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Experimental analysis between LIF-OH/355 from IFPEN, SANDIA and TU/e

This workshop aimed to analyze the structure of spray flames and improve measurement and post-processing techniques for more reliable results in future meetings of the Engine Combustion Network. The workshop focused on flame phases, operating conditions, hardware comparisons, and 2D and 1D profiles.

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Experimental analysis between LIF-OH/355 from IFPEN, SANDIA and TU/e

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  1. Experimental analysis between LIF-OH/355 from IFPEN, SANDIA and TU/e • H. Baya Toda, M. Meijer, N. Maes, S. Skeen, L. Pickett, LM, Malbec, G. Bruneaux Third Workshop of the Engine Combustion Network, April 4-5, 2014, Ann Arbor, USA,

  2. Objectives • Analyze the spray flame structure • Assess the repeatability of measurements among different institutions • Improve measurements/post-processing for more reliable results for next ECN meetings

  3. Contents • Flame phases – spray A • Operating conditions for comparisons • Hardware comparisons • 2D and 1D profiles comparisons

  4. Analysis of flame phases – Spray A SOC EOI I II III FL FTP sR sinert LOL OH* LOL(t) Sources of information • Shadowgraphy (CMT) • OH* Chemiluminescence LOL OH* (CMT) • Broadband chemiluminescence • FTP(t) = Flame Tip Penetration (CMT) • LOL(t) (Sandia)

  5. Analysis of flame phases – Spray A SOC EOI I II III FL FTP sR sinert LOL OH* LOL(t) Combustion stages • (I) = Autoignition and early development • From SOC until reacting penetration accelerates over inert case • The reacting spray undergoes a transition from inert to reacting flow

  6. Analysis of flame phases – Spray A SOC EOI I II III FL FTP sR sinert LOL OH* LOL(t) Combustion stages • (II) = Mature flame • From the end of (I) until EOI • (IIA) Transient mature flame – LOL still unsteady (upto 2000 us) • (IIB) Quasi-steady mature flame – LOL steady but FTP increasing (upto 4000 us) • (IIC) Steady flame – FTP steady (FL)

  7. Analysis of flame phases – Spray A SOC EOI I II III FL FTP sR sinert LOL OH* LOL(t) Combustion stages • (III) = Burn-out phase • From EOI onwards

  8. Operating conditions for comparisons SOC EOI I II III FL FTP sR sinert LOL OH* LOL(t) * Assuming an identical hydraulic delay as at IFPEN: 300us

  9. Hardware differences * Measurements were performed with two laser sheets

  10. Flame structure – Spray A Reaction zone Formaldehyde PAH Liquid phase Hot burnt gases The formaldehyde structure decreaseswhenincreasingtempereature/ [O2] The PLIF-OH signal start « almost » at LOL (OH*)

  11. PLIF-355: 2D comparisons PAH Formaldehyde

  12. PLIF-355: 2D comparisons IFPEN SANDIA

  13. PLIF-355: 2D comparisons Formaldehyde

  14. PLIF-OH: 2D comparisons t = 4.7 ms ASOI

  15. Profiles comparison: PLIF-OH

  16. PLIF-OH: 2D comparisons t = 0.7 ms ASOI • Not the samepenetration • Ambient conditions ? • Injector to injector variations ? • Hydraulicdelay ? • Not the same structure ? • Laser profile correction ? • Timing ? • AI delaydifferences ?

  17. PLIF-OH: 2D comparisons t = 0.7 ms ASOI 0.7 ms 0.4 ms 4.7 ms 0.7 - 1 ms

  18. Conclusions • Good agreement for PLIF-355 measurments • Transient (IFPEN and SANDIA) • Steady phase (IFPEN,TU/e and SANDIA) • Good agreement for PLIF-OH measurements at steady state phase • PLIF-OH comparisons during transient phases are more difficult and need more time for investigation • PLIF-OH from TU/e more suitable for LOL estimation because of the stable energy laser

  19. Thank you to all the contributors and good luck to the CFD GUYS !

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