Coupling Effect Of Composite Blade Under Fluid Structure Interaction

The composite blade under fluid field model was built in this paper. Both the computational fluid dynamics (CFD) and fluid-structure interaction (FSI) method was adopted to simulate the response of the blade under fluid force. The bend-twist coupling (BTC) effect of composite blade occurs under such load condition. The simulation using CFD and FSI method were carried out by Abaqus/CFD module and co-simulation with Abaqus/Standard and Abaqus/CFD module separately. The results show that the CFD and FSI model pressure distribution is quite the same, but pressure slope along the blade ring direction is different. The maximum pressure difference is 7.5%. When under the working condition, the twist angle and deformation at the blade tip of the FSI model would reach 1.7 degrees and 2.4mm, which would result in the blade efficiency drop. The stress concentration basically lies in the blade root region. The main in-plane and out-plane stress is sigma(11) and sigma(13) mostly lies in the blade root near the leading edge. And sigma(23) that is the cause of blade twist mostly lies in the blade root near the leading and trailing edge.