Quantitative analysis of automotive spray using the Particle Tracking Velocimetry (PTV) technique

• Grant number: 23/18108-4
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: March 01, 2024
• End date: February 28, 2025
• Field of knowledge: Engineering - Mechanical Engineering - Transport Phenomena
• Principal Investigator: Arthur Vieira da Silva Oliveira
• Grantee: Luigi Antônio Guimarães Martin
• Host Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
• Associated research grant: 21/01897-0 - Experimental study of droplets impact onto heated walls using combined optical techniques: single droplets, multiple droplets and sprays, AP.JP

Abstract

At the moment the application of sprays is already commonly carried out in the most diverse areas of the industry. In internal combustion engines, for example, it is common to use a fuel injection system using sprays, in order to increase the fluid atomization and avoid adhesion and contact with the walls of the combustion chamber. Another important application is based on surface cooling, such as that of fast neutron nuclear reactors and metallurgy products. In this sense, the development of general models for the behavior of sprays presents limitations, especially due to the fact that this phenomenon is controlled by global average parameters. This difficulty can be overcome with the study and modeling of spray characterization which, in the case of the present project proposal, focuses on the behavior of fluid injection through an automotive injector. In this sense, in the search for the formulation of hydrodynamic models, regardless of the application, the knowledge of the size distribution and velocity of the drops is extremely important. Therefore, this Scientific Initiation proposal proposes the characterization of an automotive spray aiming to study the physical parameters of the droplets produced, feeding future investigations by the group on the impact of drops on walls for modeling spray cooling. The water injection tests will be carried out after the construction of an experimental bench that allows the control of the pressure of the injected fluid and injector parameters, such as activation frequency and opening time. The objective is to create a robust database on some injection hydrodynamic characteristics, based on the variation of experiment parameters, such as pressure and injection time through the use of the Particle Tracking Velocimetry (PTV) technique. Furthermore, LaVision's Particle Master software will be used in order to process the data obtained, allowing the desired correlations to be obtained, such as, for example, the speed of the droplet depending on the position of the spray and the diameter of the droplet itself.