This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Comparing Large Eddy Simulation of a Reacting Fuel Spray with Measured Quantitative Flame Parameters
Technical Paper
2018-01-1720
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
In order to reduce engine out CO2 emissions, it is a main subject to find new alternative fuels from renewable sources. For identifying the specification of an optimized fuel for engine combustion, it is essential to understand the details of combustion and pollutant formation. For obtaining a better understanding of the flame behavior, dynamic structure large eddy simulations are a method of choice. In the investigation presented in this paper, an n-heptane spray flame is simulated under engine relevant conditions starting at a pressure of 50 bar and a temperature of 800 K. Measurements are conducted at a high-pressure vessel with the same conditions. Liquid penetration length is measured with Mie-Scatterlight, gaseous penetration length with Shadowgraphy and lift-off length as well as ignition delay with OH*-Radiation. In addition to these global high-speed measurement techniques, detailed spectroscopic laser measurements are conducted at the n-heptane flame. Spontaneous Raman scattering is used to measure temperature and oxygen concentration, whereas laser-induced fluorescence is applied to measure quantitative nitrogen concentrations. The LES-simulation matches the parameters’ liquid penetration length, gaseous penetration length and lift-off-length as well as ignition delay very well. Concerning the detailed flame parameters, it can be seen in the measurements that adiabatic flame temperatures are achieved in the center of the flame kernel. The NO concentrations measured in the jet core can be compared to 0-d-constant-pressure simulations, taking the residence time of the fluid parcels in the main reaction zone into account. When these measurements are compared to the results of the LES-simulations, it is obvious that the turbulence formation in the simulation is different from the measurement. A higher amount of oxygen is predicted in the flame kernel and the adiabatic flame temperature is not reached in the middle of the flame.
Recommended Content
| Technical Paper | Cold Start Simulation and Test on DISI Engines Utilizing a Multi-Zone Vaporization Approach |
| Technical Paper | Experimental Characterization of DI Gasoline Injection Processes |
Topic
Citation
Ottenwaelder, T. and Pischinger, S., "Comparing Large Eddy Simulation of a Reacting Fuel Spray with Measured Quantitative Flame Parameters," SAE Technical Paper 2018-01-1720, 2018, https://doi.org/10.4271/2018-01-1720.Also In
References
- Raffius , T. , Schulz , C. , Ottenwälder , T. , Grünefeld , G. et al. Flame-Temperature, Light-Attenuation, and CO Measurements by Spontaneous Raman Scattering in Non-Sooting Diesel-Like Jets Combustion and Flame 176 104 116 2017
- Ottenwälder , T. , Schulz , C. , Raffius , T. , Koß , H.-J. et al. Quantitative Nitrogen Oxide Measurements by Laser-Induced Fluorescence in Diesel-Like n-Heptane Jets with Enhanced Premixing Combustion and Flame 188 250 261 2018
- Ottenwaelder , T. and Pischinger , S. Effects of Biofuels on the Mixture Formation and Ignition Process in Diesel-Like Jets SAE Technical Paper 2017-01-2332 2017
- Jakob , M. , Hülser , T. , Janssen , A. , Adomeit , P. et al. Simultaneous High-Speed Visualization of Soot Luminosity and OH∗ Chemiluminescence of Alternative-Fuel Combustion in a HSDI Diesel Engine under Realistic Operating Conditions Combustion and Flame 159 7 2516 2529 2012
- Huelser , T. , Jakob , M. , Gruenefeld , G. , Adomeit , P. et al. Optical Investigation of Fuel and In-Cylinder Air-Swirl Effects in a High-Speed Direct-Injection Engine International Journal of Engine Research 16 6 716 737 2015
