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How does a Variable Geometry Turbocharger(VGT) works?

Published On : 2009-03-12 16:26:49.0 Vinuraj
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A turbocharger consists of a turbine and a compressor mounted on a single shaft. The turbine disc consists of vanes to guide the exhaust gases on to the turbine blades which in turn rotates the shaft and the compressor. At high engine rpm the turbine rotates at 90000 rmp plus speeds resulting in extra compression and chocking the engine. To avoid chocking of engine a mechanism called bleed valve is provided to bleed extra exhaust. Whereas at low engine rpm the compressor is not able to provide enough compression (called turbo lag). To overcome this the Variable Geometry Turbo consists of movable turbine guide vanes, one end of guide vane is pivoted and other end made movable to increase or decrease amount of flow to the turbine blades. At lower engine rpm the guide vanes are wide open to allow maximum flow hitting the turbine blades at an optimum angle to rotate it faster (this avoids turbo lag). At higher engine rmp the guide vanes are closed to reduce the inflow on turbine blades avoiding high speed rotation of turbine. This altogether omits the requirement of bleed valve at high engine rpm.
T on 2011-03-25 15:34:11.0
Variable Geometry Turbocharger acts like a twin turbo on on the engine and boosts the power ratings and efficiency figures.
By Arun on 2011-03-21 16:47:32.0
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