Turbocharger and its intercooler and impeller

- Nov 01, 2017 -

The turbocharger is actually an air compressor that increases the intake by compressing the air. It is the use of the engine exhaust gas inertia momentum to promote the turbine indoor turbine, turbine and drive the coaxial impeller, impeller pressure sent by the air filter pipe sent to the air, so that pressurized into the cylinder. When the engine speed increases, the exhaust gas discharge speed and the turbine speed also increases synchronously, the impeller compresses more air into the cylinder, the air pressure and the density increase can burn more fuel, correspondingly increases the fuel quantity and adjusts the engine speed, may increase the engine output power.


Temperature increases, which not only affect the efficiency of inflation, but also easy to produce deflagration. So the device that lowers the inlet temperature is the intercooler. It is installed between the turbocharger outlet and the intake manifold, cooling the air entering the cylinder. The intercooler is like a radiator, cooled by wind or water, and the heat of the air is dissipated into the atmosphere by cooling. It is tested that the intermediate cooler with good performance not only can keep the engine compression ratio to a certain value without deflagration, but also can increase the inlet pressure and improve the effective power of the engine.


Because of the wide speed range of petrol engine and the change of air flow, the compressor impeller shape of turbo-supercharger is complex in three Yuan Dynasty ultra-thin-thin-walled impeller, usually with 12~30 blade, radiating line-like curve arrangement, blade thickness below 0.5 mm, using special casting method of aluminum material. The shape of the blade directly affects the performance of the turbocharged engine. The more reasonable the shape angle of the impeller, the lighter the quality, the more sensitive the impeller starts, the less the "reaction lag" of the turbocharger's innate defects.

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