Abstract
In the present study opposed flow flame spread over multiple fuel configurations with thin cellulosic fuels are investigated experimentally in normal gravity and microgravity environments. The thin cellulose fuel (Kim wipes) is configured in different shapes as planar fuel, hollow cylindrical fuel, C- channel fuel, L channel fuel with the help of fuel sample holders and flame spread phenomena is observed over each configuration in normal gravity and microgravity environments at ambient oxygen concentration and 1 atm. pressure. The microgravity experiments are conducted using 2.5s drop tower available at the National Centre for Combustion Research and Development (NCCRD), IIT Madras, India. Over the effective opposed flow speed range of 10 cm/s to 40 cm/s, it is observed that C channel configuration has the highest spread rate compared with other configurations in similar experimental conditions. Further each configuration shows a non-monotonic increasing-decreasing flame spread rate with respect to opposed flow speed.
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