Development and Validation of a Quasi-Dimensional Dual Fuel (Diesel – Natural Gas) Combustion Model

Taritaš, Ivan; Kozarac, Darko; Sjerić, Momir; Aznar, Miguel Sierra; Vuilleumier, David; Tatschl, Rainhard

doi:10.4271/2017-01-0517

Cited by 15 publications

(6 citation statements)

References 28 publications

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“…Pilot-ignited dual fuel combustion usually involves combined processes of autoignition, diffusion flames, and flame propagation, which is challenging for experimental measurement and numerical modelling [10,11]. Various numerical models have been developed for dual fuel engine modelling, such as phenomenological approaches [12], quasi-two zone up to multi-zone models [13,14], and level-set G-equation approach coupled with Shell Ignition and Characteristic-Time-Combustion (CTC) models [15]. Recently, turbulent combustion models with detailed chemistry have been extended to dual-fuel combustion simulations.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of triple-flames in ignition of turbulent dual fuel mixture: A direct numerical simulation study

Jin

Luo

Wang

et al. 2019

Proceedings of the Combustion Institute

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Pilot-ignited dual fuel combustion involves a complex transition between the pilot fuel autoignition and the premixed-like phase of combustion, which is challenging for experimental measurement and numerical modelling, and not sufficiently explored. To further understand the fundamentals of the dual fuel ignition processes, the transient ignition and subsequent flame development in a turbulent dimethyl ether (DME)/methane-air mixing layer under diesel enginerelevant conditions are studied by direct numerical simulations (DNS). Results indicate that combustion is initiated by a two-stage autoignition that involves both low-temperature and hightemperature chemistry. The first stage autoignition is initiated at the stoichiometric mixture, and then the ignition front propagates against the mixture fraction gradient into rich mixtures and eventually forms a diffusively-supported cool flame. The second stage ignition kernels are spatially distributed around the most reactive mixture fraction with a low scalar dissipation rate. Multiple triple flames are established and propagate along the stoichiometric mixture, which is proven to play an essential role in the flame developing process. The edge flames gradually get close to each other with their branches eventually connected. It is the leading lean premixed branch that initiates the steady propagating methane-air flame. The time required for steady flame propagation is substantially shorter than the autoignition delay time of the methane-air mixture under the same thermochemical condition.Temporal evolution of the displacement speed at the flame front is also investigated to clarify the propagation characteristics of the combustion waves. Cool flame and propagation of triple flames are also identified in this study, which are novel features of the pilot-ignited dual fuel combustion.

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Section: Introductionmentioning

confidence: 99%

Dynamics of triple-flames in ignition of turbulent dual fuel mixture: A direct numerical simulation study

Jin

Luo

Wang

et al. 2019

Proceedings of the Combustion Institute

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“…Some of these fuels are less reactive than conventional diesel fuel and therefore, are more challenging to use on compression-ignition engines where auto-ignition of the fuel is needed. Dual-fuel systems are one way to leverage less reactive fuels on heavyduty engines [34][35][36][37][38]. One such fuel is natural gas and it will be focused on here as an example of the benefits and challenges of this type of engine operation.…”

Section: Conventional Dual-fuel Compression-ignition Enginesmentioning

confidence: 99%

Dual-Fuel Combustion

Kassa¹,

Hall²

2019

The Future of Internal Combustion Engines

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The implementation of a dual-fuel combustion strategy has recently been explored as a means to improve the thermal efficiencies of internal combustion engines while simultaneously reducing their emissions. Dual-fuel combustion is utilized in compression ignition (CI) engines to promote the use of more readily available gaseous fuels or more efficient, advanced combustion modes. Implementing dual-fuel injection technologies on these engines also allows (1) for improved control of the combustion timing by varying the proportion of two simultaneously injected fuels, and (2) for the use of more advanced combustion modes at high load since the two injected fuels ignite in succession reducing the high peak pressures that generally act as a limiting factor. In spark-ignited (SI) engines, the implementation of a dual-fuel combustion strategy serves as an alternative approach to avoid engine knock. The dual-fuel SI engine relies on the simultaneous injection of a low knock resistance and high knock resistance fuel to dynamically adjust the fuel mixture's resistance to knock as required. The dual-fuel SI engine thereby successfully suppresses knock without compromising the engine efficiency. This chapter discusses the technological advancements associated to dual-fuel combustion and the respective gains in fuel efficiency and emissions reductions that have been achieved.

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“…In Ref. [15], the ignition delay is calculated in each package using tabulated ignition delay times. Each ignited package is then burned within a reaction time, derived from reaction kinetics calculations.…”

Section: Introductionmentioning

confidence: 99%

“…The model is validated in Ref. [15] against measurement data of a 2-L 4-cylinder diesel engine, equipped with NG port fuel injection and operated in dual-fuel mode.…”

Section: Introductionmentioning

confidence: 99%

A New Combustion Model for Medium Speed Dual-Fuel Engines in the Course of 0D/1D Simulation

Frerichs

Eilts

2022

Methane

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In this paper, a predictive combustion model is developed and implemented in GT-Power. The model consists of a detailed physically/chemically based ignition delay model, including a 1D spray model. The spray model results at the start of combustion are used to initialize the combustion model. The spray zone and the homogenous natural gas/air mixture are burned with different combustion models, to account for the effect of the inhomogeneous fuel distribution. NOx-emissions are modelled using a standard Extended Zeldovich Mechanism, and for the HC-emissions, two flame quenching models are included and extended with an empirical correlation. The models are calibrated with measurement data from a single cylinder engine, except for the ignition delay model which needs no calibration. The start of combustion and the combustion parameters are predicted well for a wide range of injection timings and operation conditions. Furthermore, considering unburned fuel, the engine operation parameters BSFC and IMEP are also predicted satisfactory. Due to the detailed description of the different combustion phases, the influence of the injection timing on the NOx-emission is captured satisfactorily, with the standard NOx-model. Finally, the knock limited MFB50 is also predicted within an acceptable range.

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Development and Validation of a Quasi-Dimensional Dual Fuel (Diesel – Natural Gas) Combustion Model

Cited by 15 publications

References 28 publications

Dynamics of triple-flames in ignition of turbulent dual fuel mixture: A direct numerical simulation study

Dynamics of triple-flames in ignition of turbulent dual fuel mixture: A direct numerical simulation study

Dual-Fuel Combustion

A New Combustion Model for Medium Speed Dual-Fuel Engines in the Course of 0D/1D Simulation

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