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This work employs ANSYS fluent CFD tool to calculate thrust generated a rotor covered by a ring surface using in UAV. The aim of this paper is to characterize the effects of geometry parameters of the ring surface such as diameter and height on the thrust of the rotor. | Journal of Science & Technology 130 (2018) 055-059 Effect of Ring Surface Design on the Thrust of a Rotor using in Multirotor UAV Thai Thai Son, Vu Dinh Quy* Hanoi University of Science and Technology - No. 1, Dai Co Viet, Hai Ba Trung, Hanoi, Viet Nam Received: May 02, 2018; Accepted: November 26, 2018 Abstract This work employs ANSYS fluent CFD tool to calculate thrust generated a rotor covered by a ring surface using in UAV. The aim of this paper is to characterize the effects of geometry parameters of the ring surface such as diameter and height on the thrust of the rotor. Firstly, the simulations of a full-open rotor at different RPMs is carried out. The results are compared to experiment results to validate the numerical model. Then, the simulations of the rotor covered by a ring surface with different geometry parameters are carried out. The results show that changing diameter of the ring surface leads to thrust generated by rotor also changing. With an increase in the ring surface height thrust increase up to a certain value and stabilizes. Keywords: Multirotor, ring surface propeller, ring surface, thrust. 1. Introduction* theory it can be more efficient than a usual helicopter with one fully opened rotor. A model of a ring surface propeller was calculated [3]. The theoretical calculation shown that the efficiency was 167.5% as compared to opened propeller. However, the effects of the geometry of the ring surface and its weight were not investigated. Nowadays, unmanned aerial vehicles (UAV) have a huge potential in both military [1] and civilianlife. UAVs can carry out work conditions where the surrounding environment is dangerous or not available to human. Among many UAVs types, multirotor UAVs have exclusive capabilities like hovering, vertical takeoff and landing, limited launching spaces and good maneuvering. There is a wide range of applications performed by multirotor UAVs, such as police, rescue and firefighter need, research, cinematography and
