船用三轴燃气轮机性能退化指标体系的构建

从燃气轮机整体性能、气路部件、滑油系统、结构振动等方面,较为全面地构建了船用三轴燃气轮机性能退化指标体系。提出了表征整机性能退化的排温裕度、热损失指标、功率不足指标、额外热功比、热效率比等指标。明确了表征气路部件退化的退化因子的概念,提出了绝热效率退化因子、流量退化因子、喘振裕度、热电偶分散度等表征压气机、涡轮、燃烧室等气路部件退化的指标。提出了构建数学模型、统计三限值法、小偏差法和卡尔曼滤波等退化指标的求解和分析方法,并进行了实例分析。为进一步开展燃气轮机性能退化状态评估构建了基本框架。

Construction of Performance Degradation Indices System of Three-Shaft Marine Gas Turbine

The indices system of marine three-shaft gas turbine performance degradation is built,from the aspect of the overall engine performance, gas path components, the lubricating oil system, vibration,etc. The exhaust gas temperature margin, heat loss index, power deficit index , the extra heat ratio and thermal efficiency ratio are put forward , which are the characterization of overall engine performance degradation. The concept of degradation factor,characterizing the degradation of gas path components, is expounded. The degradation indexes of gas path components such as compressor, turbine and combustion chamber are put forward, including the adiabatic efficiency degradation factor, the flow capacity degradation factor, the surge margin,the thermocouple dispersion and so on. The solving and analysis methods of degradation indices are proposed , such as building mathematical model , statistical threshold method,small deviation method and Kalman Filter method,which are carried on the instance analysis. The paper constructs the basic framework for further research of gas turbine performance degradation.