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A new approach to generate turbine map data in the sub-idle operation regime of gas turbines

机译：一种新方法，可以在燃气轮机子空间运行制度中生成涡轮机地图数据

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Gas turbines are likely to face critical situations such as compressor surge and stall in the sub-idle operation region. Thus, it is important to predict the operation characteristics of gas turbines accurately by using simulations in the sub-idle region. However, sufficient information about the component performance maps in the sub-idle region is generally not available, and extrapolation methods are usually used to generate data. However, extrapolation methods tend to generate physically invalid data points in very low-speed regimes, which sometimes cause critical numerical problems in simulations of engine performance. This study proposes a new method to generate performance data in the sub-idle region of turbine performance maps through interpolation. A zero point is introduced where the pressure ratio is one and the mass flow rate is zero. Performance data were generated between the existing performance curve and the zero point using the interpolation. To validate the proposed method, it was applied to publicly available turbine performance maps. It was confirmed that the proposed method improves the numerical matching between the compressor and turbine maps and thus expands the predictable operating regime by as much as 23.3% compared to a conventional extrapolation method. (C) 2019 Elsevier Ltd. All rights reserved.
机译：燃气轮机可能面临诸如子空间操作区域中的压缩机浪涌和失速的临界情况。因此，重要的是在子空闲区域中使用模拟预测燃气轮机的操作特性。然而，关于子空闲区域中的组件性能映射的足够的信息通常不可用，并且通常用于生成数据来生成数据。然而，外推方法倾向于在非常低速的方案中产生物理上无效的数据点，这有时会导致发动机性能模拟中的关键数值问题。本研究提出了一种新方法，通过插值地生成涡轮机性能映射的子空闲区域中的性能数据。引入零点，其中压力比为一个并且质量流量为零。使用插值之间的现有性能曲线和零点之间生成性能数据。为了验证所提出的方法，它应用于公开的涡轮机性能图。已经证实，与传统外推方法相比，所提出的方法改善了压缩机和涡轮机贴图之间的数值匹配，从而使可预测的操作方案扩展多达23.3％。 （c）2019 Elsevier Ltd.保留所有权利。

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