民用飞机平尾气动载荷计算方法研究

水平尾翼的主要功能是保证飞机具有纵向静稳定性和俯仰可操纵性。民用飞机由于起飞重量大、重心变化范围广,对平尾的操纵性要求很高,为了提高平尾的操纵效率,民用飞机一般采用平尾安定面可微动的设计手段,加上升降舵偏转以及翼身洗流等因素的影响,使得飞行中平尾处的流场变得非常复杂,如何准确或偏保守地确定平尾上的气动载荷一直是民用飞机飞行载荷计算中的一个难点。介绍了民用飞机平尾气动总载荷和载荷分布的计算原理和方法,并提出了如何协调基于测力、测压试验得到的载荷,以及平尾弦向分布载荷的修正方法。

Research on the Aerodynamical Load Calculation of Horizontal Tail of Civil Aircraft

The main function of the Horizontal Tail (H-Tail) is to ensure the static longitudinal stability and the maneuver of an aircraft. The heavy take-off weight and the various CG of the Civil Aircraft make it highly demanded for the control ability of the H-Tail. To improve the efficiency of H-Tail,most Civil Aircrafts adopt deflectable HTails. With the deflection of both the H-Tail and the Elevator,together with the influence of the Wing and the Fuselage,the airstream around the H-Tail is quite complex and makes it difficult to calculate its aerodynamical load. This paper shows how to calculate both the total aerodynamical load and the distributional load of the H-Tail. It alsodemonstrates how to harmonize the total load based on the wind tunnel force tests and pressure tests,and shows some unique methods on how to modify the distributional load.