- Xue , Q. , Som , S. , Senecal , P. , and Pomraning , E. Large Eddy Simulation of Fuel-Spray under Non-Reacting IC Engine Conditions Atomiz Spr 23 10 925 955 2013
- Wehrfritz , A. , Vuorinen , V. , Kaario , O. , and Larmi , M. Large Eddy Simulation of High-Velocity Fuel Sprays: Studying Mesh Resolution and Breakup Model Effects for Spray A Atomiz Spr 23 5 419 442 2013
- Vuorinen , V. , Hillamo , H. , Kaario , O. , Larmi , M. et al. Large Eddy Simulation of Droplet Stokes Number Effects on Turbulent Spray Shape Atomiz Spr 20 2 93 114 2010
- Rutland , C. Large-Eddy Simulations for Internal Combustion Engines - A Review International Journal of Engine Research 12 5 421 451 2011
- Som , S. , Longman , D. , Luo , Z. , Plomer , M. et al. Simulating Flame Lift-Off Characteristics of Diesel and Biodiesel Fuels Using Detailed Chemical-Kinetic Mechanisms and Large Eddy Simulation Turbulence Model J. Energy Resour. Technol. 134 3 32204 2012
- Tillou , J. , Michel , J.-B. , Angelberger , C. , and Veynante , D. Assessing LES Models Based on Tabulated Chemistry for the Simulation of Diesel Spray Combustion Combustion and Flame 161 2 525 540 2014
- Gong , C. , Jangi , M. , and Bai , X.-S. Large Eddy Simulation of n-Dodecane Spray Combustion in a High Pressure Combustion Vessel Applied Energy 136 373 381 2014
- Bekdemir , C. , Somers , L. , de Goey , L. , Tillou , J. , and Angelberger , C. Predicting Diesel Combustion Characteristics with Large-Eddy Simulations Including Tabulated Chemical Kinetics Proceedings of Combustion Institute 34 2 3067 3074 2013
- Pei , Y. , Som , S. , Pomraning , E. , Senecal , P. et al. Large Eddy Simulation of a Reacting Spray Flame with Multiple Realizations under Compression Ignition Engine Conditions Combustion and Flame 162 12 4442 4455 2015
- Schulz , C. , Ottenwaelder , T. , Raffius , T. , Brands , T. et al. Nitric Oxide Measurements in the Core of Diesel Jets Using a Biofuel Blend SAE Int. J. Mater. Manf 8 2 2015
- Ottenwaelder , T. , Raffius , T. , Schulz , C. , Adomeit , P. et al. Optical Investigation of Biofuel Effects on NO and PAH Formation in Diesel-like Jets SAE Technical Paper 2015-24-2485 2015 10.4271/2015-24-2485
- Jörg , C. and Zubel , M. 2016
- Som , S. and Aggarwal , S. Effects of Primary Breakup Modeling on Spray and Combustion Characteristics of Compression Ignition Engines Combustion and Flame 157 6 1179 1193 2010
- Patterson , M. and Reitz , R. Modeling the Effects of Fuel Spray Characteristics on Diesel Engine Combustion and Emission SAE Technical Paper 980131 1998 10.4271/980131
- Cai , L. , Pitsch , H. , Mohamed , S. , Raman , V. et al. Optimized Reaction Mechanism Rate Rules for Ignition of Normal Alkanes Combustion and Flame 173 468 482 2016
- Palmer , J. 2017
- Cai , L. and Pitsch , H. Optimized Chemical Mechanism for Combustion of Gasoline Surrogate Fuels Combustion and Flame 162 5 1623 1637 2015
- Lawrence Livermore National Laboratory n-Heptane, Detailed Mechanism https://combustion.llnl.gov/mechanisms/alkanes/n-heptane-detailed-mechanism-version-3
- Zhang , K. , Banyon , C. , Bugler , J. , Curran , H. et al. An Updated Experimental and Kinetic Modeling Study of N-Heptane Oxidation Combustion and Flame 172 116 135 2016
- Cai , L. and Pitsch , H. Mechanism Optimization Based on Reaction Rate Rules Combustion and Flame 161 2 405 415 2014
- Heufer , K. and Minnwegen , H. 2017
- Musculus , M. , Miles , P. , and Pickett , L. Conceptual Models for Partially Premixed Low-Temperature Diesel Combustion Progress in Energy and Combustion Science 39 2-3 246 283 2013
- Raffius , T. , Schulz , C. , Ottenwälder , T. , Grünefeld , G. et al. Fuel 2017