Abstract
This paper studies the effects of fluid-thermal-structural interaction on the variable cross-section S-shaped isolator by a self-developed fluid-solid-thermal bi-directional coupling code. The flow field inside the variable cross-section S-shaped isolator is complex with various vortices as the airflow turns. Due to the transition from a crescent shape at the inlet to a circular shape at the outlet, complex vortex structures are generated. The results indicate that the total pressure recovery coefficient and the total pressure distortion index change rapidly at the beginning, and reach steady state at about 200 s. The total pressure recovery coefficient decreases by 4.4%, and the total pressure distortion index increases by 10.5%. Structural temperature, structural deformation, area of cross-sections, wall pressure and average Mach number of mass for cross-sections change over time, and stabilize around 200 s. Increasing incoming Mach number will lead to higher temperatures and deformations in the isolator, greater steady-state cross-sectional area and pressure, higher total pressure loss and more uneven exit flow, as well as lower total pressure recovery coefficients and reductions in total pressure distortion indices. Slowing down the centerline in the isolator structure can weaken the influence of fluid-thermal-structural interaction.
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