Research on the Correction Method of Resistant Coefficient for Projectile on Plateau

Abstract

In order to solve the problem of low accuracy of plateau trajectory calculation caused by inaccurate aerodynamic parameters, a correction method for plateau resistence coefficient of projectile based on numerical calculation and parameter identification of test data was proposed. The influence mechanism of Reynolds number change on the resistence coefficient of projectile was analyzed. Taking a certain type of projectile as the object, the variation laws of resistence characteristics at different altitudes were compared and analyzed through the numerical calculation of aerodynamic flow field and the identification calculation of resistence coefficient of firing tests at different altitudes, and the modified calculation model of resistence coefficient corresponding to different Reynolds numbers was established. Based on the aerodynamic identification results of plain resistence coefficient, the more accurate acquisition of plateau resistence coefficient of projectile was realized by modifying the resistence coefficient of Reynolds number at different altitudes. The test results of a certain type of resistence, a certain type of rocket and a certain type of mortar shell show that the plateau resistance coefficient obtained by this correction method is closer to the actual situation, and the trajectory calculation results are in better agreement with the firing test results. Compared with the traditional calculation method, the calculation accuracy is improved by 2~6 times. This method has certain generality, and the research results provide theoretical guidance and technical support for compiling accurate plateau firing table.