| Citation: | Ma Liang, Dong Yuelu, Han Zhixuan, et al. Effects of structural parameters on the flow characteristics of feedback-free self-excited sweeping nozzles[J]. Journal of Aerospace Power, 2026, 41（X）：20250061 doi: 10.13224/j.cnki.jasp.20250061
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To meet the regulatory requirements for the operational performance of feedback-free self-excited sweeping nozzles across various application scenarios, this paper proposes a parametric design method for such nozzles. A two-dimensional numerical simulation approach was employed to elucidate the effects of structural parameters on the internal flow mechanisms and macroscopic operating characteristics of the nozzle. The study revealed that the formation of self-excited oscillatory flow within the nozzle critically depended on the optimization of three key parameters: the impingement angle, the inlet-to-outlet ratio, and the distance between the impingement point and the outlet. Frequency control exhibited a strong correlation with the impingement angle, impingement point position, and the chamber length-to-width ratio. The frequency characteristics were primarily governed by vortices formed at the geometric dome; reducing the chamber length-to-width ratio, adjusting the impingement angle, and modifying the distance between the impingement point and the nozzle exit enhanced the sweeping frequency. Furthermore, the inlet-to-outlet ratio significantly impacted the sweeping angle and flow characteristics. A decrease in this ratio led to an increase in the sweeping angle and amplified gas-liquid phase velocity gradients. However, it also resulted in increased flow loss.
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