|Tipo di tesi||Tesi di laurea magistrale|
|Titolo||Analisi anti-g della lubrificazione nella trasmissione anteriore di un'auto sportiva|
|Titolo in inglese||Anti-g lubrication analysis in sport-car front-axle transmission|
|Struttura||Dipartimento di Ingegneria "Enzo Ferrari"|
|Corso di studi||Advanced Automotive Engineering (D.M.270/04)|
|Data inizio appello||2022-04-11|
|Disponibilità||Accesso limitato: si può decidere quali file della tesi rendere accessibili. Disponibilità mixed (scegli questa opzione se vuoi rendere inaccessibili tutti i file della tesi o parte di essi)|
|Data di rilascio||2062-04-11|
Questa tesi di laurea magistrale tratta il risultato dell'attività di tirocinio presso DISMI-UNIMORE, dipartimento di scienze e metodi dell'ingegneria. L'obiettivo di questo lavoro è l'indagine numerica attraverso l'analisi CFD di un flusso lubrificante multifase in una trasmissione relativa ad un assale anteriore utilizzata in veicoli ad alte prestazioni.
The purpose of this master’s thesis paper is the result of the internship activity performed at DISMI-UNIMORE, dipartimento di scienze e metodi dell’ingegneria. The objective of this work is the numerical investigation through CFD analysis of multiphase lubricating flow in a front axle transmission used in high performance vehicles. The analysis, having as its main objective the implementation, development and verification of a fully three-dimensional and multiphase CFD approach of the system under consideration, is conducted through a specific software for fluid dynamics simulations, called STAR-CCM+. The numerical model is used in order to predict the distribution of the oil present in the fluid domain of the axle when a force, due to the accelerations of the vehicle, is applied to the fluid. In order to have a truthful analysis, the geometry of the fluid domain has been slightly simplified to have a more stable and reliable analysis. The approach selected in order to model the multiphase flow that characterizes the component is the “multiphase MMP-LSI”. Once the physic of the problem has been set correctly, the challenge is the setting of the field functions and of all the parameters that are necessary in order to have a correct analysis of the phenomenon. Setting the level of oil in the front axle fluid domain, the flow rate of the main hydraulic systems present inside the transmission, the velocity of the fluid through the pump and imposing them to the fundamental boundary parameters, the mode is ready for the simulation. Once the simulation results has been get, the main focus of the post processing is the analysis of the flow rate values given by the reports and of the volume fraction of oil scenes created before. From the study of these results, the target is the attempt to understand which changes can be done in the front axle transmission geometry in order to improve the lubrication against the g-forces due to the accelerations. In particular, the challenge is try to delay as much as possible the air suction by the pump, in order toavoid problem of cavitation and of presence of air in the hydraulic circuit. Finally, in order to improve the model of the transmission, has been done also a geometrical analysis aimed at obtaining the minimum volume of oil needed to avoid air suction or the period of time that there is, before the reaching of it. All this study has been done taking advantage of the STAR-CCM+ CAD functions.