Accuracy Analysis of Aerodynamic Calculation of 2-Dimensional Trajectory Correction Projectile Based on DATCOM

As an engineering software for calculating the aerodynamic parameters of aircraft, Missile DATCOM is widely used in the design and demonstration stage of aircraft research. In this paper, a 2-dimensional (2D) trajectory correction projectile is taken as the research object, and the DATCOM calculation accuracy is analyzed. The results show that in the software parameter setting, although method 1 describes the body is not accurate enough, its own geometry generators can accurately describe the body contour. The aerodynamic parameters calculated by this method are more accurate than method 2. The aerodynamic parameters of the 2D trajectory correction projectile calculated by DATCOM have a large system error compared with the wind tunnel test data. This paper proposes a system error compensation method (SECM) to compensate the calculated data, which can greatly reduce the system error. After the error compensation correction, the axial force coefficient (CA) error is reduced to less than 3%, and the normal force coefficient (CN) error and the pressure center position (XCP) error are generally reduced to within 10% and 5%, when the sideslip angle is 0°. When the sideslip angle is less than 4°, the CA error is less than 5%, and when the sideslip angle (β) is less than 1°, the main data error of CN is less than 15%, and the main data error of XCP is less than 25%. These errors meet the engineering calculation accuracy requirements. This method cannot completely replace wind tunnel tests and computational fluid dynamics (CFD) simulation calculations, but it can greatly reduce the number of wind tunnel tests and the CFD simulations, and has strong application value.