Week-6 : Turbocharger Modelling

• List down different TC and locate examples from GT Power

1. Different turbochargers

• Single-Turbo.
• Twin-Turbo.
• Twin-Scroll Turbo.
• Variable Geometry Turbo.
• Variable Twin Scroll Turbo.
• Electric Turbo.

Different turbine available in GT Power

• Explore tutorial number 6 and 7 , Plot operating points on compressor and turbine maps

compressor efficiency monito with operating points.

Turbine speed map

Turbine efficiency map

Compressor speed map

Compressor efficiency map

• In which application Variable Geometry Turbine is beneficial?

The variable geometry turbine allows significant flexibility over the pressure ratio across the turbine. In diesel engines, this flexibility can be used for improving low speed torque characteristics, reducing turbocharger lag and driving EGR flow. 

other benefits of VGT are,

• ability to provide engine braking;
• ability to raise exhaust temperature for aftertreatment system management.
• no throttling loss of the wastegate valve;
• higher air–fuel ratio and higher peak torque at low engine speeds;
• improved vehicle accelerations without the need to resort to turbines with high pumping loss at high engine speeds;
• a better ability to cover a wider region of low BSFC in the engine speed–load domain

• Explore example- Diesel VGT EGR and understand the modeling part

This VGT EGR model is consist of 4 cyl diesel engine. equiped with turbocharger and HP EGR system.

EGR system hepls to reduce combustion temperature. there by exhaust gas temperature is reduced this also reduces the NOx formation inside th cylinder.