The processes involved in ideal brayton cycle are not practically possible because of the internal irreversibility and complexity of the system. There will be some pressure drop in pipes of heat exchangers, so heat addition and heat rejection can not be possible at constant pressure and work done by turbine and compressor work are not isentropic as well. Here we will see the later case, losses due to pressure drop are considerably small so we will neglect them. The lesson describes the isentropic efficiency of compressor and turbine and how does the efficiency of actual brayton cycle less than ideal braytoin cycle. It also explains the work ratio and back work ratio.
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