1 / 19

Laser Induced Incandescence Diagnostic For Soot Measurements

S P A C E Structures, Propulsion, And Control Engineering C e n t e r. Laser Induced Incandescence Diagnostic For Soot Measurements. Faculty Advisors Dr. Pham 1 Professor Dunn-Rankin 2. Student Assistants Michael Tran 2.

anahid
Download Presentation

Laser Induced Incandescence Diagnostic For Soot Measurements

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. S P A C E Structures, Propulsion, And Control Engineering C e n t e r Laser Induced Incandescence Diagnostic For Soot Measurements Faculty Advisors Dr. Pham1 Professor Dunn-Rankin2 Student Assistants Michael Tran2 1) California State University, Los Angeles, CA 90023 2) University of California, Irvine, CA 92697 NASA Grant URC NCC NNX08BA44A

  2. PRESENTATION OUTLINE • Soot Background • Diagnostic Techniques • Laser Induced Incandescence (LII) • My Research • Future Work 10/1/2009 NASA Grant URC NCC NNX08BA44A

  3. SOOT BACKGROUND Soot Aggregates • 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 Transmission Electron Microscopy (TEM)- Lund University) 10/1/2009 NASA Grant URC NCC NNX08BA44A

  4. SOOT BACKGROUND 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 10/1/2009 NASA Grant URC NCC NNX08BA44A

  5. 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 LIIScience.org Sampling Technique, Florida International University 10/1/2009 NASA Grant URC NCC NNX08BA44A 5

  6. 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 NASA Grant URC NCC NNX08BA44A 6

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

  8. 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 NASA Grant URC NCC NNX08BA44A 8

  9. 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 NASA Grant URC NCC NNX08BA44A 9

  10. EXPERIMENTAL SET UP A K C B F G E I H D J 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 NASA Grant URC NCC NNX08BA44A 10

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

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

  13. 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 Iso-octane 10/1/2009 NASA Grant URC NCC NNX08BA44A 13

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

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

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

  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 10/1/2009 NASA Grant URC NCC NNX08BA44A 17

  18. ACKNOWLEDGMENTS Grant provide by NASA # NNX08BA44A Lasers, Flames, Aerosols Laboratory, UCI Space Center, CSLA 10/1/2009 NASA Grant URC NCC NNX08BA44A 18

  19. QUESTIONS 10/1/2009 NASA Grant URC NCC NNX08BA44A 19

More Related