一种融合物理规律的经验工程修正算法研究

Research on Empirical Engineering Correction Algorithm Integrating Physical Laws

为了在飞行器研制初期快速而精准地估算出飞行器气动特性,提出了一种融合物理规律的经验工程修正算法,利用少量计算流体动力学(computational fluid dynamics,CFD)部件气动力系数数据对经验公式的重要参数进行修正拟合,达到提高工程算法计算精度的目的。首先,对数据适用性进行验证,验证了公式来源Missile Datcom计算数据和光弹身飞行器CFD数据的适用性;接着,针对法向力系数,从部件的角度进行剖析,利用少量CFD部件气动力系数数据修正拟合了飞行器部件的气动力系数经验公式,得到不同部件的气动力系数计算方程;最后,通过对比修正公式计算结果和CFD预测集,证明了算法的合理性。

In order to quickly and accurately estimate the aerodynamic characteristics of the aircraft in the early stage of aircraft development,an empirical engineering correction algorithm that integrates physical laws is proposed.The important parameters of the empirical formula are corrected and fitted by a small amount of CFD component aerodynamic coefficient data,so as to improve the calculation accuracy of the engineering algorithm.Firstly,the applicability of the data is verified,and the applicability of the formula source Datcom calculation data and the CFD data is verified;then,the normal force coefficient is analyzed from the perspective of components,and a small number of CFD components are used to correct the aerodynamic coefficient data.The empirical formulas of aerodynamic coefficients of aircraft components are fitted,and the calculation equations of aerodynamic coefficients of the algorithm is confirmed by comparing the calculation results of the revised formulas with the CFD prediction set.