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.