双轴燃气轮机启动过程的动态建模与参数影响分析

Dynamic Modeling and Parameter Influence Analysis of the Dual Axis Gas Turbine During the Starting Process

为了对高度非线性的双轴燃气轮机启动过程进行模拟,在稳态模型中加入燃机动态方程,研究了燃气轮机启动过程的气动参数变化规律。首先,结合压气机、燃烧室、燃气涡轮、动力涡轮及空气系统等热力学模块,建立了燃气轮机启动过程的稳态工作模型;考虑低转速的部件特性,给出了燃气发生器和动力涡轮的转子动态方程,并利用改进欧拉法进行高效迭代求解,实现燃气轮机从启动到慢车稳定运行的动态仿真模拟。其次,在大气温度288.15K、大气压力101.325kPa的环境条件,以及给定供油规律和启动机功率特性下,分析了燃气发生器转速、动力涡轮转速、排气温度及燃气发生器转子剩余功率等随时间的变化规律。最后,在仿真模型中输入某型双轴燃气轮机的相关数据,开展仿真模型与试验数据的对比分析研究。研究结果表明,仿真结果和试验数据在整体趋势上符合度较好,即该模型具有较高的仿真精度,可以对工程设计、试验起到很好的指导作用。

In order to simulate the highly nonlinear starting process of the dual axis gas turbine,the dynamic equation of the gas turbine was added to the steady-state model to study the variation law of aerodynamic parameters during the starting process of the gas turbine.Firstly,a steady-state working model of the gas turbine starting process was established by combining thermodynamic modules such as compressor,combustion chamber,gas turbine,power turbine,and air system;Considering the characteristics of low-speed components,the rotor dynamic equations of the gas generator and power turbine were given,and the improved Euler method was used for efficient iterative solution to achieve dynamic simulation of the gas turbine from start-up to stable operation at idle.Secondly,under environmental conditions of atmospheric temperature 288.15K and atmospheric pressure 101.325kPa,as well as given fuel supply patterns and starter power characteristics,the variation rules of gas generator speed,power turbine speed,exhaust temperature,and residual power of gas generator rotor over time were analyzed.Finally,by inputting relevant data of a certain type of dual axisgas turbine into the above simulation model,a comparative analysis and research is conducted between the simulation model and experimental data.The research results indicate that the simulation results and experimental data are in good agreement with the overall trend,indicating that the model has high simulation accuracy and can provide good guidance for engineering design and testing.