| Citation: | WANG Yibo, LIU Yunpeng, LI Jinghua, et al. Study on performance of annular diffusers in afterburner[J]. Journal of Aerospace Power, 2025, 40（8）：20230062 doi: 10.13224/j.cnki.jasp.20230062
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In order to study the deceleration and diffusion performance of different annular diffusers, the influences of structural parameters and inlet Mach number on the total pressure recovery coefficient of three types of annular diffuser in afterburner were numerically studied under steady-state conditions. The empirical correlation of the total pressure recovery coefficient varying with the structural parameters and inlet Mach number, as well as the performance charts of diffusers, was obtained. The results showed that the losses of annular diffusers mainly included the loss along the path, and the loss of gradual expansion, etc. The relative error between the empirical correlation and the experimental results was within 2.05%, meaning that the empirical correlation can accurately predict the total pressure recovery coefficient of annular diffusers. With the increase of inlet Mach number from 0.3 to 0.55, the static pressure recovery coefficient of annular diffuser increased gradually, and the annular diffusers had strong pressure recovery ability at high inlet Mach number. Compared with the standard annular diffuser, the flow field at the outlet of constant pressure gradient and constant velocity gradient annular diffuser was more uniform, and the energy dissipation caused by viscous shear was lower at the diffuser outlet.
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