| High-power gas turbine are one of the future development directions of ship power.The use of intercooling cycles can reduce the power consumption of high-pressure compressor and increase the output power.Compared with the simple cycle,the intercooling cycle adds Inter Cooler.The existence of the intercooler will affect the matching relationship between the high and low pressure compressors and make the dynamic process of the gas turbine with a large thermal inertia.Therefore,in order to make full use of the advantages of the large output power of the intercooled gas turbine and the low fuel consumption in off-design conditions,it is necessary to study its performance matching and control strategy.Based on the idea of integrated simulation,this paper builds an integrated simulation platform for gas turbine,matches and optimizes the performance of gas turbines and intercooling systems under variable operating conditions,and studies the dynamic processes and control strategies of intercooled gas turbine in different operating modes.The main research contents of this article are as follows:1.The heat transfer calculation model of the plate-fin heat exchanger was established by the ?-NTU method,and the empirical formula was modified based on the test data.The efficiency of the internal heat exchanger and the calculation accuracy of the gas-side temperature have been significantly improved.Based on the modified heat transfer calculation model and the energy conservation equation,a dynamic model of the heat exchanger is established.The distributed parameter method is used to segment the heat exchanger.The results show that the model can accurately simulate the thermal inertia of the heat exchanger during dynamic process.2.The integrated simulation method is used to build a gas turbine simulation model in the Matlab/Simulink platform based on the mathematical model of each component of the gas turbine.Based on the specific intercooling system and fuel system structure,the simulation of the intercooling system and fuel system is built in the AMESim.The model and the integrated simulation model of the intercooled gas turbine are established through the data interface to realize the multi-disciplinary coupled simulation of the component-subsystem level of the intercooled gas turbine.3.Aiming at the problem of component mismatch caused by the introduction of the intercooler,the effects of the total pressure ratio,the pressure ratio distribution,and the intercooling effectiveness on the performance of the intercooled gas turbine are analyzed from the thermal cycle parameters,and the design point parameters perform optimization,and analysis on the matching and optimization of the gas turbine and the intercooling system,and select the water mass flow and seawater mass flow as the optimization variables to obtain the optimal flow regulation zone of the intercooling system.Finally,study the variable operating performance of the intercooling engine The effects of environmental conditions,load characteristics and intercooling on the performance of gas turbines were analyzed.4.Considering the thermal inertia brought by the intercooler and the intercooling system,the dynamic response of the intercooler system under different adjustment methods is simulated and researched.The control strategy for the intercooler system during normal operation and sudden shutdown is formulated to avoid burning the overheating or surge phenomenon occurs due to the intercooler system;then the influence of the load change on the overall performance and compressor operating line in the intercooled gas turbine power generation mode is analyzed.Two control strategies have been developed,which are to keep the air-side outlet temperature of the intercooler constant or change with operating conditions.Finally,the dynamic process of the intercooled gas turbine propulsion model is simulated,the co-control curve of the propeller and the influence of the acceleration rate on the performance of the propeller are shown.It can prevent the plant from over-temperature or over-torque. |
