Analysis of the potential of a new automotive two-stroke gasoline engine able to operate in spark ignition and controlled autoignition combustion modes

López, J. Javier; Molina, Santiago; García, Antonio; Valero-Marco, Jorge; Justet, Frederic

doi:10.1016/j.applthermaleng.2017.07.213

Cited by 13 publications

(8 citation statements)

References 20 publications

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“…The operation in one or the other mode mainly depends on the mixture reactivity, which will allow or not the autoginition of the mixture. 25 In fact, this parameter is strongly affected by the engine load, and consequently the different combustion modes are operated as a function of the engine load, as illustrated qualitatively in Figure 2:…”

Section: Experimental Facilities and Methodologymentioning

confidence: 99%

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Characterization of the turbulent flame front surface in spark ignition engines during spark ignition operation to identify controlled auto-ignition and abnormal combustion

Macián

López

Martín

et al. 2020

International Journal of Engine Research

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The combustion diagnostics and subsequent analysis are standardized tools based on the estimation of the heat release law (HRL). From this estimation, the different combustion parameters can be obtained: combustion phasing and duration, heat release rate, and so on. This analysis might be usually enough to study traditional spark ignition (SI) engines. However, with the new upcoming SI engines, this is probably not the case anymore, since different combustion modes can be operated in the same engine, as for instance a combination of SI and controlled auto-ignition (CAI) combustion modes. When different combustion modes are combined, it seems interesting to study in more depth the HRL, trying to get more data and to study the differences among the diverse combustion modes. Toward this end, a methodology to go deeper in the study of the HRL is proposed in this work, consisting of, mainly quantifying and taking into account the most relevant influencing parameters: the fuel properties (mainly its lower heating value), the in-cylinder oxygen content, the density of the burned and unburned zones, the laminar combustion speed, and the turbulence effect. With the proposed methodology, a standard SI combustion, developed by a flame front, can be characterized at any given operating point. This would allow to predict which the combustion developement would be, at this operating point, assuming it to be developed by a flame front. Subsequently, this SI combustion prediction can be compared to the one obtained experimentally, making it possible to identify and analyze abnormal combustion phenomena, as well as to study the differences between a combustion developed by a flame front (SI) and by auto-ignition (CAI). Derived from this work, an alternative equation to experimentally characterize the laminar combustion velocity has also been proposed, in order to improve its applicability in a wider range of fuel/air ratios and dilution degrees.

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Section: Experimental Facilities and Methodologymentioning

confidence: 99%

“…This engine was developed in the context of the ULCGE (Ultra Low Cost Gasoline Engine) project, carried out by Renault. More details about the project and the engine are available at López et al 25…”

Section: Experimental Facilities and Methodologymentioning

confidence: 99%

Characterization of the turbulent flame front surface in spark ignition engines during spark ignition operation to identify controlled auto-ignition and abnormal combustion

Macián

López

Martín

et al. 2020

International Journal of Engine Research

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“…Since the latter may add some high-frequency disturbances in the pressure signal due to resonances within the gap between the adapter and the mounting bore, a custom glow plug adapter with reduced gap length (at the cost of reduced life of the sensor) was designed, ensuring that natural frequencies of the cavity were beyond 35 kHz and thus that acoustic measurements such as those reported in this work (< 20 kHz) could be performed free of disturbances. Additional details of the experimental facilities can be found in previous investigations [37,38]. In Fig.…”

Section: Methodsmentioning

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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“…Consequently, it can be observed that product development period has been reduced to less than two years in almost all cars manufactories [3][4][5][6]. We can also realize the severity of specifications required by the international standards in order to protect environment (like euro standards) [7][8].…”

Section: Introductionmentioning

confidence: 96%

Impact of underhood leakage zones on the aerothermal situation – Experimental simulations and physical analysis

Khaled

Faraj

Harika

et al. 2018

Applied Thermal Engineering

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The present manuscript deals with experimental investigations on thermal effects of air leakage zones at the boundaries of the vehicle hood. Measurements are carried out on a Peugeot 207 (Front Wheel Drive) in wind tunnel. The front wheels are activated by the car's engine and rolling on controlling rollers built in the wind tunnel. In parallel, the wind velocity is well controlled in order to simulate real conditions of driving. The underhood compartment is equipped with 80 thermocouples distributed on different components. Three operating conditions are studied according to the engine's rpm, to the wind and wheels velocities. The leakage zones are purposely clogged with five different configurations. The effect of the leakage zones has shown significant impact on the temperature field and has been physically analyzed.

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Analysis of the potential of a new automotive two-stroke gasoline engine able to operate in spark ignition and controlled autoignition combustion modes

Cited by 13 publications

References 20 publications

Characterization of the turbulent flame front surface in spark ignition engines during spark ignition operation to identify controlled auto-ignition and abnormal combustion

Characterization of the turbulent flame front surface in spark ignition engines during spark ignition operation to identify controlled auto-ignition and abnormal combustion

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

Impact of underhood leakage zones on the aerothermal situation – Experimental simulations and physical analysis

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