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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
Visualization of Pulsed Flow of N2O Using the Resonant Schlieren Method
Submission Author:
Danilo Almeida Machado , SP
Co-Authors:
Danilo Almeida Machado, FERNANDO DE SOUZA COSTA, Dermeval Carinhana Jr, Antonio Carlos de Oliveira
Presenter: Danilo Almeida Machado
doi://10.26678/ABCM.ENCIT2020.CIT20-0210
Abstract
This work describes basic concepts of the resonant schlieren method and presents a discussion on the refractive index in heterogeneous media with light absorption. An experimental setup was assembled to study the pulsed flow of N2O in ambient pressure, using a piezoelectric valve and a resonant schlieren system with a CW Nd-Yag laser in 532 nm and using iodine molecules as seeds in the flow. The results showed that the absorption of light by the iodine seeds in 532 nm makes it possible to increase significantly the contrast of the schlieren images. Therefore, the resonant schlieren method could be used in conditions where the conventional schlieren method does not present adequate contrast, such as in reactive and non-reactive flows in low pressure and in interactions between boundary layers and shock waves.
Keywords
Flow Visualization, Complex Refractive Index, Optical Diagnostics, schlieren
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