可燃性気体吹き出し領域の移動に伴う火炎先端の挙動〔熱工学, 内燃機関, 動力など〕

概要

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An experimental study was performed to explore the characteristics of the leading flame edge of a flame spreading over a combustible material. The movement of the gasifying region of the combustible solid beneath the flame was simulated using a velocity comtrollable apparatus on which a porous plate ejecting combustible gas was installed. Methane, propane, and a methane/air mixture were used as the combustible gases. The characteristics of the leading flame edge were examined by changing the velocity of the apparatus from 0 to 100 cm/s after a stable flame was established over the porous plate. Furthermore, flowfields near the leading flame edges were examined using a particle tracer technique. It was found that the leading flame edge remained stable when the velocity of the apparatus, i.e., the velocity of the leading flame edge, was below a limiting velocity, between 20-30 cm/s in the present experiments (methane and propane). However the behavior of the leading flame edge of the premixed flame (methane/air) was different from at of the methane or propane flame. Although the position of the leading flame edge changed with the velocity, the leading flame edge remained stable to 100 cm/s.
1997-10-25