关键词:  , 发动机布局；气动弹性；旋转颤振；陀螺力矩；稳定性

Abstract: This study investigates the effects of structural parameters and engine layout on the whirl flutter characteristics of turboprop aircraft, considering respectively propeller rotational speed, engine pylon-wing connection stiffness, and engine layout on the whirl flutter characteristics. A distributed engine layout configuration was established based on the baseline configuration to explore the influence of the number of engines on the whirl flutter velocity of the model under this layout configuration. The results show that when the propeller rotational speed exceeds a critical value, the whirl flutter velocity of the model drops to a hazardous level. A decrease in the difference be鄄 tween the pitch and yaw stiffness of the nacelle attachment structure leads to a decrease in the whirl flutter velocity of the model. As the engine moves toward the wingtip, the classical wing flutter velocity reaches its maximum with the engine located at 0.52 of the half-span. The model′s whirl flutter velocity increases slowly as the engine moves toward the wingtip and peaks at 0.59 of the half-span, while further wingtip movement of the engine conversely re鄄 duces the whirl flutter velocity. Numerical calculations indicate that compared with the baseline configuration, the distributed engine layout configuration can significantly improve the classical wing flutter velocity with a slight in鄄 crease in whirl flutter velocity.

Key words: enginelayout, aeroelasticity, whirl flutter, gyroscopic moment, stability