叶片飞脱下转子动力学响应实验

In order to research the dynamic response of the high bypass ratio turbofan engine under fan blade off, and finish the safety design better, the sudden unbalance experimental system with fan blade off device based on similarity theory were designed and experimental verification was finished. Research shows that the sudden unbalance experimental system has high similarity to some demonstration engines, which can finish the sudden unbalance experiment with good repeatability, clear mechanism and big unbalance, furthermore, it can simulate the fan blade off of the engine really. Through the experiment, it was found that when the large sudden unbalance occurred, the superharmonic frequency spectrum appeared and the impact coefficient didn't show a linear relationship due to the limiting effect of the squeezed film damper, so the rubbing problem caused by the limiting should be concerned in the subsequent research.