平尾翼型后加载对飞机配平的影响研究

EFFECTS OF AFT-LOADED EMPENNAGE AIRFOIL ON AIRCRAFT TRIM

利用MGAERO软件对搭配不同尾翼模型的某典型布局客机翼身组合体流场进行了计算,研究了平尾翼型后加载对全机配平的影响.分析表明,采用后加载设计的平尾翼型在配平时升力和阻力损失较小,配合其他手段可以提高全机升阻比,进而改善全机配平后的气动性能.这一结论从流场计算的角度揭示了客机平尾翼型采用后加载设计这一发展趋势的重要原因.

This paper analyzes the effects of aft-loaded empennage airfoil on the aircraft global trim through CFD （computational fluid dynamics） methodology, using MGAERO software and a basic fuselage-wing model of a typical civil aircraft of several different empennage modes. The calculation results indicate that the empennage of aft-loaded design would cause less loss of the lift and drag after the global trim of the aircraft, which would lead to some gains in the overall lift/drag ratio and aerodynamic performance with some combined effect such as twist. The theoretical evaluation of the gains is provided. This paper reveals the root cause of the trend that aft-loaded design is preferred for the empennage airfoil on the civil aircraft, and also shows that the overall drag including the trim part is important in the assessment of aircraft drag performance.