Fluid-Structure Interaction Study of the Splitter Plate in Turbine-Based Combined-Cycle Inlet System

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Fluid-Structure Interaction Study of the Splitter Plate in Turbine-Based Combined-Cycle Inlet System

Guo, Shuai

AbstractA splitter plate is a key component of the inlet system in turbine-based combined-cycle engines, which divides the whole captured air flow into different engines, namely turbojet and ramjet. The aerodynamic force acting on the thin splitter plate with a single pivot may engender vibration and, in turn, flow-field variations at the start and end of the mode transition phase. A loosely-coupled method was used to simulate the process of fluid-structure interaction. The results showed that the deformation of the splitter plate is, in fact, a process in which the elastic restoring force struggles against the aerodynamic force under the action of damping. At turbojet mode, the splitter plate can attain the maximum displacement of 7.20 mm. The terminal shock was observed to move back and forth in the flowpath. The mass flow rate in turbojet and ramjet flowpaths varied by 5.91 and 44.34%, respectively. At ramjet mode, the inlet fell into the unstart state with a greater displacement of 8.95 mm. The mass flow rate in turbojet and ramjet flowpaths, and slot-coupled cavity varied by 1.69, 23.91, and 51.85%, respectively.