Performance analysis of a reheat cycle gas turbine based on measured data

초록

This study evaluated component characteristics of the reheat cycle gas turbine in a combined cycle power plant. High pressure ratio, sequential combustion, large amount of cooling flow and full utilization of the inlet guide vane distinguishes the engine from simple cycle engines. Considering the detailed engine configuration, performance analysis using an inverse calculation, based on measured performance data, has been carried out to estimate the component characteristic parameters that closely match the measured performance parameters. The measured parameters are power, fuel flow rates of two combustors, and temperatures and pressures at compressor discharge, exits of both high and low pressure turbines. The estimated parameters from the analysis include not only the compressor and turbine efficiencies but also the inlet air flow rate. The analysis has been performed for a wide operation range in terms of ambient temperature and load. Not only the absolute value of the inlet air flow rate but also its variation with the operating condition change correspond very well with the reference data from the manufacturer. The compressor and turbine efficiencies at each full load condition and their variations with the operating condition change were examined. The sensitivity of the estimated parameters to the uncertainties of the measured parameters has also been investigated. Copyright ？ 2007 by ASME.