Eventos Anais de eventos
ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
OPTIMIZATION OF PIV PROCESSING IN THE INVESTIGATION OF AN ISOTHERMAL ETHANOL SPRAY CHAMBER
Submission Author:
Rafael Hauckewitz Todaro , SP
Co-Authors:
Rafael Hauckewitz Todaro, Antonio Pacifico, Rodrigo de Lima Amaral, Rafael da Cruz Ribeiro Berti, GUENTHER Krieger Filho
Presenter: Rafael Hauckewitz Todaro
doi://10.26678/ABCM.ENCIT2020.CIT20-0245
Abstract
Due to the need to produce more sustainable internal combustion engines with higher energy conversion efficiencies, lower fuel consumption and low levels of pollutants emissions, ethanol is a good alternative for engines equipped with direct injection system. In the process of formation of the ethanol spray the dynamics of air-spray interaction is fundamental for establishing more robust and realistic models. One way to investigate the development of this two-phase flow is by applying the Particle Image Velocimetry (PIV) technique. This work suggests some good practices in order to improve the PIV processing so that the flow investigation generates more reliable results. Such proposals aim to identify and treat the dominant noisy sources of PIV images in the investigation of the gas phase flow in an isothermal ethanol spray chamber (IESC). The sprays were formed by a typical injector of internal combustion engines equipped with direct injection system. Specifically, improvements were done in the steps of preprocessing, processing and post processing. The signal to noise ratio and spatial coherence of the fields were used as quality indicators in the optimization. In addition to the presence of the spray in the field of view, high velocity gradients associated with low tracer concentration are the limiting factors in the representation of gas phase flow. In this case, the large size and high overlap of the interrogation window are suggested to obtain adequate results without losing spatial resolution in air-spray interaction.
Keywords
PIV Optimization, air-spray interaction, ethanol
DOWNLOAD PDF VIEW PRESENTATION
