1. The variable area turbine technology
variable area turbine technology vortex core section is adjustable guide vanes, which guide vanes may be closed at low speed conditions, the low displacement , thereby increasing the intake pressure of the engine.
Before details of variable geometry turbine technology, let’s revisit the turbo technology:
Turbo Technologies is a common technology engine, its principle is very simple: the exhaust gas turbocharger is equivalent to a discharged by an engine driven air pump. Throughout the course of the combustion engine, there will be about 1/3 of the energy into the cooling system, energy 1/3 is used to drive the crankshaft to work, and with the last third of the gas discharged. Take an example power 200 kW engine, according to the proportion mentioned above, it is the power consumed in the exhaust gas will be about 70 kilowatts. It has a large part of the power with the high temperature exhaust gas dissipated as heat in the form of kinetic energy and the exhaust gas itself may be only a dozen kilowatts. But do not underestimate this ten kilowatts to know about home stand fan power of 60 watts, but! That is, even more than ten kilowatts is enough to drive more than two sets of fans! One can imagine, with the exhaust turbine drive air supercharging effect caused by very impressive.
Although the engine under full load the exhaust gas energy is very impressive, but when the engine speed is low, the exhaust energy is small, poor, this time due to lack of the turbocharger will not reach the driving force operating speed, the result of this is due, at low speed, the turbocharger does not play a role, this time the dynamic performance turbocharged engine even less than a naturally aspirated engine of the same displacement, this is what we often He said “turbo lag