Low-pressure Compressor Working Line and Influencing Factors Analysis of Intercooled Cycle Gas Turbine
In order to gain a detailed understanding of the working characteristics of the intercooled cycle(IC)gas turbine and the changes in low-pressure compressor(LPC)working line during actual operation,the LPC working line equation of the IC gas turbine was theoretically derived,considering the influence of air system bleed and compressor outlet leakage on flow continuity,the flow ratio coefficient between compressor and turbine and adjacent turbines.From the equation,typical influencing factors of the LPC working line were obtained.Unlike the analysis of high-pressure compressor(HPC)working line changes using equivalent HPC converted speed condition,the analysis of LPC working line changes using equivalent high-pressure rotor pressure ratio was more reasonable.Based on this method,the variation mechanism of LPC working line equation of the IC gas turbine under typical influencing factors was analyzed.Based on the changes in typical influencing factors after long-term operation of the IC gas turbine,theoretical calculations and mechanism analysis were conducted on the specific changes in the LPC working line.The decrease in the efficiency of HPC and high-pressure turbine(HPT),the increase of HPT guide area,the decrease in the performance of intercooler,and the increase in secondary water temperature can lead to position rising in the LPC working line.The decrease in the efficiency of LPC and low-pressure turbine(LPT),the increase of LPT guide area,the increase of LPT outlet leakage rate,and the increase in atmospheric temperature can lead to position sinking in the low-pressure working line.
intercooled cycle gas turbinelow-pressure compressor working lineinfluence factorhigh-pressure rotor pressure ratioatmospheric temperaturesecondary water temperature
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