Lattice-Boltzmann Method를 이용한 제자리 및 전진 비행하는 로터 블레이드의 공력해석

Abstract

Numerical analysis of the rotor system has received significant attention due to increased demand and recent developments in Urban Air Mobility (UAM) aircraft with multiple lifting rotors or prop-rotors. In this study, computational analysis was conducted to predict the aerodynamic performance and wake structures of the isolated rotor in the hovering and forward flight conditions using the Lattice-Boltzmann Method (LBM). Caradonna and Tung's rotor was used for the validation model. The thrust and pressure coefficients for various collective pith angles and tip vortex trajectories as a function of wake ages were compared against the measurements. The comparison results showed that the hover performance of the isolated rotor obtained from the LBM simulation was in good agreement with the measured data. Moreover, it was demonstrated that LBM analysis is an efficient way for predicting the cyclic variation in the thrust, asymmetric wake structure, and unsteady vorticity fields that occur in forward flight condition. Calculations showed that LBM simulation is an accurate and efficient prediction method for predicting rotor aerodynamics and wake dynamics, which could be helpful for designing advanced next-generation UAM aircraft.