Abstract:In order to explore the influence of the ring number on the aerodynamic performance of ringsail parachute, this paper carried out the numerical calculation of the flow field based on CFD method, and the incompressible Navier-Stokes equation is solved by the finite volume method, and obtained the aerodynamic parameters and flow field distribution of the ringsail parachute. By comparing with the airdrop test results, the accuracy of the numerical calculation of the flow field was verified. Based on the above method, the influence of the number of rings on the aerodynamic performance of the canopy is studied respectively for the fixed geometric porosity and the variable geometric porosity without changing the nominal area and the ratio of rings to sails. The results show that the change of the number of rings under the fixed geometric porosity will not cause the great change of the resistance performance and stability performance of the canopy. In the case of variable geometric porosity, the number of rings will affect the stability of the parasail through the geometric porosity and the distribution of wake vortex.