Published Paper Details:

Mixed flow compressor module is employed in machines such as gas turbine engines, steam turbines marine applications and power generation purpose. Mixed flow compressor impeller is cad modeled and analyzed for thermo-mechanical stress for improvement in the structural ability for load carrying capacity. In this work mixed flow compressor impeller is cad designed based on the centrifugal compressor design methodology for given operating conditions. The geometric modeling of the impeller was done using the modeling tool catia and it was imported to Hyper mesh for meshing then exported to ANSYS through input file in ‘in’ file format for the subsequent analysis. The impeller was analyzed for different loads such as inertial and thermal loads and cyclic symmetric boundary conditions. The impeller shaft analyzed for natural frequency and mode shapes to avoid resonance conditions. Thermal barrier coating materials are used to reduce the heat transfer to the system and its structural ability is estimated. A layer of composite thermal barrier coating is created using hyper mesh and the effect of this on stress behavior is analyzed. The results shows reduction of deflection and stress with low thermal expansion coefficient material. Even composite material has lesser thermal conductivity along with density compared to the parent titanium material. This character of composites can be effectively utilized to increase the load carrying capacity of the impeller. The impellers can operate still at higher frequencies with this composite cladding. Modal analysis is carried out to find the resonant frequencies. The results show the first natural frequency of 1332 Hz is much higher compared to the operational frequency of 783Hz. So resonance will not takes place in the problem.