Characterization of a novel high-efficiency, low-pressure-loss combustor with a Swirler-Strut integrated configuration

Dual variable combustors necessitate high-performance combustion under high flow capacity conditions. This study proposes a new combustor architecture using a swirler-strut integrated configuration, optimizing high combustion efficiency and low pressure loss through a multi-scale vortex coupling design. Systematic investigations on a scaled combustor were conducted to evaluate the effects of blockage ratio ( B _g = 0.54/0.64), dome equivalence ratio ( Ф _dome = 0.52–0.85), and fuel stage ratio (SR = 10 %−20 %) on combustion performance. Results reveal that an elevated Ф _dome induces axial flame extension and expands unburned regions. Combustion efficiency decreases as Ф _dome and SR increase. Conversely, increasing B _g from 0.54 to 0.64 enhances efficiency due to the enlarged strut recirculation zone, thereby improving fuel entrainment. Notably, rising Ф _dome leads to the increase in hot pressure losses, yielding an overall decline in total pressure loss. Following a thorough assessment of the combustion performance index (CPI), the feasibility of high combustion efficiency and low total pressure loss has been verified. This study presents an innovative combustor architecture and elucidates the mechanisms of multi-scale vortex regulation within the swirler-strut integrated configuration. The findings provide theoretical foundations and engineering strategies for the efficient design and broad operational adaptability of the dual variable combustor.