This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Formaldehyde Visualization Near Lift-off Location in a Diesel Jet
Technical Paper
2006-01-3434
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Formaldehyde (HCHO) near the lift-off location in a reacting diesel jet was visualized using planar laser-induced fluorescence (PLIF). Simultaneous imaging of OH chemiluminescence identified the high-temperature combustion region (lift-off). Experiments were performed in a constant-volume combustion vessel at ambient gas conditions (temperature and oxygen concentration) that generate no-soot, low-soot and moderate-soot diesel jets during mixing-controlled combustion. For no-soot conditions, results show that HCHO is formed upstream of the lift-off location and is consumed downstream of the lift-off length in fuel-rich premixed reaction zones at the jet center. Despite the fuel-rich combustion, and downstream regions that are surrounded by a high-temperature diffusion flame, there is no detectable PAH formation in the no-soot condition. For low-soot conditions (achieved by increasing the ambient temperature), HCHO is formed upstream of the lift-off length, consumed downstream of the lift-off length at the jet center, followed by PAH and soot formation. However, there is a distinct separation between the region of HCHO consumption and PAH formation. As ambient temperature is increased further to produce moderate-soot fuel jets, the axial location of HCHO formation is essentially coincident with the lift-off length and it is harder to distinguish between HCHO and PAH downstream. The general trends above apply to different ambient oxygen concentrations, but the axial and radial positions are elongated at low ambient oxygen. Experimental results were analyzed using a two-reactor (TSL) model for detailed chemistry in turbulent jets. A conceptual model of reacting diesel jets is proposed that includes cool-flame chemistry effects upstream of the lift-off length and the rich, premixed reaction zone at the jet center.
Recommended Content
Authors
Topic
Citation
Idicheria, C. and Pickett, L., "Formaldehyde Visualization Near Lift-off Location in a Diesel Jet," SAE Technical Paper 2006-01-3434, 2006, https://doi.org/10.4271/2006-01-3434.Also In
References
- Siebers, D.L. Higgins, B.S. “Flame Lift-off on Direct-Injection Diesel Sprays under Quiescent Conditions,” SAE Paper 2001-01-0530 2001
- Pickett, L.M. Siebers, D.L. “Soot in Diesel Fuel Jets: Effects of Ambient Temperature, Ambient Density, and Injection Pressure,” Combust. Flame 138 114 2004
- Ito, T. Kitamura, T. Ueda, M. Matsumoto, T. Senda, J. Fujimoto, H. “Effects of Flame Lift-Off and Flame Temperature on Soot Formation in Oxygenated Fuel Sprays,” SAE 2003-01-0073 2003
- Musculus, M.P.B. “Effects of the In-Cylinder Environment on Diffusion Flame Lift-Off in a DI Diesel Engine,” SAE Paper 2003-01-0074 2003
- Dec, J.E. “A conceptual model of DI diesel combustion based on laser-sheet imaging,” SAE Paper 970873 1997
- Pickett, L.M. Siebers, D.L. “Soot Formation Near the Lift-Off Length in Mixing-Controlled DI Diesel Fuel Jets,” Int. J. Engine Research 7 103 130 2006
- Pickett, L.M. Siebers, D.L. “Non-Sooting, Low Flame Temperature Mixing-Controlled DI Diesel Combustion,” SAE Paper 2004-01-1399 2004
- Pickett, L.M. Siebers, D.L. Idicheria, C.A. “Relationship Between Ignition Processes and the Lift-Off Length of Diesel Fuel Jets,” SAE Paper 2005-01-3843 2005
- Kosaka, H. Drewes, V. Catalfamo, L. Aradi, A. Iida, N. Kamimoto, T. “Two-Dimensional Imaging of Formaldehyde Formed During the Ignition Process of a Diesel Fuel Spray,” SAE Paper 2000-01-0236 2000
- Aizawa, T. Kosaka, H. Matsui, Y. “Investigation of Early Soot Formation Process in a Transient Spray Flame via Spectral Measurements of Laser-induced Emission,” Conference on Thermo- and Fluid Dynamic Processes in Diesel Engines Valencia, Spain 2004
- Bruneaux, G. Augé, M. Lemenand, C. “A Study of Combustion Structure in High Pressure Single Hole Common Rail Direct Diesel Injection Using Laser Induced Fluorescence of Radicals,” COMODIA 2004 August 2-5 2004 Yokohama, Japan
- Collin, R. Nygren, J. Richter, M. Aldén, M. Hildingsson, L. Johansson, B. “Simultaneous OH- and Formaldehyde-LIF Measurements in an HCCI Engine” SAE Paper 2003-01-3218 2003
- Hildingsson, L. Persson, H. Johansson, B. Collin, R. Nygren, J. Richter, M. Aldén, M. Hasegawa, R. Yanagihara, H. “Optical Diagnostics of HCCI and Low-Temperature Diesel Using Simultaneous 2-D PLIF of OH and Formaldehyde,” SAE Paper 2004-01-2949 2004
- Pickett, L.M. Caton, J.A. Musculus, P.B. Lutz, A.E. “Evaluation of the Equivalence Ratio-Temperature Region of Diesel Soot Precursor Formation Using a Two-Stage Lagrangian Model,” Int. J. of Engine Research 2006
- Engine Combustion Network experimental data archive http://www.ca.sandia.gov/ecn/
- Idicheria, C.A. Pickett, L.M. “Soot Formation in Diesel Combustion under High-EGR Conditions,” SAE Paper 2005-01-3834 2005
- Higgins, B.S. Siebers D.L. “Measurement of the Flame Lift-Off Location on DI Diesel Sprays Using OH Chemiluminescence,” SAE 2001-01-0918 2001
- Naber, J.D. Siebers, D.L. “Effects of Gas Density and Vaporization on Penetration and Dispersion of Diesel Sprays,” SAE Paper 960034 1996
- Berlman, I.B. 0120926563 Handbook of Fluorescence Spectra of Aromatic Molecules Second Academic Press New York London 1971