Numerical study of fuel and turbulence distributions in an automotive-sized scavenged pre-chamber
More details
Hide details
ETH Zurich, Switzerland.
Ricardo, UK.
Publication date: 2019-02-01
Combustion Engines 2019,176(1), 61-67
This article presents a numerical study of the fuel and turbulence distributions in a pre-chamber at spark-time. The study has been conducted in the framework of the H2020 Gas-On project, dealing with the development of a lean-burn concept for an automotive-sized gas engine equipped with a scavenged pre-chamber. The test case considered studies a 7-hole pre-chamber with circumferentially-tilted orifices mounted on the cylinder head of a rapid compression-expansion machine (RCEM), consistent with the experimental test rig installed at ETH Zurich. An accurate description of turbulence and fuel distributions are key quantities determining the early flame development within the pre-chamber. Both quantities have an influence on the overall combustion characteristics and therefore on the engine performance. For this purpose, computational fluid dynamics (CFD) is employed to complement experimental investigations in terms of data completeness. The performance of the Reynolds-averaged Navier-Stokes (RANS)-based turbulence model is compared with large-eddy simulation (LES) through ensemble averaging of multiple LES realizations, in which the fuel injection rate evolution into the pre-chamber has been perturbed. Overall, RANS results show that the distributions of the turbulent kinetic energy and fuel concentration at spark-time agree well with the LES ensemble-averaged counterparts. This constitutes a prerequisite in view of the combustion phase and the accuracy reported provides further confidence in this regard.
ALLISON, P. et al. Pre-chamber ignition mechanism: experiments and simulations on turbulent jet flame structure. Fuel. 2018, 230, 274-281.
BISWAS, S., QIAO, L. A numerical investigation of ignition of ultra-lean premixed H2/air mixtures by pre-chamber supersonic hot jet. SAE International Journal of Engines. 2017. 2017-01-9284, 2231-2247.
BOLLA, M. et al. Numerical simulations of pre-chamber combustion in an optically accessible RCEM. SAE Technical Paper 2019-01-0224. 2019.
BOLLA, M. et al. Numerical study of turbulence and fuelair mixing within a scavenged pre-chamber using RANS and LES. SAE Technical Paper 2019-01-0198, 2019.
CHINNATHAMBI, P., BUNCE, M., CRUFF, L. RANS based multidimensional modeling of an ultra-lean burn prechamber combustion system with auxiliary liquid gasoline injection. SAE Technical Paper 2015-01-0386. 2015.
DALE, J.D., CHECKEL, M.D., SMY, P.R. Application of high energy ignition systems to engines. Progress in Energy and Combustion Science. 1997, 23(5-6), 379-398.
GHOLAMISHEERI, M., GIVLER, S., TOULSON, E. Large eddy simulation of a homogeneously charged turbulent jet ignition system. International Journal of Engine Research. 2017, 1468087417742834.
GHOLAMISHEERI, M., WICHMAN, I.S., TOULSON, E. A study of the turbulent jet flow field in a methane fueled turbulent jet ignition (TJI) system. Combustion and Flame. 2017, 183, 194-206.
HERNÁNDEZ, I., et. al., Flame-wall interaction modelling for pre-chamber combustion in lean burn gas engines, Proceedings of 34th International CAE Conference and Exhibition. 2018, Vicenza, Italy.
KOTZAGIANNI, M. et al. Experimental and computational investigations of prechamber jet ignition in a rapid compression expansion machine. Tenth Mediterranean Combustion Symposium. 2017.
LUCAS, G., TALLU, G., WEIßNER, M., CFD-based development of an ignition chamber for a lean and highly efficient CNG combustion, Proc. THIESEL 2018 Conference on Thermo- and Fluid Dynamic Processes in Direct Injection Engines. 2018.
PRZULJ, V. et al. The time scale bounded k-ε turbulence model and its assessment for automotive applications. In ICHMT digital library online. Begel House Inc. 2012.
SHAPIRO, E. et al. Advanced ignition modelling for prechamber combustion in lean burn gas engines. Proc. 4th International Conference on Ignition Systems for Gasoline Engines. 2018, Berlin.
SHAPIRO, E. et al. Experimental and numerical analysis of pre-chamber combustion systems for lean burn gas engines. SAE Technical Paper 2019-01-0260. 2019.
TALLU, G. et al. 3D CFD modelling and simulation of spark ignition inclusive of turbulence effects and detailed chemical kinetics. Proc. 3rd International Conference on Ignition Systems for Gasoline Engines. 2016, Berlin.
THELEN, B.C., TOULSON E. A computational study of the effects of spark location on the performance of a turbulent jet ignition system. SAE Technical Paper. 2016.
TOULSON, E., SCHOCK, H.J., ATTARD, W.P. A review of pre-chamber initiated jet ignition combustion systems. 2010, SAE International.
VALIDI, A., SCHOCK, H., JABERI, F. Turbulent jet ignition assisted combustion in a rapid compression machine. Combustion and Flame. 2017, 186, 65-82.
VAVRA, J. et al. Development of a pre-chamber ignition system for light duty truck engine. SAE Technical Paper. 2018.
VECTIS CFD Release 2017.1 Theory Manual. December 2017.
WANG, M. et al. A numerical study on the effects of the orifice geometry between pre-and main chamber for a natural gas engine. SAE Technical Paper. 2017.
WANG, N. et al. The effect of in-cylinder temperature on the ignition initiation location of a pre-chamber generated hot turbulent jet. SAE Technical Paper. 2018.
XU, G. et al. Characterization of combustion in a gas engine ignited using a small un-scavenged pre-chamber. International Journal of Engine Research. 2018, p. 1468087418798918.
YOSHIZAWA, A. Statistical theory for compressible turbulent shear flows, with the application to subgrid modeling. The Physics of Fluids. 1986, 29(7), 2152-2164.
Efficiency and raw emission benefits from hydrogen addition to methane in a Prechamber–Equipped engine
Patrik Soltic, Thomas Hilfiker
International Journal of Hydrogen Energy
Effect of spark ignition location on the turbulent jet ignition characteristics in a lean burning natural gas engine
Xue Yang, Yong Cheng, Qingwu Zhao, Pengcheng Wang, Jinbing Chen
International Journal of Engine Research
Efficient light-duty engine using turbulent jet ignition of lean methane mixtures
Patrik Soltic, Thomas Hilfiker, Severin Hänggi
International Journal of Engine Research
Numerical Analysis of Mixing of Bio-Hybrid Fuels in a Direct Injection Engine with a Pre-Chamber Ignition System
Tim Wegmann, Matthias Meinke, Maximilian Fleischmann, Stefan Pischinger, Wolfgang Schröder
SAE Technical Paper Series
Journals System - logo
Scroll to top