Fluid-Structure Interactiong-based Vibration of Rotating Blades and Its Influence on Blade Tip Timing
Blade tip timing(BTT)is an advanced online vibration monitoring method for rotating blades,but its measurement accuracy is greatly affected by the change of the sensing position.Therefore,how to select appropriate sensing points has important research value.In order to explore the impact of blade vibration on the sensing position under fluid-structure interaction,vortex steps were generated in the flow field around a cylinder and the torsional vibrations of rotating blades under different speeds and crack posi-tions were studied.Torsional vibrations of normal blades and cracked blades were calculated and compared under different centrifugal loads and fluid-structure interaction.Furthermore,the effects of the torsional off-set at the blade tip on the BTT sensing position were discussed.The simulation results show that the rota-tional speed and crack location have significant impacts on the torsional vibrations of the rotating blade under fluid-structure interaction.When the speed is low,the BTT vibration sensor should be installed near the leading edge of the blade.When the speed is high,it should be installed in the middle position near the blade tip.
tip timingvibration monitoringrotating bladesensing positionfluid-structure interaction
万方数据
维普
