| Citation: | CHEN Suqi, SHAN Yong, ZHANG Jingzhou, et al. Numerical and experimental research on the effect of structural parameters of helicopter infrared suppressor on its performance[J]. Journal of Aerospace Power, 2023, 38（5）：1102-1113 doi: 10.13224/j.cnki.jasp.20210606
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Based on model experiment verification, a numerical simulation method was used to study the effect of the structural parameters of an infrared suppressor’s two-dimensional mixing duct on the overall aerodynamic performance and temperature field of the infrared suppressor. Results showed that: within the scope of the parameters, with the increase of the outlet width of the two-dimensional mixing duct, the pumping coefficient of the two-dimensional ejector nozzle increased first and then decreased, and the average temperature of the bow-shaped baffle cold side increased by 24%. As the expansion angle of the two-dimensional mixing duct increased, the pumping coefficient decreased, and the average temperature of the bow-shaped baffle cold side increased by 3%. If properly extending the length of the straight section of the mixing duct, the pumping coefficient first slowly rose and then decreased, and the temperature change at the bow-shaped cold side was small. The key to improve the pumping coefficient is whether the main flow’s momentum can be effectively used and the flow separation of the main flow can be suppressed. In general, the surface temperature of the bow-shaped baffle cold side is affected by the internal eject flow of the bow-shaped baffle, the stagnation vortex downstream the bow-shaped baffle cold side, and the cold backflow at the narrow edge outlet of the two-dimensional mixing duct.
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