| Citation: | WANG Siwei, WANG Yangang, LIU Hanru, et al. Research on the flow characteristics and regulation techniques of ducted fan lip in crosswind conditions[J]. Journal of Aerospace Power, 2025, 40（3）：20220664 doi: 10.13224/j.cnki.jasp.20220664
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Ducted fan powered aircrafts are valued for their excellent efficiency, safety and noise characteristics in the low-speed field. How to reduce the thrust loss and intake distortion at the lip in crosswind conditions needs to be further explored. In this paper, an optimization method for reducing the adverse pressure gradient was used to optimize the lip geometry. The aerodynamic characteristics and flow laws of the original and optimized lips under crosswind conditions were investigated. In order to further improve the ability of the lip to resist crosswind, a double-lip structure was proposed based on the optimized geometry, and the flow control mechanism of the double-lip structure was analyzed. The results showed that the optimization method of reducing the adverse pressure gradient allowed the lip to vary within 3% of the dimensionless thrust and total pressure distortion coefficient over the advance ratio range of 0 to 0.07. The double-lip configuration allowed a further increase in the advance ratio reduced by the lip dimensionless thrust from 0.07 to 0.44. The total thrust reduction of the ducted fan can be reduced from 18.5% to 6.6% by using the double-mouth structure when the advance ratio increased from 0 to 0.55.
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