Parachute aerodynamic coefficient and moment coefficient calculation method and system

Abstract

The invention provides a parachute aerodynamic coefficient and moment coefficient calculation method and system. The method comprises wind tunnel test measurement, numerical simulation correction andtheoretical calculation. Firstly the axial force, the normal force, the moment and the resistance of the connected parachute are measured by the front and back balance through the wind tunnel test under the given incoming flow condition; the wind tunnel test condition is simulated and data simulation of the approximate actual working condition and the actual working condition is performed under the same inflow condition so as to obtain the aerodynamic force of the parachute; the wall influence coefficient k1 and the bracket influence coefficient k2 of the wind tunnel are calculated according to the load on the parachute; and the aerodynamic coefficient and the moment coefficient of the parachute are calculated according to the axial force, the normal force, the moment and the resistance ofthe connected parachute measured by the front and back balance and the wall influence coefficient k1 and the bracket influence coefficient k2 of the wind tunnel. According to the method, the aerodynamic coefficient and the moment coefficient of the parachute can be simultaneously obtained through the test, and the test data can be corrected by using numerical simulation so that the obtained result is more accurate.

Description

technical field [0001] The invention relates to a method and system for calculating the aerodynamic coefficient and moment coefficient of a parachute, wherein the aerodynamic coefficient includes an axial force coefficient, a normal force coefficient, and a parachute resistance coefficient, and belongs to the technical field of aviation aerodynamic deceleration. Background technique [0002] In the aerospace field, the parachute is an important aerodynamic deceleration and stabilization device. The parachute is made of soft and breathable special spinning material. After the parachute is inflated, it has a large resistance area, which can greatly reduce the movement speed of the object, and can also provide stability for the object with resistance. There are generally two ways to obtain the aerodynamic coefficient and moment coefficient: theoretical calculation and experiment. [0003] Under the action of airflow, the shape of the canopy will change significantly, and the f...

AI Technical Summary

Problems solved by technology

Because it generally only installs the aerodynamic force measuring device at one end of the parachute, it can only obtain the drag coefficient of the parachute, but cannot obtain the axial force coefficient, normal force coefficient, and aerodynamic moment coefficient of the parachute, so that the stability of the parachute cannot be obtained. performance data

Moreover, for the airdrop test, the test cost is too high, and the wind tunnel test is difficult to eliminate the influence of the wind tunnel wall and bracket

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