International Journal of Science, Engineering and TechnologyAuthors: Tat Dat Dong, Van Huong Ngo, Phan Trong Sơn, Phan Lê
Abstract: This paper presents the application of the discrete vortex method to calculating the aerodynamic characteristics of coaxial helicopter rotors. The study focuses on modeling the aerodynamic interaction between the upper and lower rotors, which rotate in opposite directions and create a complex unsteady flow field. Based on the discrete vortex method, the rotor blades are replaced by bound and free vortex segments, allowing the determination of pressure distribution, aerodynamic forces, moments, and thrust coefficients. A computational program was developed to evaluate the influence of initial azimuth angle and horizontal hinge distance on the aerodynamic performance of coaxial rotors. The obtained results provide a scientific basis for selecting geometric and kinematic parameters, supporting aerodynamic analysis, rotor design, and digital transformation in aviation education and research.
