Research On Modeling And Simulation Technology Of Reversible Gas Turbine

Ship maneuverability is a main indicator to measure the performance of the ship’s power system,and the reversing performance of the ship will greatly affect the ship’s maneuverability.In order to solve the reversing problem of gas turbine power system,the concept of reversing gas turbine came into being.Compared with other traditional reversing methods such as controllable pitch propellers and reversing gearboxes,reversing gas turbines can realize reversing switching operations faster and can improve the maneuverability of ships.Therefore,reversing gas turbines have good application prospects in ship propulsion.On the basis of the original gas turbine,the reversing gas turbine has a complex structure and unclear operation rules due to the addition of the reversing actuator and the dual-flow turbine structure,which makes it difficult to study the control strategy of the reversing gas turbine.Therefore,based on the integrated simulation method,this paper establishes an integrated simulation model of the reversing gas turbine,and studies the forward/reversing switching process of the reversing gas turbine and the control strategy under different operating conditions.The research contents include:1.Based on the research on the structural principles of different reversing actuators,design and model the reversing actuators.The kinematics simulation model of the mechanical system of the reversing actuator is built in Adams software,and the simulation model of the hydraulic system of the reversing actuator is built in the AMEsim software.The hydraulic system simulation model is experimentally verified through the experimental equipment of the reversing actuator simulation device of the reversible gas turbine.2.Based on the mathematical model of each component of the gas turbine,establish a modular simulation model of the gas turbine in Matlab/Simulink,realize the data interaction and operation synchronization between Matlab/Simulink,Adams and AMEsim through the integrated simulation interface technology,and establish a reversing gas turbine integration simulation platform.3.The performance of the reversing gas turbine under different operating modes is studied,and the influence of environmental changes and load characteristics on the performance of the reversing gas turbine is analyzed.Steady-state results show that the rated power in reverse mode is only 51.6% of that in forward mode,while the resulting blower loss is 195.5% of that in forward mode.From the performance analysis of variable working conditions,it can be concluded that no matter in which operating mode,the increase of atmospheric temperature and atmospheric pressure will lead to the decrease of the operating efficiency of the gas turbine while keeping the output shaft speed unchanged.4.Based on the integrated simulation platform of the reversing gas turbine,according to the switching time of the reversing actuator,the forward/reverse switching characteristics of the reversing gas turbine are analyzed,and the optimal switching time of the actuator is selected to avoid the gas turbine overtorque and improve the operating performance of gas turbine.The operation control strategy of the reversing gas turbine is formulated for the normal operation and emergency stop of the ship.Under the normal operation control strategy,it takes 229.6 s for the ship to switch from full-speed forward to full-speed reverse,and the ship continues to sail forward for 6.5 ship lengths during the entire maneuvering process.