The Overal Performance Simulation Research On The Intercooled-cycle Gas Turbine

High-power marine gas turbine is the mainstream for the research anddevelopment of future marine power, and however, the development ofintercooled-cycle gas turbine technology in China is late and there has not been acomplete theory yet. Compared with intercooled and recuperated cycle gas turbine,although the efficiency of intercooled-cycle gas turbine is lower than ICR cycle gasturbine, the output power of IC cycle gas turbine is larger than that of ICR cycle gasturbine due to the lack of the resistance loss of recuperator, and the whole system ismuch less complicated than ICR cycle gas turbine. Thus it is easier to achieve that goalfor China in the low level of the study of marine gas turbine adopting IC-cycle gasturbine and it is necessary to carry out the simulation research on the high-powermarine intercooled-cycle gas turbine performance.Firstly, the complete non-linear mathematical model and simulation model basedon MATLAB/Simulink software platform of intercooled-cycle gas turbine have beenbuilt according to the mechanism of thermodynamic system modeling method, takingthe impacts into consideration such as rotational inertia, volume inertia, intercooler’ sthermal inertia. By analyzing the exist problems of the modeling and simulation of theheat exchanger, the mathematical model and simulation model of the on-engineintercooler and off-engine intercooler were built using sub-lumped modeling method.Secondly, the intercooled-cycle gas turbine system module base has been builtbased on MATLAB/Simulink/GUI software platform using object-oriented graphicalinterface modeling method, and it can be simply and effectively assembled into asystem-level dynamic simulation model according to users’actual demand.Anextensible marine intercooled-cycle gas turbine simulation software was developed,including intercooled-cycle gas turine overall performance assessment software,intercooled-cycle gas turbine propulsion system dynamic simulation software andintercooled-cycle gas turbine integrated power system dynamic simulation software.These softwares aim at providing engineering design personnel who are engaged in gasturbine power system design and performance optimization with a software platform for concentrated design and management.Thirdly, intercooled-cycle gas turbine thermodynamic calculation software hasbeen developed based on MATLAB/GUI. User can use this software to calculate theintercooled-cycle gas turbine overall performance parameters and thus analyze theinfluence of different seawater inlet temperature, different on-engine intercooler colddegree, different off-engine intercooler cold degree, different glycol solution coolantmass flow, different atmospheric temperature on the intercooled-cycle gas turbineoperating performance, which is the foundation for design and assessment of this kindof high-power engine. And then the optimization calculation software for singleobjective and multiple objectives was developed. These work can provide technicalsupports for the design, maneuver, and performance optimization.What’s more, the dynamic simulation of the intercooled-cycle gas turbinepropulsion system performance under variable operating conditions and under theswitching of intercooler system working mode has been done firstly.Secondy, theship-engine-propeller matching characteristic analysis of intercooled-cycle gas turbinepropulsion system was carried out. Thirdly, in order to ensure the engine set goodmobility, safety and reliability during acceleration, the best fuel supply rate curve ofthe intercooled-cycle gas turbine was obtained through the simulation study of fuelsupply rate. At last further research on flow parameters optimization for intercooler ofmarine gas turbine propulsion system was carried out.At last, the dynamic simulation of the intercooled-cycle gas turbine integratedpower system performance under variable operating conditions during accelerationsand decelerations has been done. Second, in order to ensure the engine set safety,sub-load plan was proposed during acceleration. Third, In order to ensure the qualityof marine gas turbine generation set, its power turbine spool-speed must maintainconstant. Due to rising or falling power demand, the real and reactive power balance isharmed and hence the power turbine spool-speed gets deviated from nominal value.The combination control of an adaptive fuzzy PID controller together with PIcontroller and high-pressure compressor blow-off control instead of traditional controlsystem is introduced in order to improve the power system quality and safety. At last,further research on flow parameters optimization for intercooler of marine gas turbine intergrated power system was carried out.