Basic Concept
In general gas turbine is look like above picture. The starter motor rotates shaft in the begining. When a compressor rotates it intakes air from outside to the compressor. The input air is heated and burned and get power to rotate the outpout blades which is connected to shaft. Shaft rotates generator and generates mechanical power. This is the easiest and simplest way to describe how SGT-600 turbine works.
As it can be seen, through inlet , air come to the compressor and start to compress in compressor. Air colume and air pressure, decrease and increse respectively. In this time air pressure is ready to explode in cumbusion chamber. In cumbustion chamber, compressed air and fuel start to explode by means of sparkle. In this stage, heated air rotate the blade of compressor turbine (CT) and generate the enough power to rotate the compressor shaft (only in start-up the compressor shaft uses external power for rotating from starter motor). So, part of power decreases in this part. Remaining power rorates the power turbine(PT) blades and power turbine shaft starts to rotate. At the end of power turbine shaft everything that need to rotate can be connected. Both pictures describe this action.