高温空気流中におけるPMMA円柱の着火現象(熱工学,内燃機関,動力など)

概要

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Ignition process and burning characteristics of a polymethylmethacrylate (PMMA) rod in highly preheated convective environment are investigated experimentally. The main parameters are O_2 concentration, flow velocity, preheated air temperature and oxygen dilution gas. The convective ignition can be classified into three steps : blue flame generation, attached flame formation and envelope flame development. Convective ignition of PMMA suddenly exposed to high temperature air is initiated in downstream and dim blue premixed flame is formed there. When the pyrolysis of solid fuel increases enough for flame propagation, the blue flame propagates to upstream to form an attached flame or luminous envelope flame. The ignition delay time is almost independent on oxygen concentration because the initial blue flame formation process is mainly controlled by pyrolysis rate. However, the following attached flame and envelope flame formation time increases with decrease in the oxygen concentration since these processes are chiefly dominated by burning velocity.
社団法人日本機械学会の論文
2003-02-25