With sketch, justify use of Variable Geometry Turbocharger as compared to fixed geometry turbocharger.

With sketch, justify use of Variable Geometry Turbocharger as compared to fixed geometry turbocharger. 
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1 Answer

Answer :

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Variable Turbine Geometry technology is the next generation in turbocharger technology where the turbo uses variable vanes to control exhaust flow against the turbine blades. The problem with the fixed geometry turbocharger that big turbochargers do not work well at slow engine speeds, while small turbochargers are fast to spool but run out of steam pretty quick. A turbocharger equipped with Variable Turbine Geometry has little movable vanes which can direct exhaust flow onto the turbine blades. The vane angles are adjusted via an actuator. The angles of the vanes vary throughout the engine RPM range to optimize turbine behaviour.

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