Frictional Contact Analysis of Turbocharger Compressor-Shaft Sleeve-Shaft

The impeller mounted onto the compressor shaft assembly via interference fit is one of the key components of a centrifugal compressor stage. The assembly creates a complicated frictional contact problem the interface of the mating parts when the rotational speed is high. So it is quite necessary to investigate the contact situation of compressor-shaft sleeve-shaft for running safely. The FE parametric quadratic programming (PQP) method developed based on the parametric variational principle (PVP) is used for the analysis of stress distribution of 3D frictional contact of impeller-shaft sleeve-shaft. The effects of coefficient of friction, the wall thickness of shaft sleeve, rotational speed and the contact stress distribution on the mating surfaces are discussed in the numerical computation. The numerical results can be referred to in deciding the proper fit tolerance and improving the design and manufacturing technology of compressor impellers.