机翼喷流增升机理的风洞试验研究

Wind tunnel experimental research on lift-enhancing mechanism of jet on wing of aircraft

在西北工业大学NF-3风洞中对以喷气襟翼为基础的运输机新型高效增升系统的机理进行研究。简述了基于喷气襟翼的运输机增升装置、风洞试验装置和试验模型的设计,给出了喷气压力、喷流速度和简单襟翼偏角参数对增升效果和飞机气动性能影响的研究结果。研究表明:以喷气襟翼为基础、结合简单襟翼有可能满足运输机高效增升的要求;下翼面后部喷气不仅在升力方向产生分量,且能有效推迟机翼失速、提高下翼面压力、增加机翼环量,从而增加升力。

The wind tunnel experimental research on the lift-enhancing mechanism of jet on wing of aircraft is performed in three-dimensional testing section of NF-3 wind tunnel at Northwestern Polytechnical University. The design of lift-enhancing device based on jet-flap, its testing device and testing model in wind tunnel is depicted. The influence of jet pressure, jet velocity and deflection angle of simple flap on the lift-enhancing effect and the aerodynamics performance of aircraft is investigated according to the experimental results and its mechanism is analyzed. It is shown from the results that lift-enhancing device with jet-flap is possible to meet the highly lift-enhancing need of the great type transportation aircraft, jet from the retral lower wing surface not only produce the direct lift but also to delay the stall and elevate the pressure of the lower wing surface in order to increase the lift and the disigned lift-enhancing device for the great type transportation aircraft is able to increase the lift of aircraft twice as much as the lift of the basic configuration of the same aircraft.