Numerical Simulation Of Fluid Structure Interaction For The First Stage Impeller In Centrifugal Compressor With Large Flow Rate

Turbo-machinery is widely'used in industrial production sector, and it plays an indispensable role in aviation, aerospace, petroleum, chemical, energy, power and defense fields. With the development of science and technology, turbo-machinery is moving towards high-speed, heavy-load and automatic, which sets strict demands on its speed, capacity, reliability, efficiency and security. Nowadays, a single physical field of numerical simulation has been difficult to meet requirements of performance and reliability for turbo-machinery. Therefore, the fluid-structure interaction (FSI) problem of turbo-machinery is quite new and significant subject in fluid machinery field.Large centrifugal compressor is an important part of turbo-machinery, because it measures the development level of a country for its hi-tech industry. According to the structural characteristics of large compressor, finite element analysis (FEA) of the impeller has been much more important. In this paper, the first stage impeller of a domestic large flow centrifugal compressor is presented, the use of FEA software ANSYS Workbench Environment (AWE), numerical simulation of FSI and modal analysis for the impeller are carried out. The results indicate that the blade leading edge appears maximum deformation and maximum vibration amplitude, so that resonance is most likely to occur. As a result, with unsteady aerodynamic load and other long-term effect of the exciting force on the impeller, it is very possible to cause high-cycle fatigue fracture at the leading edge.As the fluid-structure interaction (FSI) problem of turbo-machinery is a most complex coupling, and there are few solutions for turbo-machinery coupling at present. Therefore, the result of FSI analysis is not only of importance to improve the performance, structural strength and vibration characteristics of the centrifugal compressor, but also has a great influence on its reliability, security and working life. Moreover, this study on FSI of compressor is of great significance to solve turbo-machinery FSI problem (such as nuclear reactor coolant cycling pumps, last stage blades of steam turbine, gas turbine, etc.), as well as engineering projects related to FSI issues.