Yu-Tang HUANG, Yao-Chen KANG, Zhong-Xuan HE, Tony YUAN, Szu-I YEH

DOI Number: N/A

Conference number: HiSST-2025-214

This study experimentally investigates fuel injection, atomization, mixing, and flameholding mechanisms in a supersonic cavity combustor, focusing on the influence of fuel mass flow rate on flame stability. Cold-flow and hot-ignition experiments were conducted with integrated flow visualization and pressure measurements to examine the relationship between cavity flow structures and combustion behaviour. In the cold-flow experiments, schlieren imaging revealed that at a mass flow rate of 3 g/s, the injected fuel is effectively entrained into the recirculation zone, achieving sufficient mixing, whereas at 4.5 g/s and 6 g/s, significant fuel retention within the shear layer reduces atomization efficiency and
results in locally fuel-rich conditions. Under hot-ignition conditions, stable flameholding was observed at 3 g/s, while higher flow rates led to fuel accumulation and unstable combustion. These findings demonstrate the strong correlation between fuel mass flow rate, atomization efficiency, shear-layer dynamics, and flameholding stability, offering experimental insights into flame stabilization mechanisms for future supersonic combustor design.

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In Categories: 1.Events, 1.HiSST 2025, Propulsion Systems & Components
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