Numerical Study on the Characteristics of Vaporization, Ignition, and Turbulent Combustion Processes in Dimethyl Ether (DME)-Fueled Engine Conditions

2008 ◽  
Vol 22 (6) ◽  
pp. 3649-3660 ◽  
Author(s):  
Yongwook Yu ◽  
Sungmo Kang ◽  
Yongmo Kim ◽  
Kwan-Soo Lee
Keyword(s):  
Dimethyl Ether ◽  
Turbulent Combustion ◽  
Numerical Study ◽  
Combustion Processes

Numerical Study on Spray Combustion Processes inn-Heptane and Dimethyl Ether Fueled Diesel Engines

2009 ◽  
Vol 23 (10) ◽  
pp. 4917-4930 ◽  
Author(s):  
Yongwook Yu ◽  
Sungmo Kang ◽  
Yongmo Kim ◽  
Kwan-Soo Lee
Keyword(s):  
Dimethyl Ether ◽  
Diesel Engines ◽  
Numerical Study ◽  
Spray Combustion ◽  
Combustion Processes

NUMERICAL STUDY OF POROUS MEDIA TURBULENT COMBUSTION IN A RECUPERATIVE REACTOR

2016 ◽  
Vol 19 (11) ◽  
pp. 941-953 ◽  
Author(s):  
Pablo Donoso-Garcia ◽  
Luis Henriquez-Vargas
Keyword(s):  
Porous Media ◽  
Turbulent Combustion ◽  
Numerical Study

Assessment of Turbulent Combustion Models for Simulating Pre-Chamber Ignition in a Natural Gas Engine

2021 ◽  
Author(s):  
Joohan Kim ◽  
Riccardo Scarcelli ◽  
Sibendu Som ◽  
Ashish Shah ◽  
Munidhar Biruduganti ◽  
...  
Keyword(s):  
Natural Gas ◽  
Turbulent Combustion ◽  
High Efficiency ◽  
Turbulent Flame ◽  
Spark Ignition ◽  
Cylinder Wall ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Combustion Models ◽  
Combustion Processes

Abstract Lean combustion in an internal combustion engine is a promising strategy to increase thermal efficiency by leveraging a more favorable specific heat ratio of the fresh mixture and simultaneously suppressing the heat losses to the cylinder wall. However, unstable ignition events and slow flame propagation at fuel-lean condition lead to high cycle-to-cycle variability and hence limit the high-efficiency engine operating range. Pre-chamber ignition is considered an effective concept to extend the lean operating limit, by providing spatially distributed ignition with multiple turbulent flame-jets and enabling faster combustion rate compared to the conventional spark ignition approach. From a numerical modeling perspective, to date, still the science base and available simulation tools are inadequate for understanding and predicting the combustion processes in pre-chamber ignited engines. In this paper, conceptually different RANS combustion models widely adopted in the engine modeling community were used to simulate the ignition and combustion processes in a medium-duty natural gas engine with a pre-chamber spark-ignition system. A flamelet-based turbulent combustion model, i.e., G-equation, and a multi-zone well-stirred reactor model were employed for the multi-dimensional study. Simulation results were compared with experimental data in terms of in-cylinder pressure and heat release rate. Finally, the analysis of the performance of the two models is carried out to highlight the strengths and limitations of the two formulations respectively.

Comparison of Combustion Models in Cleanroom Fire

2008 ◽  
Vol 24 (3) ◽  
pp. 267-275 ◽  
Author(s):  
Y.-L. Huang ◽  
H.-R. Shiu ◽  
S.-H. Chang ◽  
W.-F. Wu ◽  
S.-L. Chen
Keyword(s):  
Turbulent Combustion ◽  
Global Radiation ◽  
Turbulence Models ◽  
Fire Simulation ◽  
Smoke Control ◽  
Radiation Model ◽  
Combustion Models ◽  
Radiation Heat Exchange ◽  
Computational Fluid Dynamics Cfd ◽  
Combustion Processes

AbstractIn this paper, the cleanroom fire simulation in a semi-conductor factory is investigated by using the commercial computational fluid dynamics (CFD) code. We using three different combustion models in the fire simulation. The combustion models including the volume heat source (VHS) model, the eddy break-up (EBU) model and the presumed probability density function (prePDF) model are considered to predict the cleanroom fire. The turbulence models coupled with different combustion models, while the radiation model is coupled with the turbulent combustion processes. Additionally, the discrete transfer radiation method (DTRM) is used in the global radiation heat exchange. For the fire simulation, the different combustion models are evaluated for their performance and compared with the experimental data from the literature to verify. Thus, these numerical simulations can be adopted as a useful tool to design and optimize the smoke control strategy in cleanroom fire.

Assessment of Turbulent Combustion Models for Simulating Pre-Chamber Ignition in a Natural Gas Engine

2019 ◽  
Author(s):  
Joohan Kim ◽  
Riccardo Scarcelli ◽  
Sibendu Som ◽  
Ashish Shah ◽  
Munidhar S. Biruduganti ◽  
...  
Keyword(s):  
Natural Gas ◽  
Turbulent Combustion ◽  
High Efficiency ◽  
Turbulent Flame ◽  
Spark Ignition ◽  
Cylinder Wall ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Combustion Models ◽  
Combustion Processes

Abstract Lean combustion in an internal combustion engine is a promising strategy to increase thermal efficiency by leveraging a more favorable specific heat ratio of the fresh mixture and simultaneously suppressing the heat losses to the cylinder wall. However, unstable ignition events and slow flame propagation at fuel-lean condition lead to high cycle-to-cycle variability and hence limit the high-efficiency engine operating range. Pre-chamber ignition is considered an effective concept to extend the lean operating limit, by providing spatially distributed ignition with multiple turbulent flame-jets and enabling faster combustion rate compared to the conventional spark ignition approach. From a numerical modeling perspective, to date, still the science base and available simulation tools are inadequate for understanding and predicting the combustion processes in pre-chamber ignited engines. In this paper, conceptually different RANS combustion models widely adopted in the engine modeling community were used to simulate the ignition and combustion processes in a medium-duty natural gas engine with a pre-chamber spark-ignition system. A flamelet-based turbulent combustion model, i.e., G-equation, and a multi-zone well-stirred reactor model were employed for the multi-dimensional study. Simulation results were compared with experimental data in terms of in-cylinder pressure and heat release rate. Finally, the analysis of the performance of the two models is carried out to highlight the strengths and limitations of the two formulations respectively.

010 Numerical Study on Combustion Processes of Radiactive Waste in an Incinerator

2015 ◽  
Vol 2015.28 (0) ◽  
pp. _010-1_-_010-2_
Author(s):  
Shinichiro Yanase ◽  
Noritake Sugitsue ◽  
Yuu Ishimori ◽  
Kaoru Yokoyama ◽  
Yoshiyuki Ohara ◽  
...  
Keyword(s):  
Numerical Study ◽  
Combustion Processes

A numerical study of highly-diluted, burner-stabilised dimethyl ether flames

2015 ◽  
Vol 19 (2) ◽  
pp. 238-259 ◽  
Author(s):  
Daniel Mayer ◽  
Kai Moshammer ◽  
Liming Cai ◽  
Heinz Pitsch ◽  
Katharina Kohse-Höinghaus
Keyword(s):  
Dimethyl Ether ◽  
Numerical Study
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