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Research engine experiments

The main objective of the work assigned to Istituto Motori in the project within WP2 (Advanced Experimental. Analysis of Auto Ignition) was the provision of comprehensive experimental data in order to improve understanding of how the changes of engine parameters and fuels affected knock phenomena. Non-intrusive diagnostic techniques based on broadband ultraviolet (UV) to visible spectroscopy were applied to optical accessible spark ignition engine. The optical spark ignition engine was realized by using a Ford Zetec SE Sigma 16V engine head and ported fuel injection (PFI) system.

The simultaneous use of broadband flame spectroscopy from UV to visible and 2D chemiluminescence. at selected wavelengths, permitted the evaluation of knocking locations and concentration of radical species involved in the process with high spatial resolution around 100 um and time resolution around 0.1° crank angle. Several engine operating conditions and fuels were investigated.

The knock location and radical species involved were not strongly influenced by engine operating conditions meanwhile the radicals concentration and their time evolution depended on fuel properties.

The measurements carried out confirmed the capability of the presented optical technique to characterise knock formation and evolution in experimental and real spark ignition engine under realistic engine conditions.

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