中文摘要：

提出了一种核函数非线性偏最小二乘（PLS）与机理模型相结合的多级离心压缩机性能预测混合建模方法，用以预测离心压缩机的输出压比。通过分析大型离心压缩机多级压缩过程的机理，利用能量守恒关系，在压缩机各级气流损失计算和等熵效率定义的基础上建立了多级离心压缩机性能预测机理模型；利用核函数非线性PLS对机理模型的误差进行了修正。实验结果验证了该方法相比于机理模型的有效性，将其应用于实际生产过程中，取得了满意的效果。

英文摘要：

A hybrid modeling method is proposed to predict the pressure ratio of multi-stage centrifugal compressor, which combines kernel nonlinear partial least squares （PLS） and principle model. Through analyzing the mechanism of multi-stage compression process, calculating airflow loss and defining isentropic efficiency, a principle model for performance prediction of multi-stage centrifugal compressor is established, and kernel nonlinear PLS is also used to correct the error of the principle model. Experiment analysis verifies the validity that the effectiveness of the method is better than that of ordinary principle model. The proposed method was applied to practical industrial process and result demonstrates that the method achieves satisfactory estimation performance.