一种输气管道燃气轮机性能计算方法及其验证

准确掌握燃气轮机的气路性能参数,对输气管道燃驱压缩机组的运行维护具有重要意义。建立了一种基于一维Newton迭代的燃气轮机气路性能计算方法,并通过引入“虚拟部件”的概念对具有复杂气路结构的燃气轮机进行模型简化,使建立的计算方法具有更广泛的适用性。在此基础上,分别根据燃气发生器中“虚拟部件”和实际部件的平衡机理,给出了热端部件进、出口截面处的气路物性参数计算方法,以进一步获取燃气轮机中热端部件的各项性能参数求解。将建立的性能计算方法用于GE LM2500 +型和RR RB211-6562型燃气轮机的燃气发生器各部件性能求解,通过与基于多维迭代计算方法获得的部件性能参数进行对比及理论分析,验证了新方法的准确性。新方法克服了由于热端部件气路物性参数缺失而造成的热端部件性能参数无法求解的问题,为输气管道燃气轮机的性能的计算提供了新的思路。

A performance calculation method for gas turbines used in gas pipelines and its validation

It is of great significance to grasp the gas-path performance parameters of gas turbine accurately for the operation maintenance of gas turbine-driven compressor sets in gas pipelines. In this paper, a performance calculation method based on one dimension Newton iteration technique used for the gas path of gas turbine was established. Besides, the model of the gas turbine with complex gas-path structure was simplified by introducing the concept of "virtual component", so that the performance calculation method can be applied more extensively. Then, the method for calculating the gas-path thermophysical parameters at the inlet/outlet section of each hot-end component was developed according to the equilibrium mechanism of "virtual component" and actual component in the gas generator respectively, so as to obtain the performance parameters of each hot-end component of gas turbine further. Finally, this newly proposed performance calculation method was applied to calculate the performance of each component in the gas generators of GE LM2500+ and RR RB211-6562 gas turbine, and its accuracy was verified by comparing with the performance parameters solved by multi-dimension iteration based calculation method and carrying out theoretical analysis. In conclusion, this new method can deal with the problem that the performance parameters of hot-end components cannot be solved due to the lack of gas-path thermophysical parameters of hot-end components. The research results provide a new idea for the performance calculation of gas turbines in gas pipelines.