Internal Combustion Engine

Methods of Supercharging

Prepared by:-150053119008-Dharmajeet Jadeja150053119009-Bhavesh Katariya

Methods of Supercharging:-

• Compressor driven by engine• Compressor driven by turbine• Compressor driven by external source of

power• Compressor driven by engine shaft and free

turbine• Direct coupling between engine, compressor

and turbine

1)Compressor driven by engine

• In this arrangement, the compressor is driven by engine with help of gearing or belt drive, a certain engine output is used to run the compressor as shown in fig. In this case, net output of supercharged engine is greater than gross output of naturally aspirated engine. The net output increase due to supercharging is obtained by subtracting this power from the gross output. Air cooler is used after compressor to reduce the temperature of air: therefore, further density of air is increased.

2)Compressor driven by turbine

• In this arrangement, the compressor is driven by turbine which run with help of exhaust gases coming from engine as shown in fig. In this case engine output is not utilized to drive to drive the compressor, but the exhaust energy of the engine is used to run the turbine which is coupled to compressor. There is no mechanical connection between engine and supercharger. This arrangement is also called turbo-chargered.

3)Compressor driven by external source of power

• In this arrangement, the compressor is neither driven by engine nor turbine, but compressor is separarately driven by external power source as shown in fig.

4)Compressor driven by shaft and free turbine

• In this arrangement, power produced by engine is utilized only to run the compressor as shown in fig. the exhaust gases coming from engine is utilized to run the turbine. The power produced by turbine is used for external load. This arrangement is also known as generator type supercharging.

5)Direct coupling between engine, compressor and turbine

• In this arrangement, the compressor, engine and turbine all are coupled together with help of gearing as shown in fig. In this case, If the turbine output is not enough to run the compressor during the part load on engine power takes care of the remaining load of compressor. In addition to this an extra power from the turbine can be fed to the engine.

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