【摘要】 在3m低速风洞中设计制造了一套动态实验系统,不仅能模拟飞机单自由度机动飞行运动,还能实现模型绕体轴的偏航-滚转耦合运动。通过选择运动参数,可实现绕两个轴运动角速度之间的匹配,满足飞机典型机动飞行所需的绕速度轴的无侧滑偏航-滚转运动。试验测量了BJ-1飞机模型在不同迎角下单独滚转、单独偏航和偏航-滚转耦合运动时的非定常气动特性。结果表明,飞机机动飞行时多自由度运动的气动特性比单自由度运动气动特性复杂,耦合运动时的气动特性与两个单自由度运动的气动特性的叠加结果相比有很大差别。更多还原

【Abstract】 A set of new test apparatus used to measure unsteady aerodynamic characteristics was made in a 3 m low speed wind tunnel at Nanjing University of Aeronautics & Astronautics. The test apparatus can be used to conduct the test of model oscillating in large amplitude pitch, yaw or roll, and the test of model oscillating in large amplitude pitch-roll or yaw-roll around their body-axis. This apparatus can also conduct the model motion around the velocity-axis by adjusting the motion parameters of the model. The unsteady aerodynamic characteristics of the fighter model of BJ-1 are measured when it oscillates in roll, yaw or yaw-roll. Results show that the aerodynamic characteristics of the model oscillating in yaw-roll motion are more complicated than those in single yaw or roll motion and the unsteady aerodynamic characteristics of the model oscillating in yaw-roll motion are different from the sum of the unsteady aerodynamic of the model gained in the test of single yaw and roll motions.更多还原