Impact of the injector design on the combustion noise of gasoline partially premixed combustion in a 2-stroke engine

Broatch, A.; Margot, Xandra; Novella, Ricardo; Gómez-Soriano, Josep

doi:10.1016/j.applthermaleng.2017.03.081

Cited by 22 publications

(24 citation statements)

References 47 publications

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“…It is around 0.8 dB for the baseline, whereas in a case of the optimized configuration, a 1.6 dB of difference is seen. As Broatch et al and Torregrosa et al emphasized in several previous studies [22,23,56], local thermodynamic conditions before ignition govern the combustion phenomena and its subsequent in-cylinder pressure field effects. Therefore, limiting the simulation to the closed cycle and initializing the simulation with the results of the previous gas exchange process using the baseline configuration, may affect the prediction of noise levels when the geometry is highly modified, since local thermodynamic conditions can change notably.…”

Section: Coherence Of the Resultsmentioning

confidence: 94%

“…For this reason, most of acoustics related studies till date have focused on performing basic and straightforward analyses which are based on qualitative comparisons of the acoustic field [57] or traditional acoustic metrics [58]. Only a few of them attempted to link the frequency content with the spatial energy distribution [23] or the time evolution [59], in an effort to understand the propagation and dissipation patterns.…”

Section: Acoustic Analysismentioning

confidence: 99%

“…In particular, the use of computational fluid dynamics (CFD) is nowadays widely established in the automotive industry. Moreover, recent studies have demonstrated that CFD is a useful tool to recreate, visualize and study the combustion noise source [22,23]. Despite the attractive benefits of this method, the simulation of an internal combustion engine is challenging due to complex geometry, spatially and temporally varying conditions and complicated combustion chemistry.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Numerical Methodology for Optimization of Compression-Ignited Engines Considering Combustion Noise Control

Broatch¹,

Novella²,

Gómez-Soriano³

et al. 2018

SAE Int. J. Engines

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Section: Coherence Of the Resultsmentioning

confidence: 94%

Section: Acoustic Analysismentioning

confidence: 99%

mentioning

confidence: 99%

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Numerical Methodology for Optimization of Compression-Ignited Engines Considering Combustion Noise Control

Broatch¹,

Novella²,

Gómez-Soriano³

et al. 2018

SAE Int. J. Engines

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“…For qualitative analysis many research works estimate the acoustic path between the source and free-field conditions by a transfer function. This simplification does not allow for an accurate prediction of the radiated noise level [37,47], but it is extremely useful for relative comparisons [48,49]. Besides, several combustion noise metrics are defined following this method.…”

Section: Overall Noise CCVmentioning

confidence: 99%

Experimental Analysis of Cyclical Dispersion in Compression-Ignited Versus Spark-Ignited Engines and Its Significance for Combustion Noise Numerical Modeling

Broatch

López

García-Tíscar

et al. 2018

Journal of Engineering for Gas Turbines and Power

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As noise pollution remains one of the biggest hurdles posed by thermal engines, increasing efforts are made to alleviate the generation of combustion noise from the early design stage of the chamber. Since the complexity of both modern chamber geometries and the combustion process itself precludes robust analytic solutions, and since the resonant, highly three-dimensional pressure field is difficult to be measured experimentally, focus is put on the numerical modeling of the process. However, in order to optimize the resources devoted to this simulation, an informed decision must be made on which formulations are followed. In this work, the experimental cyclic dispersion of the in-cylinder pressure is analyzed in two typical compression-ignited (CI) and spark-ignited (SI) engines. Acoustic signatures and pressure rise rates (PRRs) are derived from these data, showing how while the preponderance of flame front propagation and dependency of previous cycle in SI engine noise usually calls for multicycle, more complex turbulence modeling such as large Eddy simulation (LES), simpler unsteady Reynolds-averaged Navier-Stokes (URANS) formulations can accurately characterize the more consistent pressure spectra of CI thermal engines, which feature sudden autoignition as the main noise source.

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“…In this figure, the combustion tracking is done by clipping the temperature field at 2000 K and colouring it by the fuel energy release, thus showing the location of the reaction zones. Besides, pressure profiles registered at the transducer position are included to distinguish at which cycle step is located each snapshot while allowing to relate the combustion with its corresponding pressure effects [51,52].…”

Section: Knocking Combustion Visualizationmentioning

confidence: 99%

Computational Methodology for Knocking Combustion Analysis in Compression-Ignited Advanced Concepts

2018

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In the present work, a numerical methodology based on three-dimensional (3D) computational fluid dynamics (CFD) was developed to predict knock in a 2-Stroke engine operating with gasoline Partially Premixed Combustion (PPC) concept. Single-cycle Unsteady Reynolds-Averaged Navier Stokes (URANS) simulations using the renormalization group (RNG) k − ε model were performed in parallel while the initial conditions are accordingly perturbed in order to imitate the variability in the in-cylinder conditions due to engine operation. Results showed a good agreement between experiment and CFD simulation with respect to cycle-averaged and deviation of the ignition timing, combustion phasing, peak pressure magnitude and location. Moreover, the numerical method was also demonstrated to be capable of predicting knock features, such as maximum pressure rise rate and knock intensity, with good accuracy. Finally, the CFD solution allowed to give more insight about in-cylinder processes that lead to the knocking combustion and its subsequent effects.In particular, PPC operated with low reacting fuels, such as gasoline, have shown encouraging results to achieve very low pollutant emissions while maintaining, or even improving, the thermal efficiency [10][11][12]. Indeed, this combustion concept operated in an innovative 2-Stroke high speed direct injection (HSDI) compression-ignited (CI) engine [13] offers a good flexibility to control the combustion timing and to extent the load range [14][15][16].This concept operates between completely premixed and fully diffusive conditions, whereby low pollutant emissions may be attained. However, to achieve these conditions while retaining an accurate combustion timing control with the injection event remains as the main drawback of this particular system when operating under transient conditions.Despite the attractive benefits of this engine system, its complexity due to the large number of parameters to be managed requires the use of optimization techniques which ensure greater flexibility, speed and lower costs than purely experimental procedures.In this framework, the use of computational fluid dynamics (CFD) simulations is nowadays widely established in both the research community and the automotive industry. Here, aspects such as the simulation of turbulence and how it couples with the chemistry [17] are still the main limiting factors for reproducing the reacting flow field accurately. Since the requirements in both fields tend to differ, specially in terms of time available, the approaches used are also usually different. While in the industry sector, simulations are based on Unsteady Reynolds-averaged Navier-Stokes (URANS) turbulence modelling [18,19] and flamelet-based combustion models [20] owing its lower computational demands, the research community prefer to resort to high-fidelity combustion models and more complex turbulence schemes such as Large Eddy Simulations (LES) [21] or Direct Numerical Simulations (DNS) [22].Although the industry standard tends to simplify the simulatio...

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Impact of the injector design on the combustion noise of gasoline partially premixed combustion in a 2-stroke engine

Cited by 22 publications

References 47 publications

Numerical Methodology for Optimization of Compression-Ignited Engines Considering Combustion Noise Control

Numerical Methodology for Optimization of Compression-Ignited Engines Considering Combustion Noise Control

Experimental Analysis of Cyclical Dispersion in Compression-Ignited Versus Spark-Ignited Engines and Its Significance for Combustion Noise Numerical Modeling

Computational Methodology for Knocking Combustion Analysis in Compression-Ignited Advanced Concepts

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