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Research in Optical Engines
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Research in Optical Engines

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Mechanical Engineering".

Deadline for manuscript submissions: closed (30 June 2020) | Viewed by 3622

Special Issue Editors

Dr. Simona Silvia Merola

E-Mail Website
Guest Editor
Istituto Motori, Consiglio Nazionale delle Ricerche, 80125 Napoli, Italy
Interests: optical diagnostics; optical engines; alternative fuels; spark ignition; advanced ignition systems
Dr. Adrian Irimescu

E-Mail Website
Guest Editor
Istituto Motori, Consiglio Nazionale delle Ricerche, 80125 Napoli, Italy
Interests: internal combustion engines; heat and mass transfer; alternative fuels; quasi-dimensional modeling
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue is dedicated to the use of optical engines.
Optically accessible units are powerful tools for research and development; they support thorough investigation of fuel injection and combustion processes in internal combustion engines. Optical techniques are one of the most effective means of providing comprehensive and detailed information on flow field, chemical species and temperature distribution in the intake ducts and inside the cylinder. This category of research tools thus represents fundamental devices for advanced understanding of specific phenomena and provides precious outputs necessary to develop optimized power units for the new generation of vehicles and energy production systems.

Authors are encouraged to show new findings obtained through optical methods combined with other numerical and experimental methodologies. All aspects of applications in optically accessible engines are welcome.
Potential topics include but are not limited to recent advances in the following areas:

  • Progress in optical engines:
  • Optical engine concepts;
  • Optically accessible design and development;
  • Optical techniques applied in research engines for:
  • In-cylinder flow diagnostic;
  • Fuel injection characterization;
  • Combustion process analysis;
  • Validation data for simulations.

Dr. Simona Silvia Merola
Dr. Adrian Irimescu
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

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Keywords

  • concept and design of optical engines
  • optical diagnostics
  • laser-based techniques
  • in-cylinder optical investigations
  • optical analysis of combustion processes

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Published Papers (1 paper)

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Research

22 pages, 44804 KiB  
Article
An Optical Method to Characterize Streamer Variability and Streamer-to-Flame Transition for Radio-Frequency Corona Discharges
by Valentino Cruccolini, Carlo N. Grimaldi, Gabriele Discepoli, Federico Ricci, Luca Petrucci and Stefano Papi
Appl. Sci. 2020, 10(7), 2275; https://doi.org/10.3390/app10072275 - 27 Mar 2020
Cited by 16 | Viewed by 3219
Abstract
In recent years, radio-frequency corona ignition gained increasing interest from the engine research community because of its capability to extend the engine stable operating range in terms of lean and EGR dilution. The corona discharge generates streamers coming from a star-shaped electrode, generally [...] Read more.
In recent years, radio-frequency corona ignition gained increasing interest from the engine research community because of its capability to extend the engine stable operating range in terms of lean and EGR dilution. The corona discharge generates streamers coming from a star-shaped electrode, generally consisting of four or five tips. The temporal and spatial variability of such streamers in length, orientation, and branching can be factors that affect the combustion onset and, therefore, engine cycle-to-cycle variability. Generally, the latter is reduced with respect to a conventional spark igniter at the same air–fuel ratio, but still present. In this work, analysis on the corona discharge and on the subsequent combustion onset was carried out in an optically accessible engine by means of the detection, via high-speed camera, of the natural luminosity of streamers and flames. A method to characterize spatial and temporal variability in motored conditions is firstly presented. A statistical analysis of the streamer behavior was performed, by separately analyzing the streamers generated by each tip of the star-shaped electrode. Finally, an original method aimed at determining the moment of the first flame appearance, caused by the combustion onset, is presented. The outcome of this work can be used to improve the knowledge on corona discharge, in particular on the stochastic behavior that characterizes the streamers. The presented optical analysis can also be adapted to other volumetric, single- or multi-point ignition systems. Full article
(This article belongs to the Special Issue Research in Optical Engines)
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