Davide Viscione

The doctoral research topic focuses on the study of low-temperature combustion "Gasoline Compression Ignition" through a combined experimental-numerical approach. The auto-ignition of the stratified mixture generated by multiple injections depends on the local conditions of the mixture. Consequently, numerous experimental campaigns have been carried out to address the spray dynamics under unconventional conditions. The research topics addressed during the doctorate are as follows:


- Free-Spray Dynamic Analysis: This involves the study of the breakup of gasoline-type fuel jets injected under unconventional pressure and injection duration conditions. The analysis is conducted using a combined experimental and numerical approach. Regarding the experimental analysis, a campaign was conducted using the Mie-Scattering technique in collaboration with CNR-STEMS of Naples. The aforementioned data served as a reference to be followed during three-dimensional fluid dynamic simulations, with the aim of calibrating the atomization and breakup models of the code.


- Spray Impact Analysis: Similar to the free-spray analysis, the purpose of this activity is to calibrate the wall impact models of a CFD code by comparing experimental data acquired using the Mie-Scattering technique.


- GCI Combustion Analysis: The goal is to generate, in a CFD environment, a heat release comparable to that obtained experimentally under different injection timing conditions (MFB50), engine speed, and load. The previous treatment of spray dynamics plays a fundamental role in reconstructing the pressure signal in the chamber. The validation of the combustion model aims to investigate the weaknesses and peculiarities of GCI combustion directly within the combustion chamber.


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