Numerical Simulations of a Prechamber Autoignition Engine Operating on Natural Gas

Heyne, Stefan; Millot, Grégory; Favrat, Daniel

doi:10.5541/ijot.166

Cited by 8 publications

(3 citation statements)

References 12 publications

(19 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several prechamber-specific CFD cases have been reported in the past, primarily with the KIVA and FLUENT software packages. Of these cases it has been typical practice to use greatly reduced single-digit equation reaction mechanisms while , if modelled, has been modelled with a form of the Zeldovich mechanism [43][44][45][46][47][48]. More elaborate models using a dedicated multi-step ignition model or a larger mechanism have been used but considering current capabilities, the treatment of chemistry in prechamber-specific cases can be improved [49][50].…”

Section: Previous Prechamber Cfd Modellingmentioning

confidence: 99%

Numerical simulation of liquid fuel prechamber ignition

Larson¹

2021

Preprint

View full text Add to dashboard Cite

A Computational Fluid Dynamics (CFD) model was built that simulates the transient, compressible, reacting, multi-phase environment that exists within a reciprocating engine's combustion chamber(s). ANSYS Fluent v13.0 was used with the Euler-Lagrangian Discrete Phase Model (DPM), the Shell autoignition model, and the Large Eddy Simulation (LES) method of turbulence modeling. Validation of the spray dynamics was performed by comparing simulation results with experiments of liquid and vapour penetration length of an n-Heptane spray experiment done by Sandia National Laboratories. It was found that LES produced more accurate results than several Reynolds Averaged Navier-Stokes (RANS) models. The Shell autoignition model was coded to function with C10.17H19.91 and compared with experimental ignition results in a Rapid Compression Machine (RCM) environment. All of the above models were then combined to simulate a directly-fueled lean-burn combustion prechamber configuration wherein the effects of spray angle, timing, and duration were studied.

show abstract

Section: Previous Prechamber Cfd Modellingmentioning

confidence: 99%

Numerical simulation of liquid fuel prechamber ignition

Larson¹

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…23 Despite that, the understanding of pre-chamber combustion and the role of the jet (thermal, chemical, and turbulence generation) remains incomplete. 18,24 A large pre-chamber volume contains a larger trapped mass, 25–27 thus enhancing the pre-chamber pressure build-up. The nozzle exit area (diameter and number of nozzles) 28 influences the pre-chamber pressure build-up, jets’ temperature, composition, turbulence, efficiency, and pollutant formations 2,21,25,28 ; Shah et al 25 found that large pre-chamber volume combined with small nozzle diameter yield shorter combustion duration with enhanced engine efficiency.…”

Section: Introductionmentioning

confidence: 99%

DoE-ML guided optimization of an active pre-chamber geometry using CFD

Silva

Mohan

Badra

et al. 2022

International Journal of Engine Research

View full text Add to dashboard Cite

An optimized active pre-chamber geometry was obtained by combining computational fluid dynamics (CFD) and machine learning (ML). A heavy-duty engine operating with methane under lean conditions was considered. The combustion process was modeled with a multi-zone well-stirred reactor (MZ-WSR) with a skeletal methane oxidation mechanism. The simulations were run for a complete cycle. For the optimization study, the pre-chamber was parametrized; six independent and three dependent variables were considered, while the volume was kept constant. Three hundred pre-chamber designs were generated, and a one-shot design of experiments (DoE) optimization was first considered. A merit function was adopted to rank the designs, and an optimum design was found from the DoE results, which yielded considerable improvements in merit ranking, considering fuel consumption, engine-out emissions, noise, and safety; secondly, machine learning algorithms were trained by utilizing the DoE results aiming at finding a globally optimum geometry for the considered operating condition. Five sequential iterations were performed, and the ML algorithms were capable of proposing a new design with superior performance compared to the best DoE.

show abstract

“…When compared to the number of experimental tests already carried out, the amount of numerical studies involving prechambers is relatively small. One of them was developed by Heyne, Millot and Favrat [4], who simulated a prechamber autoignition gas engine using the commercial code Fluent. Jamrozik, Tutak, Kociszewski and Sosnowski [5] also presented their results for a numerical simulation of two-stage combustion in SI engine with prechamber, using KIVA-3V code.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of a Torch-Ignition System for an Internal Combustion Engine

Radicchi¹,

Braga²,

Coelho³

et al. 2015

AMM

View full text Add to dashboard Cite

Torch ignition systems in spark-ignition engines represents an interesting option in the efforts to reduce pollutants emission and specific fuel consumption. Based on this idea, this paper presents a 3D model of a prechamber created for a spark-ignition engine and focuses on the numerical analysis of the fluid flow inside the modified chamber. This kind of analysis is very important once it allowed evaluating aspects like turbulence parameters, pressure inside the chamber and prechamber, fluid recirculation and a possible prechamber’s geometry for the engine. The studies were done in a four valve Single Cylinder Research Engine – SCRE. For the numerical modeling and fluid flow investigation was used STAR-CD software. Results show higher values of tumble ratio and kinetic energy with the prechamber.

show abstract

Numerical Simulations of a Prechamber Autoignition Engine Operating on Natural Gas

Cited by 8 publications

References 12 publications

Numerical simulation of liquid fuel prechamber ignition

Numerical simulation of liquid fuel prechamber ignition

DoE-ML guided optimization of an active pre-chamber geometry using CFD

Numerical Analysis of a Torch-Ignition System for an Internal Combustion Engine

Contact Info

Product

Resources

About