Fluid-Structure Interaction Static Strength Analysis Of A Certain Compressor Stage Blade

The strength analysis of blade, which is an important part of compressor energy transformation, has always been the focus in impeller mechanical field at home and abroad. Blade is under enormous centrifugal force, aerodynamic force, flexural moment, vibration, etc., so it is prone to all kinds of failures. It will be a serious threat to the entire unit operation once failure or even fracture happens, and may even lead to major accidents, causing serious economic losses and personal injuries. The design quality of blade structure directly affects the compressor and even the whole gas turbine safety, durability and reliability, etc. For the blade structure and load are rather complex, and have a high degree of coupling, it is necessary to carry on the fluid-structure interaction calculation to get a more realistic simulation result.Based on CFD in this paper, a compressor stage of a ground-based heavy-duty gas turbine is analyzed on static strength. Considering the compound action of aerodynamic and centrifugal load, one-way fluid-structure interaction on this stage under different conditions is simulated, using ANSYS CFX and ANSYS Workbench.Total deformation and equivalent stress of the blade with three kinds of load, which are aerodynamic load, centrifugal inertia force load and the coupling of both loads are studied at design condition according the results. Moreover, the maximum total deformation and the maximum stress under different conditions which is aerodynamic load, coupled aerodynamic load and centrifugal inertia force load are compared. The characteristics of the deformation and stress of blade at the three load conditions is obtained. The influence of vary conditions on the maximum total deformation and the maximum equivalent stress of the blade are observed.Besides, without any experiment, in order to validate of the numerical simulation results, the engineering experience formula on the rotor blade is compared with the simulation results. It shows that the results of the two methods are basically coincident, and the maximum difference is under 14%.