Coupled Aerothermal Modeling of a Rotating Cavity With Radial Inflow

Coupled Aerothermal Modeling of a Rotating Cavity With Radial Inflow
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径向流入旋转腔的气动热耦合模拟

DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
N. J. Hills
N. J. Hills
中科院分区：
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文献类型：
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作者：
Zixiang Sun;D. Amirante;J. Chew;N. J. Hills

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采用计算流体力学(CFD)、大涡模拟(LES)和流固耦合模型，对径向进气的航空发动机压气机盘腔内的流动和换热进行了研究。使用一组常用的湍流模型以及0.2°轴对称和22.5°离散扇形CFD模型进行了独立的CFD研究。CFD预测之间的总体一致性很好，并且在空腔的主要部分，解与已建立的积分方法解相当。大涡模拟结果表明，径向入流在很大程度上抑制了由不稳定热层结引起的空腔内流动不稳定。采用轴对称扇形模型和Spalart-Allmaras湍流模型对旋转腔进行定常流动CFD模拟，并与旋转腔的有限元热模型进行耦合。在金属温度方面，耦合解与台架试验数据吻合较好。分析证实，在压缩机腔体中使用小的径向排气流可以有效地减少压缩机盘片的热响应时间，这可以应用于压缩机叶片间隙的管理。版权所有©2015年，由劳斯莱斯公司
Flow and heat transfer in an aero-engine compressor disc cavity with radial inflow has been studied using computational fluid dynamics (CFD), large eddy simulation (LES) and coupled fluid/solid modelling. Standalone CFD investigations were conducted using a set of popular turbulence models along with 0.2° axisymmetric and a 22.5° discrete sector CFD models. The overall agreement between the CFD predictions is good, and solutions are comparable to an established integral method solution in the major part of the cavity. The LES simulation demonstrates that flow unsteadiness in the cavity due to the unstable thermal stratification is largely suppressed by the radial inflow. Steady flow CFD modelling using the axisymmetric sector model and the Spalart-Allmaras turbulence model was coupled with a finite element (FE) thermal model of the rotating cavity. Good agreement was obtained between the coupled solution and rig test data in terms of metal temperature. Analysis confirms that use of a small radial bleed flow in compressor cavities is effective in reducing thermal response times for the compressor discs and that this could be applied in management of compressor blade clearance.Copyright © 2015 by Rolls-Royce plc