INVESTIGATION OF THE LONGITUDINAL CHARACTERISTICS OF A LARGE-SCALE JET TRANSPORT MODEL EQUIPPED WITH CONTROLLABLE THRUST REVERSERS

摘要

An investigation was conducted to determine the effect of thrust control by means of controllable thrust reversers on the longitudinal characteristics of a large-scale airplane model with a 35° sweptback wing of aspect ratio 7 and four pylon-mounted jet engines. The model was equipped with target-type thrust reversers designed to provide thrust control ranging from full forward thrust to full reverse thrust. The use of thrust control in landing-approach configurations formed the major portion of the study. Results were obtained with both leading- and trailing-edge high-lift devices. Lift, drag, and pitchiug-moment coefficients arid reverser effectiveness data are presented. Test Reynolds numbers ranged from 4.2 to 8 million.nExamination of the data indicates that thrust control by means of thrust reversers can bring about a deterioration of longitudinal characteristics when reverser closure is more than 40 percent. However, analysis indicates that with closure up to 40 percent the reversers can provide a significant improvement in landing approach performance.