It is known that low-temperature combustion (LTC) strategies can help simultaneously reduce nitrogen oxides (NOx) and particulate matter (PM) emissions from diesel engines to very low levels. However, it is also known that LTC may cause emissions of unburned hydrocarbons (UHC) to rise — especially in low load operating conditions. Recent studies indicate that end-of-injection (EOI) processes may support ignition recession back to injector nozzle thereby helping to reduce these emissions. This paper contributes to the physical understanding of this EOIphe-nomenon, combustion recession, using computational fluid dynamics studies at LTC conditions. Simulations are performed on a single-hole injection of n-dodecane under a range of Engine Combustion Network’s “Spray A” conditions. The primary objective of this paper is to assess the ability of a Flamelet Generated Manifold (FGM) combustion model to predict and characterize combustion recession. First, a baseline condition FGM simulation is compared with two other combustion models namely the Well Stirred model (WSR), the Representative Interactive Flamelet model (RIF) using the commercially-available CFD solver, CONVERGE. Further studies were carried out for FGM model alone including: varying ambient temperature conditions and chemical mechanisms. Two chemical kinetics mechanisms with low temperature chemistry for n-dodecane are employed to help to predict the occurrence of combustion recession. All simulations are performed under the Reynolds-Averaged Navier-Stokes (RANS) framework in a grid-converged Lagrangian spray scenario. The simulation of combustion recession is qualitatively validated against experimental data from literature and the efficacy of each model in predicting combustion recession is evaluated. Overall, it was found that the FGM model was able to capture the combustion recession phenomenon well — showing particular strength in predicting distinct auto-ignition events in the near nozzle region.
Skip Nav Destination
ASME 2018 Internal Combustion Engine Division Fall Technical Conference
November 4–7, 2018
San Diego, California, USA
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
978-0-7918-5199-9
PROCEEDINGS PAPER
Numerical Studies of Combustion Recession on ECN Diesel Spray A Available to Purchase
Xiaohang Fang,
Xiaohang Fang
University of Oxford, Oxford, UK
Search for other works by this author on:
Riyaz Ismail,
Riyaz Ismail
University of Oxford, Oxford, UK
Search for other works by this author on:
Martin H. Davy,
Martin H. Davy
University of Oxford, Oxford, UK
Search for other works by this author on:
Joseph Camm
Joseph Camm
Loughborough University, Loughborough, UK
Search for other works by this author on:
Xiaohang Fang
University of Oxford, Oxford, UK
Riyaz Ismail
University of Oxford, Oxford, UK
Martin H. Davy
University of Oxford, Oxford, UK
Joseph Camm
Loughborough University, Loughborough, UK
Paper No:
ICEF2018-9597, V002T06A011; 13 pages
Published Online:
January 3, 2019
Citation
Fang, X, Ismail, R, Davy, MH, & Camm, J. "Numerical Studies of Combustion Recession on ECN Diesel Spray A." Proceedings of the ASME 2018 Internal Combustion Engine Division Fall Technical Conference. Volume 2: Emissions Control Systems; Instrumentation, Controls, and Hybrids; Numerical Simulation; Engine Design and Mechanical Development. San Diego, California, USA. November 4–7, 2018. V002T06A011. ASME. https://doi.org/10.1115/ICEF2018-9597
Download citation file:
85
Views
Related Proceedings Papers
Related Articles
Simulation of Combustion Recession After End-of-Injection at Diesel Engine Conditions
J. Eng. Gas Turbines Power (October,2017)
Comparisons of Diesel PCCI Combustion Simulations Using a Representative Interactive Flamelet Model and Direct Integration of CFD With Detailed Chemistry
J. Eng. Gas Turbines Power (January,2007)
Modeling Diesel Spray Flame Liftoff, Sooting Tendency, and NO x Emissions Using Detailed Chemistry With Phenomenological Soot Model
J. Eng. Gas Turbines Power (January,2007)
Related Chapters
Development of New Process and Product Monitoring Technologies for the Manufacturing of High Value Alloy Steels for Use in Critical Applications
Bearing and Transmission Steels Technology
Determination of the Effects of Safflower Biodiesel and Its Blends with Diesel Fuel on Engine Performance and Emissions in a Single Cylinder Diesel Engine
International Conference on Software Technology and Engineering, 3rd (ICSTE 2011)
Outlook
Closed-Cycle Gas Turbines: Operating Experience and Future Potential