Comparative Numerical Study of Film Cooling Strategies for Thermal Protection of a Kerosene-Fueled Oblique Detonation Combustor
Abstract
Thermal protection remains a major challenge for oblique detonation engines (ODEs), whose combustors combine intense heat release, anchored on oblique detonation waves (ODWs). This study numerically investigates the effects of coolant type and mass flow rate on the flow structure, thermal environment and propulsion performance of a film-cooled kerosene-air ODE combustor at Mach 10 and 15 km altitude. Three active cooling strategies are compared under identical conditions: air film cooling, gaseous-kerosene film cooling, and liquid-kerosene mist cooling. Stable, wall-attached oblique-detonation propagation and the canonical wave structure are maintained, with the wave-coolant interaction depending systematically on the coolant medium. Air injection causes the greatest disturbance to the initiation region and downstream wave interactions, yielding the largest propulsion penalty. The cooling strategies substantially reduce the near-wall thermal load but produce distinct wall-temperature distributions. Gaseous-kerosene cooling yields a spatially periodic response from the discrete injection slots, whereas liquid-kerosene mist cooling gives a smoother and lower near-wall temperature through two-phase mixing and phase-change heat absorption. Liquid-kerosene mist cooling provides the most favorable balance between thermal protection and propulsion performance at low to moderate injection levels. With further increases in injection level, the thermal benefit approaches saturation while the propulsion penalty continues to grow: the mean near-wall fluid temperature reduction remains about 87% across both the inter-slot and cooling-slot wall segments, whereas the total specific impulse is reduced by about 3%-5%. These results quantify the thermal-propulsive trade-off across film-cooling media and demonstrate the potential of fuel-based cooling for thermal management in hypersonic ODE combustors.
Versions
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BibTeX
@misc{li2026comparative,
title = {{Comparative Numerical Study of Film Cooling Strategies for Thermal Protection of a Kerosene-Fueled Oblique Detonation Combustor}},
author = {Jianghong Li and Songbai Yao and Wenwu Zhang},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2605.05874},
eprint = {2605.05874},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2605.05874},
}
RIS
TY - UNPB
TI - Comparative Numerical Study of Film Cooling Strategies for Thermal Protection of a Kerosene-Fueled Oblique Detonation Combustor
AU - Jianghong Li
AU - Songbai Yao
AU - Wenwu Zhang
PY - 2026
DA - 2026/10/14
PB - arXiv
DO - 10.48550/arxiv.2605.05874
UR - https://arxiv.org/abs/2605.05874
AB - Thermal protection remains a major challenge for oblique detonation engines (ODEs), whose combustors combine intense heat release, anchored on oblique detonation waves (ODWs). This study numerically investigates the effects of coolant type and mass flow rate on the flow structure, thermal environment and propulsion performance of a film-cooled kerosene-air ODE combustor at Mach 10 and 15 km altitude. Three active cooling strategies are compared under identical conditions: air film cooling, gaseous-kerosene film cooling, and liquid-kerosene mist cooling. Stable, wall-attached oblique-detonation propagation and the canonical wave structure are maintained, with the wave-coolant interaction depending systematically on the coolant medium. Air injection causes the greatest disturbance to the initiation region and downstream wave interactions, yielding the largest propulsion penalty. The cooling strategies substantially reduce the near-wall thermal load but produce distinct wall-temperature distributions. Gaseous-kerosene cooling yields a spatially periodic response from the discrete injection slots, whereas liquid-kerosene mist cooling gives a smoother and lower near-wall temperature through two-phase mixing and phase-change heat absorption. Liquid-kerosene mist cooling provides the most favorable balance between thermal protection and propulsion performance at low to moderate injection levels. With further increases in injection level, the thermal benefit approaches saturation while the propulsion penalty continues to grow: the mean near-wall fluid temperature reduction remains about 87% across both the inter-slot and cooling-slot wall segments, whereas the total specific impulse is reduced by about 3%-5%. These results quantify the thermal-propulsive trade-off across film-cooling media and demonstrate the potential of fuel-based cooling for thermal management in hypersonic ODE combustors.
ER -