Blade Response Analysis Of Centrifugal Compressor Impeller Based On Fluid-solid Interaction Method

The turbocharger after years of development, whether in the aerodynamic performance and structure design, has greatly improved, now widely used in aviation, Marine, automotive and other fields, objective economic benefits have been achieved As we know that the centrifugal compressor has wide application in the existing diesel engine turbocharger. The impeller is one of the most important component of the centrifugal compressor, its internal flow is very complex. Therefore it is of great significance to understand the internal flow situation of the centrifugal compressor to design the high-performance air compressor and high-performance turbocharger. The impeller work in a complex environment, a variety of loads, In order to ensure safe and reliable operation, so it is necessary to carry on the fluid structure interaction analysis in order to get a more realistic and accurate numerical.The numerical simulation of the flow field for the centrifugal compressor, which is used in turbocharger of certain marine diesel engine by CFX software. Analyzed the impeller flow channel and the diffuser flow field distribution inside the port, after comparison with the experimental data, verified that the numerical simulation method we use is accurate. calculate the different conditions on the rate and efficiency. With three different profile data of CAD drawings, use three-dimensional solid modeling software CATIA to establish the model of the diffuser, use numerical simulation analysis compared the performance of three kinds of diffuser, for diffuser frontal gas separation, the diffuser vane inlet installation angle increases 3°, significantly improved performance at the speed of 24156r/min, measures are put forward to make compressor efficiency at the mass flow rate 4.8kg/s, increased 6.84%, overall diffuser restructuring improved the performance.In order to acquire the more real detailed stress status of centrifugal compressor impeller with splitter blade, use ANSYS do an one-way fluid solid interaction analysis of compressor impeller and blade, use the software more physical field coupling platform to implement the pressure data transmission, maximum stress and deformation distribution of the impeller which were acted simultaneously by the centrifugal and aerodynamic force, were acquired, get the stress-strain nephogram of the compressor blades, compared the aerodynamic force, centrifugal effect on compressor stress and strain, under the three different loads the maximum stress are 40.276 MPa, 178.79 MPa, 167.52 MPa, they are all less than 300 MPa, and contrast analysis of the flow field before and after the optimization of the change of stress and strain, the maximum stress under fluid structure interaction is 332.01 MPa. Finally, analysied the natural frequency of the compressor and the mode shapes of three different loads.After this analysis, we can understand the compressor flow field under different conditions, verify the structural strength of the blade reliability and resonance point in a particular speed, provides valuable numerical parameters.