Study on Safety Characteristics and Flow Field Mechanisms of Cluster Munition Bay Door Ejection

Taking the multi-petal door and the carrier munition as research subjects, employing the SST k-ω turbulence model combined with overset grid and dynamic mesh techniques, the influence of door centroid position and aerodynamic configuration on ejection characteristics was investigated. Concurrently, flow field topology analysis was utilized to reveal the underlying physical mechanisms governing separation safety within the flow field. The results demonstrate that a forward centroid shift significantly enhances separation safety; the incorporation of internal baffles on the door alters critical flow topology elements (e.g., foci, nodes) within the flow field, which prevents direct impingement of induced airflow on the door trailing edge, facilitating outward rotation of the door leading edge. Quantitative analysis reveals that the variation in vortex intensity along the baffled door edges is markedly smaller than that of the unbaffled configuration, which effectively suppresses vortex breakdown during separation, ensuring continuous attitude evolution.