| Citation: | WANG Yong, Eriqitai, KONG Bo. Flow and thrust characteristics of annular slot dual-bell nozzle[J]. Journal of Aerospace Power, 2026, 41（3）：20240288 doi: 10.13224/j.cnki.jasp.20240288
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In view of the aspiration drag of dual-bell nozzles and the thrust loss problem such as premature mode transition, an annular slot dual-bell nozzle with an ejection annular slot added at the nozzle inflection point was designed. The flow and thrust characteristics of a dual-bell nozzle with an extension nozzle of positive pressure gradient and a dual-bell nozzle with an annular slot were investigated using numerical simulation methods. The results showed that the annular slot dual-bell nozzle can effectively improve the thrust performance of the dual-bell nozzle under low nozzle pressure ratio conditions and its mode transition pressure ratio. The shear layer momentum transport between the mainstream and the ejected airflow acted as an important reason for increasing the thrust of the annular slot dual-bell nozzle, and the sneak transition also existed in the annular slot dual-bell nozzle. Compared with the dual-bell nozzle, the thrust coefficient increased by 2.9% in the sea level mode, increased by 10.4% in the mode transition process, and reduced by 0.2% in the altitude mode influenced by the annular slot structure. Compared with the base nozzle, the altitude average specific impulse of the annular slot dual-bell nozzle increased by 1.7% within the 0—30 km altitude range.
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