Calibration strategy of diesel-fuel spray atomization models using a design of experiment method

Brulatout, Jonathan; Garnier, F.; Mounaïm‐Rousselle, Christine; Seers, Patrice

doi:10.1177/1468087415611030

Cited by 13 publications

(5 citation statements)

References 37 publications

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“…The TAB and RT breakup models cannot provide reasonable predictions for the characteristics of high-pressure sprays either. Brulatout et al [10] compared the simulation results of the highpressure diesel sprays with RD and KHRT models and demonstrated the important interaction between model parameters on the simulation results for both models.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Gasoline Spray with an Outward-Opening Piezoelectric Injector: A Comparative Study of Different Breakup Models

Wang¹,

Zhao²

2018

SAE Technical Paper Series

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The outward-opening piezoelectric injector can achieve stable fuel/air mixture distribution and multiple injections in a single cycle, having attracted great attentions in direct injection gasoline engines. In order to realise accurate predictions of the gasoline spray with the outwardopening piezoelectric injector, the computational fluid dynamic (CFD) simulations of the gasoline spray with different droplet breakup models were performed in the commercial CFD software STAR-CD and validated by the corresponding measurements. The injection pressure was fixed at 180 bar, while two different backpressures (1 and 10 bar) were used to evaluate the robustness of the breakup models. The effects of the mesh quality, simulation timestep, breakup model parameters were investigated to clarify the overall performance of different breakup model in modeling the gasoline sprays. It is found that the tuned Reitz-Diwakar (RD) model shows robust performance under different backpressures and the spray penetration shows good agreement with the experimental measurements. However, the modified Kelvin-Helmholtz (KH) Rayleigh-Taylor (RT) model could not achieve good agreements with fixed model parameters at different backpressures. The tuned KHRT model at 1 bar backpressure shows much faster breakup process at 10 bar backpressure, leading to abnormal spray patterns and fuel vapor distributions. As there is no further tuning requirement for different backpressures, the RD model is found to be better in modeling the gasoline sprays from the outward-opening piezoelectric injector.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Gasoline Spray with an Outward-Opening Piezoelectric Injector: A Comparative Study of Different Breakup Models

Wang¹,

Zhao²

2018

SAE Technical Paper Series

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“…Only the KH breakup time constant effect was investigated via the CKH empirical constant, which is therefore modified, while other constants were kept at the default values. Indeed, this constant significantly affects the penetration evolutions of the sprays as reported by Reitz [52] and Brulatout [53]. As a matter of fact, by increasing the CKH constant value, the primary breakup time is increased, allowing a deeper tip penetration, and consequently modifying the vapor distribution as well.…”

Section: Atomization Model Analysismentioning

confidence: 80%

Numerical Analysis of Dual Fuel Combustion in a Medium Speed Marine Engine Supplied with Methane/Hydrogen Blends

Cameretti,

De Robbio,

Palomba

2023

Energies

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Compression ignition engines will still be predominant in the naval sector: their high efficiency, high torque, and heavy weight perfectly suit the demands and architecture of ships. Nevertheless, recent emission legislations impose limitations to the pollutant emissions levels in this sector as well. In addition to post-treatment systems, it is necessary to reduce some pollutant species, and, therefore, the study of combustion strategies and new fuels can represent valid paths for limiting environmental harmful emissions such as CO2. The use of methane in dual fuel mode has already been implemented on existent vessels, but the progressive decarbonization will lead to the utilization of carbon-neutral or carbon-free fuels such as, in the last case, hydrogen. Thanks to its high reactivity nature, it can be helpful in the reduction of exhaust CH4. On the contrary, together with the high temperatures achieved by its oxidation, hydrogen could cause uncontrolled ignition of the premixed charge and high emissions of NOx. As a matter of fact, a source of ignition is still necessary to have better control on the whole combustion development. To this end, an optimal and specific injection strategy can help to overcome all the before-mentioned issues. In this study, three-dimensional numerical simulations have been performed with the ANSYS Forte® software (version 19.2) in an 8.8 L dual fuel engine cylinder supplied with methane, hydrogen, or hydrogen–methane blends with reference to experimental tests from the literature. A new kinetic mechanism has been used for the description of diesel fuel surrogate oxidation with a set of reactions specifically addressed for the low temperatures together with the GRIMECH 3.0 for CH4 and H2. This kinetics scheme allowed for the adequate reproduction of the ignition timing for the various mixtures used. Preliminary calculations with a one-dimensional commercial code were performed to retrieve the initial conditions of CFD calculations in the cylinder. The used approach demonstrated to be quite a reliable tool to predict the performance of a marine engine working under dual fuel mode with hydrogen-based blends at medium load. As a result, the system modelling shows that using hydrogen as fuel in the engine can achieve the same performance as diesel/natural gas, but when hydrogen totally replaces methane, CO2 is decreased up to 54% at the expense of the increase of about 76% of NOx emissions.

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“…Indeed, B 1 is given a variety of values as reported in Reitz and Beale, 38 Ricart et al, 40 Van Dam and Rutland, 71 and Brulatout. 72 The rather large B 1 range owes to the fact that the initial KH unstable waves rely heavily on the fuel properties, injector geometry, and near-nozzle air entrainment. The rather close α values indicate that the baseline conditions may share the same density ratio dependency of the breakup length.…”

Section: Resultsmentioning

confidence: 99%

Large-eddy spray simulation under direct-injection spark-ignition engine-like conditions with an integrated atomization/breakup model

Rutland

Pérez

et al. 2020

International Journal of Engine Research

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In this work, a hybrid breakup model tailored for direct-injection spark-ignition engine sprays is developed and implemented in the OpenFOAM CFD code. The model uses the Lagrangian–Eulerian approach whereby parcels of liquid fuel are injected into the computational domain. Atomization and breakup of the liquid parcels are described by two sub-models based on the breakup mechanisms reported in the literature. Evaluation of the model has been carried out by comparing large-eddy simulation results with experimental measurements under multiple direct-injection spark-ignition engine-like conditions. Spray characteristics including liquid and vapor penetration curves, droplet velocities, and Sauter mean diameter distributions are examined in detail. The model has been found to perform well for the spray conditions considered in this work. Results also show that after the end of injection, most of the residual droplets that are still in the breakup process are driven by the bag and bag–stamen breakup mechanisms. Finally, an effort to unify the breakup length parameter is made, and the given value is tested under various ambient density and temperature conditions. The predicted trends follow the measured data closely for the penetration rates, even though the model is not specifically tuned for individual cases.

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Calibration strategy of diesel-fuel spray atomization models using a design of experiment method

Cited by 13 publications

References 37 publications

Numerical Simulation of the Gasoline Spray with an Outward-Opening Piezoelectric Injector: A Comparative Study of Different Breakup Models

Numerical Simulation of the Gasoline Spray with an Outward-Opening Piezoelectric Injector: A Comparative Study of Different Breakup Models

Numerical Analysis of Dual Fuel Combustion in a Medium Speed Marine Engine Supplied with Methane/Hydrogen Blends

Large-eddy spray simulation under direct-injection spark-ignition engine-like conditions with an integrated atomization/breakup model

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