grant URC NCC NNX08BA44A RESULTS AND ANALYSIS Laser induced-incandescence images captured by ICCD camera Iso-octane Diesel Biodiesel 10/1/2009

15 15NASA Grant URC NCC NNX08BA44A RESULTS AND ANALYSIS Flame intensity profile (incandescence) Laser Induced incandescence profile Note: Intensity not scaled Iso-octane Diesel Bio-diesel 10/1/2009

16 16NASA Grant URC NCC NNX08BA44A RESULTS AND ANALYSIS Normalized intensity contour plot Iso-octane Iso-octane Diesel Biodiesel (incandescence) (induced incandescence) (induced incandescence) (induced incandescence) 10/1/2009

17 FUTURE WORK Collect data holding constant flame height Obtain quantitative measurement (soot volume fraction and particle size distributions) Compare soot formation in diffusion candle flame versus counter flow flame NASA Grant URC NCC NNX08BA44A1710/1/2009

18 ACKNOWLEDGMENTS Grant provide by NASA # NNX08BA44A Lasers, Flames, Aerosols Laboratory, UCI Space Center, CSLA NASA Grant URC NCC NNX08BA44A1810/1/2009

19 QUESTIONS NASA Grant URC NCC NNX08BA44A1910/1/2009

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