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Velocity and NO-lifetime measurements in an unseeded hypersonic air flow

[+] Author and Article Information
Pedro A. de S. Matos

Energy, Propulsion and Combustion Laboratory Department of Propulsion Aeronautics Institute of Technology São José dos Campos, São Paulo 12228-900Laboratory of Aerothermodynamics and Hypersonics Institute for Advanced Studies São José dos Campos, São Paulo 12228-001
pedrosmatos@gmail.com

Luiz Gilberto Barreta

Laboratory of Aerothermodynamics and Hypersonics Institute for Advanced Studies São José dos Campos, São Paulo 12228-001Energy, Propulsion and Combustion Laboratory Department of Propulsion Aeronautics Institute of Technology São José dos Campos, São Paulo 12228-900
barreta2@gmail.com

Cristiane Aparecida Martins

Energy, Propulsion and Combustion Laboratory Department of Propulsion Aeronautics Institute of Technology São José dos Campos, São Paulo 12228-900
cmartins@ita.br

1Corresponding author.

ASME doi:10.1115/1.4039863 History: Received August 08, 2017; Revised March 26, 2018

Abstract

A LIF-based nitric-oxide flow-tagging technique was applied to measure both velocity and NO lifetime in a hypersonic shock tunnel from two experimental test runs. The results were supported by an analytical profile proposed in this paper that provides a way to correct displaced measurements due to unknown systematic error sources. This procedure provided velocities with discrepancies lower than 3% for a total of five measurements, and lower than 2% when compared with those obtained from a linear fit. Additionally, the comparison between the proposed and experimental profiles allowed us to obtain the fluorescence NO lifetime from only one image.

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