Validation of momentum source method in the analysis and prediction of the rotor finite ground effect in hover

Abstract

Aiming at the complex flow phenomena with multiple speed scales and the high computational cost constraints of the rotor’s finite ground effect, the momentum source methods to satisfy the computational accuracy and efficiency are developed. Combined with the preconditioning methods, which cope with multiple speed scales, a numerical simulation method for the finite ground effect of the rotor is presented. On this basis, the validity of the numerical method is verified by hovering case firstly. The thrust only slightly increases by 3.26% compared with the experiment. Then, the effects of rotor deviation and height on the aerodynamic performance of the rotor are studied, and a surrogate mode with finite ground effect is established, which is tested by the testing samples on its prediction accuracy. The conclusion shows that the momentum source method can be applied to the analysis and prediction of the finite ground effect of rotor hovering, and the finite ground effect has a significant impact on the overall aerodynamic performance of the rotor.