音場での燃焼機構解明研究チームの落下実験成果報告

摘要

As an activity of the research team for investigation on combustion mechanisms in acoustic fields, an optical observationsystem is developed and examined using MGLAB drop shaft. An LED Schlieren optics is fitted to the shared apparatusfor high pressure combustion that is under development for space use. A very dim flame of lean hydrogen-airpremixture (0.17 in equivalence ratio) is employed as a sample of visualization. The flame is acoustically excited byusing counter-acting loud-speakers. The flame propagation is observed using the optics and a high speed video camera.The influence of acoustic field on the flame propagation is evaluated. As results, the flame front is successfully detectedwith the optics and the expected deformation of flame and change in propagation speed due to thermo-acoustic streamingis detected.