基于特征通流面积的汽轮机变工况性能分析

摘要

阐述了基于留格尔公式提出的特征通流面积概念的定义及计算方法,在IAPWS - IF97公式基础上,利用Visual Basic 6.0平台初步开发了汽轮机组通流部分特征通流面积计算软件,并以国产600MW超临界机组为研究对象,对机组变工况下级组的特征通流面积进行了计算和分析.研究结果表明:汽轮机级组的特征通流面积在通流部分尺寸不发生变化时,其值保持不变,并且变工况下其计算精度能满足工程要求,可以作为机组通流能力及通流部分故障诊断的准则参数,为机组通流部分的状态监测与故障的精确诊断提供依据.%The definition and calculation method of characteristic flow area (CFA) which based on FlUgel Formula are presented in this paper. On the basis of the IAPWS - IF97 formula, calculation software of CFA for steam turbine flow passage was developed on Visual Basic 6. 0 software platform, and the CFAs of the domestic 600MW supercritical units under off-design conditions were calculated and analyzed. The results show that the calculation accuracy of CFA under off-design conditions is high and fits the project requirements. It is feasible to apply in calculation of variable CFA, monitoring and diagnosis of steam turbine, and to apply in the field of improved design of the flow passage, variable characteristic flow area calculation,monitoring and diagnosis of steam turbine flow passage.