Design and simulation study of a new type of adjustable nozzle mechanism

DOI:	10.11809/bqzbgcxb2025.01.006
Keywords:	origami principle; adjustable nozzle; kinematic analysis; aerodynamic characteristics
Abstract:	The weapon systems with high infrared stealth performance play a crucial role in modern aerial warfare. The stealth principle of these systems involves altering the shape of the nozzle outlet to reduce the infrared signature generated by the aircraft, thereby decreasing the probability of detection. To achieve adjustable and controllable nozzle outlet area, a novel adjustable nozzle based on the origami principle is designed. Firstly, the closure law of the nozzle is simplified using the origami principle, and a three dimensional model of the multi mechanism unit is constructed, followed by kinematic modeling to obtain the kinematic characteristics of the nozzle. Next, numerical simulation and virtual prototype simulation are employed to compare the variation patterns of the nozzle outlet area in the adjustable nozzle mechanism, verifying the rationality of the kinematic model established for the mechanism. Finally, aerodynamic characteristics of the nozzle are simulated to analyze the comprehensive aerodynamic performance under different outlet area conditions. The results demonstrate that this design can rapidly achieve adjustment and closure of the nozzle outlet area, with a control law error of less than 1%, ensuring stable and satisfactory motion characteristics. The thrust coefficients for nozzle throat areas of 0.6 m2 and 0.3 m2 are 0.993 and 0.977, respectively, indicating superior comprehensive aerodynamic performance. The design approach based on the origami principle provides new insights for the design of adjustable nozzles, offering technical support and theoretical basis for subsequent production practices.
Issue:	Vol. 46 No. 1 (2025)
Published:	2025-01-31
PDF