| Summary: | Small-scale electronic devices require long hours’ operation and fast charging time. Potential technology to
support requirement of small-scale electronic device is micro scale combustor. Unfortunately, micro scale
combustion is prone to combustion instability. Therefore, objective of this study is to investigate the combustion
characteristics, mechanism that stabilize the flame and combustor performance of the 2-D microchannel combustor
with bluff body having various slit percentages gap. Two-dimensional computational domain with the height and
length of the channel H = 1 mm and L = 16 mm is used respectively. The height of the bluff body is 0.5 mm and
located at 2 mm from the inlet. The slit gap percentage varied in this study is 0% to 70%. The results show that the
combustion characteristic such as stable flame, wavy flame, blow-off, and flame split into two parts is significantly
influenced by the slit gap percentage. Flame is moving downstream and blow-off at the slit percentage of 10% to
25%. At the slit percentage of 30%, the flame zone moves towards the upstream due to the secondary vortex that
exists behind the bluff body as slit gap increases and pushes the flame upstream. The reaction zone is split into two
parts at 60% and 70% slit gap percentage. It is due to the incoming fresh mixture of CH4/air mixture flows through
the slit and cuts the flame zone. It is also found that by increasing inlet velocity beyond 2.0 m/s, the flame becomes
unstable and leads to blow-off as increase in equivalence ratio up to 1.0.
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