| Compressors or fans of which the blade dynamic stability influences the normal operation areimportant parts of turbomachine. Among the factors that affect the dynamic stability of blades,flutter is the one of the most prominent. Thus analysis of the flutter stability at the design stage ofthe blades is of great significance. In this paper, ANSYS/CFX are using as a simulation tool toresearch the blade flutter. The FSI (Fluid Structure Interaction) in the discrete time steps is simulatedwith staggered coupling method and the vibration of the blade are recorded in time domainto assess the dynamic stability. Firstly the simple straight blade cascade’s flutter stability isanalyzed with the flow velocity, mass ratio, inlet angle and blade tip clearance as the affectingvariables, and the energy method is used to check stability; Secondly the NACA0012airfoilblade flutter is calculated and the mechanism of flutter has been studied. Thirdly one actual blade’sdynamic stability in the nominal operating conditions is analyzed.Currently the flutter stability is analyzed by simulation and experimental testing, and modelupdating involves the both aspects. Model updating uses experiments data to modify the analysismodel, and thus to make results of simulation calibrated. Since the flutter testing cost very much, andit’s difficult to carry out experiments, this paper uses the virtual testing method to update the finiteelements model of the structure in FSI, providing a novel method for the numerical simulationof flutter analysis. |
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