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CHARACTERISTICS OF PRECESSING VORTEX CORE IN THE LPP COMBUSTOR MODEL

Paulo M. Anacleto
Department of Mechanical Engineering, Instituto Superior Tecnico Av. Rovisco Pais, 1049-001 Lisboa Codex, Portugal

Edgar Fernandes
Instituto Superior Tecnico

Manuel V. Heitor
Instituto Superior Técnico, Technical University of Lisbon, Department of Mechanical Engineering, Av. Rovisco Pais, 1096 Lisboa, Codex, Portugal

Sergei I. Shtork
S. S. Kutateladze Institute of Thermal Physics, Siberian Branch of the Russian Academy of Sciences, 1 Academician Lavrent'ev Ave., Novosibirsk, 630090, Russia

Resumo

This work is devoted to the study of swirling flow in a model LPP combustor with the purpose of choosing optimal boundary conditions that may lead to low NOx emission at high fuel efficiencies. In this context, experiments, conducted on a LPP chamber, under non-reacting and reacting conditions, have revealed the presence of a swirl jet breakdown zone and a flow pulsation caused by hydrodynamical instability in form of PVC. Parameters of vortex flow with the PVC, such as precession frequency and swirl level defined through measured radial pressure gradient, were used to characterize flow regime and to choose optimal combustor configuration.
Good performance of LPP combustor corresponds to swirling flow regime with the developed and stable recirculation zone defined according to characteristic maps for frequency and pressure drop measurements at isothermal conditions.