|Tipo di tesi||Tesi di laurea magistrale|
|Titolo||Sviluppo di un modello virtuale CFD per il motore ibrido Formula Student 2019|
|Titolo in inglese|
|Struttura||Dipartimento di Ingegneria|
|Corso di studi||Ingegneria Del Veicolo (D.M.270/04)|
|Data inizio appello||2018-10-23|
|Disponibilità||Accessibile via web (tutti i file della tesi sono accessibili)|
Negli ultimi anni le norme antinquinamento sono diventate sempre più severe e molte case automobilistiche stanno passando da veicoli dotati del solo motore a combustione interna a veicoli ibridi o completamente elettrici. Il mondo del motorsport non è insensibile a questo cambiamento e anche la Formula Student ha dato la sua risposta, creando una competizione per monoposto ibride.
In recent years, antipollution rules have become progressively stricter and many automotive companies are moving from pure internal combustion engine vehicle to hybrid or even full electric ones. The world of motorsport is not insensible to this change and Formula Student has given its answer too, creating a competition for hybrid single-seaters. The University of Modena and Reggio Emilia has decided to develop its own racing car from scratch, in order to compete in Formula Student Hybrid in 2019. The internal combustion engine is still a strongpoint and the Ducati 959 Panigale’s one has been chosen as the base of the endothermic unit of the new vehicle. To keep the hybrid power unit under the maximum allowed displacement of 710 cc and compact, one piston has been removed and the electric motor has been installed in the empty space. The thesis work is focused on the endothermic part only and it consists in the creation of a 3D-CFD model (three-dimensional computational fluid dynamics model) starting from the geometry of the chosen engine. After that, the final aim is to simulate a full-load operating condition, using pressure and temperature boundary conditions from a calibrated 1D-CFD model. The software used for these studies are the commercial codes by Siemens STAR-CCM+, STAR-CD and its tool es-ice. The initial geometry has been repaired and organized in STAR-CCM+, then the moving mesh is created and boundary conditions applied, port fuel injection and combustion set through es-ice and STAR-CD. The chosen combustion model is G-Equation, a model capable of separating the burnt from the unburnt by an isosurface of scalar named G, generally the G=0 surface. Different simulations varying the start of ignition timing advance are carried out, in order to make the pressure trace of pression as similar as possible to the provided data. Then a multicycle simulation is executed to discard the effect of cyclic variance on the ensemble average result, accounting for mass through valves, air trapping efficiency, equivalence ratio and in-cylinder physical quantities. Once the converge in accomplished, combustion is studied more in detail with higher complexity models. Finally, the calibrated 3D-CFD model will be the basis for deeper investigation and future developments concerning different injection strategies and the variation of compression ratio.