Research Of Aerodynamic Characteristics To Notar Heading Control System

No-tail-rotor (NOTAR) is a new development of directional control system to helicopter, circulation control tail boom and jet cone are two important components to NOTAR directional control system. This paper analysis the principle of operation to circulation control tail boom. Base on the software of CFD this paper presents a two-dimensional aerodynamic analysis model for a circulation control tail boom, study the slit width, momentum coefficient work on the lift of circulation control. An aerodynamic analysis model of directional control system using a jet cone was proposed make use of the momentum theory. By two analysis models for integrated numerical simulation, this paper numerical simulation of aerodynamic characteristics to non-tail rotor helicopter heading control system.Aerodynamic characteristics model of circulation control boom and jet cone is designed and processed which with some parameters can be adjusted, using high-speed large axial flow fan provide low-pressure air flow inside the tail boom. First using probe measurement the total pressure within the tail boom and dynamic pressure in the slit outside the wind tunnel and then carried out the aerodynamic characteristics experiment of circulation control tail boom and jet cone in wind tunnel. Influences of the slit width, the number and size of the jet nozzle on the aerodynamic characteristics of the NOTAR model are studied. The results show that the circulation control tail boom with two slits can produce greater torque; the circulation control tail boom produces less torque than the jet cone. By the calculation results and experimental results were compared to verify the correctness of the calculation model.