大規模渦と干渉する拡散火炎の消炎(熱工学,内燃機関,動力など)

概要

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Instantaneous and simultaneous measurements of two-dimensional temperature and OH-LIF profiles by combining Rayleigh scattering with laser induced fluorescence (LIF) are demonstrated in nitrogen-diluted hydrogen (H_2 30% + N_2 70%) diffusion flame interacted with a large scale vortex induced by the acoustic excitation at the fuel side. The dynamic behavior of the diffusion flame extinction and interruption during the flame-vortex interaction processes is investigated. The results obtained are described as follows. (1) When a large velocity fluctuation is given to the fuel jet, the temperature and the OH-LIF at the reaction zone become significantly lowered at the convex and circumferential part of the vortex where the thinning of the OH-LIF and the temperature layer and the consequent flame extinction are induced. (2) The burnt gas is pulled up from the upstream reaction zone by curling up motion of the vortex and high temperature region is formed inside the circumferential reaction zone. The high temperature gas dissipates with time and makes thick burnt gas region. The dissipated burnt gas reduces the supply of fuel into circumferential reaction zone and interruption of the reaction zone is induced.
一般社団法人日本機械学会の論文
2003-05-25