外挂式导弹机弹分离气动干扰特性研究

Studies of aerodynamic interference characteristics for external store separation

以经典的机翼/挂架/导弹组合模型为例,采用重叠网格软件系统和计算流体力学技术,从机弹干扰工况简化和气动干扰特性影响因素分析两个方面对外挂式导弹机弹分离气动干扰特性进行研究。导弹分离轨迹参数和气动干扰系数的数值预示结果与捕获轨迹试验结果吻合,表明该计算方法能有效预测机弹分离轨迹和分析导弹与载机间复杂气动干扰现象。根据计算流体力学结果,从马赫数、机翼攻角、导弹攻角等方面,给出导弹在不同分离工况下的气动干扰规律,并采用增量系数法对缺失工况进行一阶外插处理的气动干扰数据外推方法,可应用于机载外挂空基武器的机弹分离轨迹预示和气动干扰特性设计中,具有重要的工程应用价值。

Taking the classic wing pylon finned store model for example,the overset grid system and CFD（ computational fluid dynamics）technology were utilized to study the aerodynamic interference characteristics of the external store separation from two aspects： the interference condition simplification and the analysis of factors influencing aerodynamic interference characteristics. The predicted results of missile separation trajectory parameters and aerodynamic interference coefficients coincide well with the CTS（ captive trajectory system） results,which indicates that the proposed computing method can effectively predict the separation trajectory and complex aerodynamic interference between the missile and aircraft. Based on the results of CFD numerical simulations,the missile aerodynamic interference law of separation can be obtained for different working conditions of mach number,wing angle of attack,missile angle of attack and so on. Furthermore,the incremental coefficient method with first-order heterodyne processing is also obtained to give aerodynamic interference data for the defect working condition. The proposed method can be utilized to predict the separation trajectory and to design the aerodynamic interference characteristics between the missile and aircraft,thus producing great values in practical engineering applications.