Abstract
Reducing green-house gases emission from light-duty vehicles is compulsory in order to slow down the climate change. The application of High Frequency Ignition systems based on the Corona discharge effect has shown the potential to extend the dilution limit of engine operating conditions promoting lower temperatures and faster combustion events, thus, higher thermal and indicating efficiency. Furthermore, predicting the behavior of Corona ignition devices against new sustainable fuel blends, including renewable hydrogen and biogas, is crucial in order to deal with the short-intermediate term fleet electric transition. The numerical evaluation of Corona-induced discharge radius and radical species under those conditions can be helpful in order to capture local effects that could be reached only with complex and expensive optical investigations. Using an extended version of the Corona one-dimensional code previously published by the present authors, the simulation of pure methane and different methane–hydrogen blends, and biogas–hydrogen blends mixed with air was performed. Each mixture was simulated both for 10% recirculated exhaust gas dilution and for its corresponding dilute upper limit, which was estimated by means of chemical kinetics simulations integrated with a custom misfire detection criterion.
Highlights
Published: 15 February 2022Advances in the internal combustion engines design are necessary in order to effectively reduce the carbon dioxide tailpipe emissions while carbon-free technologies for light duty vehicles become mature
The current paper aims to extend the previous work by the same authors [21] on the characterization of radical species production from Corona discharge generated by a one-tip High Frequency Ignition (HFI) device under engine-like environmental conditions
In this work the joint use of a thermodynamics engine approach and detailed chemical kinetics-driven machine learning together with a custom Corona ignition model was presented in the framework of numerical simulation with the focus on generation engine, being the methodology applied to investigate the role of hydrogen, lean limits, and corona ignition systems in Spark Ignition (SI) engines
Summary
Published: 15 February 2022Advances in the internal combustion engines design are necessary in order to effectively reduce the carbon dioxide tailpipe emissions while carbon-free technologies for light duty vehicles become mature. With regard to Spark Ignition (SI) engines, two of the main limiting factors against the improvement of fuel economy are the pressure losses during throttled operations, and the very high cycle average temperature compared with that of Compression Ignition (CI) engines, which strongly affect the indicating and the thermal efficiency, respectively. One of the main concerns regarding highly diluted operations is the flame stability, together with the risk of incomplete combustion and ignition failure [3,4]. In order to run engine operations richer in EGR while ensuring combustion stability and repeatability, the use of supporting device is compulsory. In this framework, the equipment of the engine with High Frequency Ignition (HFI) spark devices based on the so-called Corona discharge
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