Effect Of Ringsail Parachute Structure Permeability On Aerodynamic Performance

Parachute has been widely used in the recovery process of various payloads for its characteristics of simple structure, low cost, superior performance of deceleration and high reliability. Due to the good performance of inflation, the small loading of opening, the large resistance coefficient, the good stability, parachute small resistance, the good ability to resist the damage, ringsail parachutes are widely applied in the spacecraft recovery and landing. Landing in the recovery process, the aerodynamic performance of the parachutes has a very important impact on the spacial movement, the final landing speed, attitude of manned spacecrafts. In this paper, numerical methods is used for the research of aerodynamic performance on ringsail parachute.According to steady dropping state of full shape of the ringsail parachute, the paper establishes numerical model with CFD method to get the key parameters of drag coefficient, velocity, pressure coefficien, etc. By comparison with the experimental results in the reference, the paper verifies the correctness of the numerical model. Moreover, the flow structure, canopy surface pressure coefficient, aerodynamic coefficient of are discussed in this paper.And then, by adjusting the width of the ring seam, the seam width ratio of the upper and lower crescent seam to change the structure permeability, the aerodynamic performance of ringsail parachute under different structure permeabilities is studied. The paper summarizes the relationship between structure permeability and aerodynamic coefficients between air permeability, and get the polynomial curve fitting about th drag coefficient with the changing of the structure permeability.