Owing to the increase of moisture content in working medium entering the gasturbine of the humid air turbine （HAT） cycle

the performance of said turbine may be greatly varied. A performance model on basic element level has been established by using analytical method of one dimentional flow

and calculation models for entire performance and for critical conditions being established on the said basic element level basis. After completing the establishment of entire model

comparison and analysis of the performance under given geometric dimentions and initial conditions

as well as under situation of unchanging backpressure and differently increasing humidity

have been carried out.