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

摘要

As an engineering software for calculating theaerodynamic parameters of aircraft, Missile DATCOM iswidely used in the design and demonstration stage of aircraftresearch. In this paper, a 2-dimensional (2D) trajectorycorrection projectile is taken as the research object, and theDATCOM calculation accuracy is analyzed. The results showthat in the software parameter setting, although method 1describes the body is not accurate enough, its own geometrygenerators can accurately describe the body contour. Theaerodynamic parameters calculated by this method are moreaccurate than method 2. The aerodynamic parameters of the 2Dtrajectory correction projectile calculated by DATCOM have alarge 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 greatlyreduce the system error. After the error compensationcorrection, the axial force coefficient (CA) error is reduced toless than 3%, and the normal force coefficient (CN) error and thepressure center position (XCP) error are generally reduced towithin 10% and 5%, when the sideslip angle is 0°. When thesideslip angle is less than 4°, the CA error is less than 5%, andwhen the sideslip angle ( ? ) is less than 1°, the main data error ofCN is less than 15%, and the main data error of XCP is less than25%. These errors meet the engineering calculation accuracyrequirements. This method cannot completely replace windtunnel tests and computational fluid dynamics (CFD) simulationcalculations, but it can greatly reduce the number of wind tunneltests and the CFD simulations, and has strong application value.