Journal article
Characterisation of two-stage ignition in diesel engine-relevant thermochemical conditions using direct numerical simulation
A Krisman, ER Hawkes, M Talei, A Bhagatwala, JH Chen
Combustion and Flame | ELSEVIER SCIENCE INC | Published : 2016
Abstract
With the goal of providing a more detailed fundamental understanding of ignition processes in diesel engines, this study reports analysis of a direct numerical simulation (DNS) database. In the DNS, a pseudo turbulent mixing layer of dimethyl ether (DME) at 400 K and air at 900 K is simulated at a pressure of 40 atmospheres. At these conditions, DME exhibits a two-stage ignition and resides within the negative temperature coefficient (NTC) regime of ignition delay times, similar to diesel fuel. The analysis reveals a complex ignition process with several novel features. Autoignition occurs as a distributed, two-stage event. The high-temperature stage of ignition establishes edge flames that ..
View full abstractGrants
Awarded by U.S. Department of Energy
Funding Acknowledgements
This work was supported by the Australian Research Council. The work at Sandia National Laboratories was supported by the Combustion Energy Frontier Research Center, an Energy Frontier Research Center funded by the US Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences under Award no. DE-SC0001198. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy under contract DE-AC04-94AL85000. The research was supported by computational resources on the Australian NCI National Facility through the National Computational Merit Allocation Scheme and Intersect Australia partner share and by resources at the Pawsey Supercomputing Centre.