| Citation: | BAN Runze, DONG Lin, RINOSHIKA Akira, et al. Numerical simulation of flow-field regulation mechanisms in swirlers via bionic blades[J]. Journal of Aerospace Power, 2025, 41（X）：20250335 doi: 10.13224/j.cnki.jasp.20250335
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The development of novel swirlers represents a critical breakthrough for enhancing the lean blow-off limit of combustion chambers and optimizing flame stability under typical operating conditions. Based on a numerical approach, the characteristic evolution of a dual-stage counter-rotating swirler was systematically investigated by incorporating biomimetic features inspired by winged seeds within the cold-flow field of a combustor. By analyzing the control mechanisms of the main and pilot stage blade design types on the central recirculation zone (CRZ), the influences of different blade combinations and trailing-edge thickness variations on the topological characteristics of the cold flow field were revealed. Results indicated that the blade combination scheme of the main and pilot stages significantly affected the vortex core extent and velocity distribution within the CRZ. When the trailing-edge thinning ratio reached a critical value between 40% and 60%, the growth rates of both the vortex core area and the recirculation velocity exhibited a nonlinear decay trend with the increasing thinning ratio, yet maintained a positive correlation. Specifically, employing the biomimetic design for the main stage blades contributed to an expanded vortex core region and an increased recirculation velocity, with its dominant influence on the CRZ concentrated within the spatial domain of 0.3≤
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