Conjugate Modelling of a Closed Co-Rotating Compressor Cavity
Conjugate Modelling of a Closed Co-Rotating Compressor Cavity
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DOI：
10.1115/gt2023-102900
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发表时间：
2023-06
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影响因子：
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通讯作者：
James Parry;Hui Tang;James A. Scobie;G. Lock;Mauro Carnevale
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作者：
James Parry;Hui Tang;James A. Scobie;G. Lock;Mauro Carnevale
预测传热的稳健方法对于精确控制压缩机中的叶尖间隙以及这些叶片所附的圆盘的径向生长至关重要。从根本上说，同向旋转圆盘之间的空腔中的流动是一个共轭问题：穿过该空腔的温度梯度驱动核心中与圆盘异步旋转的大型浮力结构，从而控制圆盘中的传热和温度分布。实际的发动机设计者需要方便的计算方法和低阶建模。这里介绍了一种可用作预测工具的共轭传热方法。大多数旋转腔模拟仅考虑孤立的流体域，并且通常需要已知的盘温度分布作为解决方案的边界条件。本文提出了一种针对共轭问题的新颖耦合策略，其中流体的非稳态雷诺平均纳维斯托克斯 (URANS) 模拟与固体域的一系列稳定模拟以迭代方式相结合。该策略克服了由于流体和固体之间的热惯性差异造成的限制；该方法保留了非定常流动特征，但允许预测圆盘温度分布，而不是使用它们作为边界条件。该方法已在封闭同向旋转腔的基本流动配置上得到验证。将模拟预测的金属温度和传热相关性与一系列发动机相关条件下实验测量的金属温度和传热相关性进行比较。
Robust methods to predict heat transfer are vital to accurately control the blade-tip clearance in compressors and the radial growth of the discs to which these blades are attached. Fundamentally, the flow in the cavity between the co-rotating discs is a conjugate problem: the temperature gradient across this cavity drives large-scale buoyant structures in the core that rotate asynchronously to the discs, which in turn governs the heat transfer and temperature distributions in the discs. The practical engine designer requires expedient computational methods and low-order modelling. A conjugate heat transfer methodology that can be used as a predictive tool is introduced here. Most simulations for rotating cavities only consider the fluid domain in isolation and typically require known disc temperature distributions as the boundary condition for the solution. This paper presents a novel coupling strategy for the conjugate problem, where unsteady Reynolds Averaged Navier-Stokes (URANS) simulations for the fluid are combined with a series of steady simulations for the solid domain in an iterative approach. This strategy overcomes the limitations due to the difference in thermal inertia between fluid and solid; the method retains the unsteady flow features but allows a prediction of the disc temperature distributions, rather than using them as a boundary condition. This approach has been validated on the fundamental flow configuration of a closed co-rotating cavity. Metal temperatures and heat transfer correlations predicted by the simulation are compared to those measured experimentally for a range of engine-relevant conditions.