A numerical study of the combustion and jet characteristics of a hydrogen fueled turbulent hot-jet ignition (THJI) chamber

Wang, Nana; Liu, Jinxiang; Chang, Wayne; Lee, Chia Fon

doi:10.1016/j.ijhydene.2018.09.156

Cited by 39 publications

(3 citation statements)

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“…Numerical simulations of TJI have been limited in RANS (Xu et al 2017(Xu et al , 2018Chinnathambi et al 2015;Gentz et al 2015b;Thelen et al 2015;Thelen and Toulson 2017;Wang et al 2018), Large Eddy Simulations (LES) (Validi et al 2017;Feyz et al 2019a;Malé et al 2019) and more recently Direct Numerical Simulations (DNS) (Validi and Jaberi 2018;Qin et al 2018;Benekos et al 2020). Although some preliminary lower-order modelling efforts were focused on capturing the mass entrainment rate and temporal evolution of the temperature profile in suddenly started jets (Feyz et al 2019b(Feyz et al , 2018, with the scope of extending the model to ignition delay prediction, a formally derived and validated low-order ignition model for TJI is missing from the existing literature.…”

Section: Introductionmentioning

confidence: 99%

A Novel One- and Zero-Dimensional Model for Turbulent Jet Ignition

Bardis

Kyrtatos²,

Barro

et al. 2021

Flow Turbulence Combust

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Turbulent jet ignition (TJI) is a promising combustion technology for burning highly diluted air-fuel mixtures. Computationally efficient models to assess the effect of the operating conditions and design parameters on the ignition propensity and timing are of paramount importance for the development of combustion systems employing TJI. To this end, a one-dimensional (1-D) jet model, which is based on the solution of the section integrated mass and momentum conservation equations, is derived in the present study. The model is extended with two additional transport equations for the turbulence intensity and the ignition precursor/tracer, that marks the ignition event. One-dimensional transient flamelet calculations are performed to generate tables for the ignition precursor source term that account for the turbulence and chemistry interaction. Further simplification of the model is carried out to obtain a novel penetration correlation and a computationally inexpensive Lagrangian ignition model. The extended jet model is hierarchically validated using available literature data for non-reactive and reactive jets, as well as experiments conducted in a state-of-the-art optically accessible prechamber. The derived model is able to reproduce both flow-related quantities (velocity and turbulence profiles, jet penetration) and the ignition delay time under different variations. This study also illustrates how numerical simulations in canonical configurations (one-dimensional flamelet) can be used in practical applications of TJI.

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Section: Introductionmentioning

confidence: 99%

A Novel One- and Zero-Dimensional Model for Turbulent Jet Ignition

Bardis

Kyrtatos²,

Barro

et al. 2021

Flow Turbulence Combust

View full text Add to dashboard Cite

show abstract

“…Numerical simulations of TJI included 3-D Reynolds Averaged Navier Stokes (RANS) simulations, 21–28 Large Eddy Simulations (LES), 29–31 and more recently Direct Numerical Simulations (DNS). 32–34 Zero/quasi-dimensional models have also been developed for prechamber gas engines and vary to the degree that the relevant physics are included.…”

Section: Introductionmentioning

confidence: 99%

Development and validation of a novel quasi-dimensional combustion model for un-scavenged prechamber gas engines with numerical simulations and engine experiments

Bardis

Kyrtatos²,

et al. 2020

International Journal of Engine Research

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Lean-burn gas engines equipped with an un-scavenged prechamber have proven to reduce nitrogen oxides (NOx) emissions and fuel consumption, while mitigating combustion cycle-to-cycle fluctuations and unburned hydrocarbon (UHC) emissions. However, the performance of a prechamber gas engine is largely dependent on the prechamber design, which has to be optimised for the particular main chamber geometry and the foreseen engine operating conditions. Optimisation of such complex engine components relies partly on computationally efficient simulation tools, such as quasi and zero-dimensional models, since extensive experimental investigations can be costly and time-consuming. This article presents a newly developed quasi-dimensional (Q-D) combustion model for un-scavenged prechamber gas engines, which is motivated by the need for reliable low order models to optimise the principle design parameters of the prechamber. Our fundamental aim is to enhance the predictability and robustness of the proposed model with the inclusion of the following: (i) Formal derivation of the combustion and flow submodels via reduction of the corresponding three-dimensional models. (ii) Individual validation of the various submodels. (iii) Combined use of numerical simulations and experiments for the model validation. The resulting model shows very good agreement with the numerical simulations and the experiments from two different engines with various prechamber geometries using a set of fixed calibration parameters.

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“…1 projects, the presence of internal combustion engines on the world market by 2050 will be predominant over other propulsion systems [8], while the total number of vehicles estimated for the year 2035 is 1.7 billion [9]. Thus, several technologies have been applied to produce ever more efficient engines, such as fuel direct injection [10][11][12], continuously variable valve timing [13,14], turbulent jet ignition [15], low-temperature dual-fuel combustion [16], unconventional cycles and downsizing strategies combined with the use of biofuels [17][18][19]. In this way, it is possible to produce compact turbocharged engines that have a compatible performance with much larger units and yet produce lower pollutant emissions, consuming less fuel [20].…”

Section: Introductionmentioning

confidence: 99%

The misleading total replacement of internal combustion engines by electric motors and a study of the Brazilian ethanol importance for the sustainable future of mobility: a review

Malaquias

Netto

Filho

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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The sustainable future of mobility should not be viewed as the burial of the internal combustion engine (ICE), nowadays the main source of vehicular propulsion. Even with the increasing electrification of the transport means, the low global percentage of the electric fleet, around 0.2% of the total road vehicles, associated with an annual growth rate of less than 60%, indicates that they will not significantly change the market share in the short-and medium-term periods. This means that fuel demanded by ICEs and pollutant emissions generated by them will be very relevant in the years to come. Thus, the search for significant advances in technology associated with the use of renewable fuels is very important for environmental and economic sustainability. In this regard, the present work intends to demonstrate that the association between Brazilian ethanol and advanced technology in ICEs is a promising alternative for a more sustainable global mobility in the future. For this purpose, some ethanol properties are presented to justify its relevance as an ideal biofuel for highly boosted and efficient engines. Then, environmental, social, ethical and economic impacts arising from electric vehicles are investigated, demystifying the zero-emission vehicle terminology attributed to them and, finally, new technologies for ICEs are presented, proving that they are constantly evolving and improving, which is fundamental to the future of the world automotive fleet.

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A numerical study of the combustion and jet characteristics of a hydrogen fueled turbulent hot-jet ignition (THJI) chamber

Cited by 39 publications

References 50 publications

A Novel One- and Zero-Dimensional Model for Turbulent Jet Ignition

A Novel One- and Zero-Dimensional Model for Turbulent Jet Ignition

Development and validation of a novel quasi-dimensional combustion model for un-scavenged prechamber gas engines with numerical simulations and engine experiments

The misleading total replacement of internal combustion engines by electric motors and a study of the Brazilian ethanol importance for the sustainable future of mobility: a review

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