Numerical Simulation of Two-Stage Variable Geometry Turbine

The modern internal combustion engine (ICE) has to meet several requirements. It be reliable with the reduced emission of pollutant gasses and low maintenance What is more, it efficient both at low-load high-load operating conditions. For this purpose, a variable turbine geometry (VTG) turbocharger used provide proper acceleration exhaust gases Such solution also In paper, result an unsteady, three-dimensional (3D) simulation two-stage system discussed. Three different VTG positions were considered for those simulations, along three speeds. inlet was modeled as six equally placed pipes each cylinder eliminate interference pressure waves. flow field outlet 1st stage nozzle vane 2nd rotor investigated. simulations showed that technologies significantly improve efficiency system. highest overall achieved 60,000 rpm 11° position.