抄録
The influence of Acoustic field on the flame propagation is examined from FDTD (Finite Difference Time Domain) simulation. The influence is evaluated from the two points of view that are the enhanced transfers due to diffusion promotion and that due to convection in acoustic field. The particle velocity of sound is expected to enhance diffusive transport as is often explained through the similarity to turbulent diffusion, both having velocity fluctuations about the mean flows. A thermal convection that occurs when density difference exists in standing acoustic field had been previously found and it enhances convective transfer. To analyze the diffusive and convective influence of acoustic field, flame propagation experiments using a closed chamber, in which strong standing wave is made, is planned. To evaluate the influence of thermal convection, buoyancy convection should be suppressed. Microgravity experiments are expected and a preliminary examination is made using the FDTD simulation. As a result, negligible difference is found in the burning velocity with and without acoustic field in the case a flame started at the middle of velocity node and anti-node. Difference is found when the flame started at the anti-node, which is thought to be caused by the thermal convection.
