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鉴于离心式压缩机运行性能在线诊断中预期性能的计算极为重要，而对于运行中工作元件发生变化（如叶轮密封的磨损、通流各元件的结垢等）引起性能的变化尚无较好的计算方法，特别是在许多情形下压缩机的结构参数不全时更难于计算，提出将对压缩机段的热力计算简化成为一个中间平均级的计算方法；因模型简化而带来的误差引入了相应的修正系数，其值利用压缩机的性能曲线在整个性能曲线场范围内校核确定，从而推导出准确的性能参数计算式．计算示例表明，它不仅能很好地应用于压缩机运行预期性能的计算，而且能较好地应用于压缩机工作元件变化对性能影响的分析．
In view of the extremely important calculation of expected performance in on-line diagnostics of centrifugal compressor performance, there is not a good change in performance due to changes in working components during operation (such as impeller seal wear, scaling of through-flow components, etc.) The calculation method, especially in many cases, is more difficult to calculate when the structural parameters of the compressor are incomplete. It is proposed to simplify the calculation of the thermal calculation of the compressor section to an intermediate averaging stage. The error caused by the simplification of the model introduces the corresponding Of the correction factor, the value of the compressor performance curve using the entire performance curve field check to determine the accuracy of the performance parameters to derive the formula. The calculation example shows that it can not only be applied to the calculation of the expected performance of compressor operation, but also can be applied to the analysis of the influence of the change of working element of compressor on performance.