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四发螺旋桨飞机滑流影响区较大,需要准确获得滑流引起的升力、阻力和俯仰力矩特性的变化以评估飞机的飞行性能和品质。采用动力模拟风洞实验研究某运输机在滑流影响下的气动力特性,包括升阻特性、俯仰力矩特性和升降舵效率,并采用七孔探针技术测量平尾区的尾流场特性。结果表明:滑流对气流加速的效应使得飞机的升力、阻力均有增加,升阻比在典型巡航和爬升状态下分别降低了6%和20%;滑流随迎角的增加从下至上扫掠过平尾,使得俯仰力矩和升降舵效率出现明显的非线性变化。
Four-propeller aircraft slipstream impact area larger, the need for accurate access to slipstream caused by lift, drag and pitch torque characteristics of change to assess the aircraft’s flight performance and quality. The aerodynamic characteristics of a transport aircraft under the influence of slipstream were studied by dynamic simulation wind tunnel experiment, including the lift resistance, pitch moment and elevator efficiency. The wakefield characteristics of the flat tail zone were measured by seven-hole probe technique. The results show that the effect of slip flow on the airflow accelerates the lift and drag of the aircraft, and the lift-drag ratio is reduced by 6% and 20% respectively under typical cruise and climb conditions. Swept over the horizontal tail, making pitching moment and elevator efficiency showed significant non-linear changes.