Efficiency of complex cycles of gas turbine units with air bleed for the cooling of intermediate combustion chambers

The possibility of effective efficiency increase of a complex cycle gas turbine with intermediate heating is considers provided that effective efficiencies of simple and complex cycles are equal, the degree of gas heating at the second stage is lower than that at the first one and the degree of increase of pressure the simple cycle is optimal in terms of effective efficiency (economic). The economic degree of increase of pressure is determined as the function of the degree of heating at the second stage, as it provides the maximum of work increase in the complex cycle compared with that in the simple cycle. The effective efficiency of the complex cycle with the selection of air for intermediate combustion chamber cooling is found by summing up the effective efficiency of the simple regenerative cycle for the part of air, selected on cooling, and that of the complex cycle with intermediate heating of the other part of the air. It is found that the effective efficiency of the complex cycle with the selection of air for intermediate combustion chamber cooling and its regenerative heating is higher than that without the selection of air and the effective efficiency of the complex cycle as well as the work of this cycle reaches its maximum at economic the degree of increase of pressure in the simple cycle.