This paper describes the application of low-order models to the prediction of the steady performance of axial compressors at sub-idle conditions. An Euler body-force method employing sub-idle performance correlations is developed and presented alongside a mean-line approach employing the same set of correlations. The low-order tools are used to generate the characteristic lines of the compressor in the locked-rotor and zero-torque windmilling conditions. The results are compared against steady-state operating points from three-dimensional (3D) Reynolds-averaged Navier–Stokes (RANS) computational fluid dynamics (CFD) simulations. The accuracy of the low-order tools in reproducing the results from high-fidelity CFD is analysed, and the trade-off with the computational cost of each method is discussed. The low-order tools presented are shown to offer a fast alternative to traditional CFD which can be used to predict the performance in sub-idle conditions of a new compressor design during early development stages.

中文翻译：

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产生轴流压气机亚怠速特性的体力和平均线模型

本文介绍了低阶模型在亚怠速条件下轴流压气机稳定性能预测中的应用。开发了一种采用亚怠速性能相关性的欧拉体力方法，并与采用同一组相关性的平均线方法一起提出。低阶工具用于生成压缩机在堵转和零转矩风车条件下的特征线。将结果与来自三维 (3D) 雷诺平均纳维-斯托克斯 (RANS) 计算流体动力学 (CFD) 模拟的稳态工作点进行比较。分析了低阶工具从高保真 CFD 再现结果的准确性，并讨论了每种方法与计算成本的权衡。