关键词: 双旋弹道修正弹, 非对称载荷, 鸭舵, 气动特性, 导引组件

Abstract: The load on dual-spin projectile's body has an asymmetrical characteristic because of the influence from asymmetrical wake flow of canards. The asymmetrical load on the projectile body is studied. The results form computational fluid dynamics (CFD) simulation and wind tunnel test are compared to prove the effectiveness of the CFD method. The dual-spin projectile models with control surface angles of 0°, 2°and 4° are simulated at various Mach numbers and angles of attack. The flow field is qualitatively analyzed by drawing the streamline diagrams of tail flow of canards and the pressure coefficient contour map of projectile body. The asymmetry of force of the projectile body is quantitatively analyzed by comparing the pressure coefficient of body section and the lateral force coefficient of body. The result shows that the body section pressure coefficient of the model with control surface angle of 0° is symmetrical, and the body section pressure coefficients of the model with control surface angles of 2°and 4°are asymmetrical. The projectile body's normal force coefficient curves of three models coincide with each other as the change in the angle of attack at a given Mach number; and the lateral force coefficient is near 0 for the model with control surface angle of 0°, but is approximately linear with the angle of attack for the models with control surface angles of 2° and 4°, and is first ascended and then descended with the Mach number. When the angle of attack is given, the peak value of the model with control surface angle of 4° is about 2 times that of the model with control surface angle of 2° . Key

Key words: dual-spinprojectile, asymmetricalload, canard, aerodynamiccharacteristic, guidancekit