抄録
A constant-volume spherical combustion chamber was provided in the experiment to measure the burning velocities of lean homogeneous mixtures of air and methane under microgravity. A 5-m drop tower realized microgravity for about 0.7 second by falling freely the combustion chamber. The burning velocities of mixtures were determined from measured results of the time histories of pressure. It is very important to understand the microgravity level in order to study the degree of a confidence of burning velocities measured by spherical combustion chamber. This study used a cylindrical combustion chamber to observe the behavior of propagating laminar flame in lean flammable mixture under microgravity. It was confirmed that burning velocities measured is of value because the propagating flame is spherical under microgravity.
