INVESTIGATION OF VORTEX RING STATE FOR MULTI-ROTOR eVTOL USING VISCOUS VORTEX PARTICLE METHOD

Date

2024-8-16

Author

Şenipek, Murat

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This thesis enhances the previously developed Generic Air Vehicle Model (GAVM) by incorporating a viscous vortex particle method, enabling mid-fidelity rotorcraft analysis. The updated tool, GAVM-VVPM, is a GPU-accelerated platform for simulating and analyzing rotorcraft designs, flight dynamics, and control analysis. The integration of VVPM is validated through extensive test cases. After validation, an aerodynamic investigation is conducted on the Vortex Ring State (VRS) for an eVTOL aircraft. The study examines VRS effects and phases for rotors controlled by either collective pitch or rotational speed. VVPM analyses are applied to an isolated rotor model, assessing aerodynamic performance under various flight conditions. A four-dimensional analysis matrix is developed using vertical and horizontal airspeed, collective pitch, and rotor RPM. The results identify VRS regions associated with thrust loss, negative control derivatives, and increased oscillatory loads. Key points from the VRS envelope are further analyzed through controlled flight simulations using a hexacopter. Design, sizing, and analyses for the hexacopter are performed with GAVM and GAVM/VVPM. Simulations of vertical and oblique descents are carried out to assess the impact of VRS on flight dynamics. After validating isolated rotor VRS maps, the results are applied to a hybrid control architecture with both collective-control and RPM-control. A control index is proposed to optimize rotor control strategies.

Subject Keywords

Viscous Vortex Particle Method, VVPM, Hexacopter, Vortex Ring State, eVTOL, Distributed propulsion, Vertical take-off and landing, Vizkoz Girdap Parçacığı Metodu, Girdap Halkası Durumu, Dağıtık elektrikli itki

URI

https://hdl.handle.net/11511/111290

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Graduate School of Natural and Applied Sciences, Thesis