Abstract
The major purpose of the diffuser in the IRS device is to reduce fluid velocity and restore hydrostatic pressure. In order to further optimize the diffuser structure to improve the infrared suppression performance of the IRS device, this paper presents an optimization study of the diffuser of an IRS device with four nozzles. The structural reconstruction of the diffuser funnel uses geometrical parameterization approach where four parameters of the funnel are defined as input variables, including the funnel overlap height, the funnel length, the funnel distance and the funnel inclination angle. A validated numerical simulation method combined with Multi-Objective SHERPA (MO-SHERPA) is employed for shape optimization to increase the entrainment ratio (ER), reduce the temperature ratio (TR) and the pressure drop coefficient (PDC). The results show that the negative overlap of the funnel provides more air entrainment, which gives inspiration for future optimization. Also, the optimal design increases the ER by 10.1% and reduces the TR and PDC by 2.8% and 0.53% respectively compared to the baseline design.
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