Diagnostic method based on spontaneous emission to evaluate the detonation cycle

Autor(es)

Lopes, Nathan C. ^[1] ; Katata, Carlos C. B. ^[1] ; Marques, Carla S. T. ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Inst Adv Studies, Dept Aerosp Sci & Technol, Aerothermodynam & Hyperson Div, Trevo Cel Av Jose AA do Amarante 1, BR-12228001 Sao Jose Dos Campos, SP - Brazil

^[2] Technol Inst Aeronaut, Dept Aerosp Sci & Technol, Praca Mal Eduardo Gomes 50, BR-12228900 Sao Jose Dos Campos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: EXPERIMENTAL THERMAL AND FLUID SCIENCE; v. 102, p. 261-270, APR 2019.
• Citações Web of Science: 1

Resumo

A study on a hydrogen-fuelled single-cycle pulse detonation device, through pressure and spontaneous emission measurements, was carried out. Detonation initiation was effectively achieved by applying a 65 J microsecond discharge associated with the Shchelkin spiral with very small errors in the diagnostic method. OH{*} and H2O{*} temporal emission measurements were applied at the nozzle exit to establish correlations to specific impulses, determined from pressure curves. OH{*} emission images were also captured to verify detonation propagation at the exhaust. Both the OH{*} and H2O{*} emitters correlated well with the specific impulses, and the integrated areas under emission peak maxima resulted in improved correlations. It was found that the OH{*} amount per kilogram of fuel grows exponentially with the specific impulse based on fuel, while the H2O{*} emission area per kilogram of mixture decays exponentially with the specific impulse, based on the mixture. The OH{*} images demonstrate stable detonation propagations and validate the established correlations. Furthermore, a new optical method was developed for detonation cycle diagnostics. (AU)

• Processo FAPESP: 08/10548-5 - Estudo da detonação pulsada por técnicas ópticas de diagnóstico
• Beneficiário: Carla Simone Tafuri Marques
• Modalidade de apoio: Auxílio à Pesquisa - Regular