Aeroelastic Study of the Splitter Plate in Turbine-Based Combined-Cycle Inlet

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Aeroelastic Study of the Splitter Plate in Turbine-Based Combined-Cycle Inlet

Qin, Qihao / Xu, Jinglei / Guo, Shuai

A two-dimensional over–under turbine-based combined-cycle inlet system that exhibits the fluid–structure interaction phenomenon is investigated at both design and off-design states. The mesh-based parallel code coupling interface is used to perform a two-way loosely coupled data exchange across the fluid–structural interfaces. Results indicate that, although the performance variation is limited at a ramjet mode with ${M a}_{0} = 2.5$ , unexpected limit cycle oscillations appear accompanied by unsteady amplitudes. Moreover, a remarkable unstart delay along with the deceleration process of performance deterioration can be observed when the backpressure goes through a rapid increase, where the upward deformation of the splitter plate plays a significant role in resisting the downstream disturbance. In contrast, the fluid–structure interaction effect leads to an earlier occurrence of inlet unstart when the angle of attack varies periodically, and it induces limit cycle oscillations at a higher varying frequency. The study reveals the necessity of attaching more importance to the aeroelastic behavior of the splitter plate in the future research and operation of the over–under turbine-based combined-cycle inlet system.