Modeling of Film Cooling: Part II — Model for Use in 3D CFD
Modeling of Film Cooling: Part II — Model for Use in 3D CFD
复制标题
气膜冷却建模：第二部分 — 用于 3D CFD 的模型
DOI：
10.1115/gt2005-68780
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Martin George Rose
中科院分区：
文献类型：
--
作者：
A. Burdet;R. Abhari;Martin George Rose
近年来，计算流体力学(CFD)被应用于气膜冷却的气动热力学模拟。单个冷却孔的直接计算需要大量的计算资源。对于实际发动机的冷却系统的优化，由于需要大量的网格节点来覆盖所有喷油孔和真空室，因此参数研究过于耗时。为此，提出了一种基于实验数据调整的近气膜冷却孔流动模型的混合方法，同时直接计算叶片到叶片通道内的流场。为了降低中央处理器(CPU)的成本，减少模拟周转时间，建立了一种新的喷油气膜冷却模型，该模型可以嵌入CFD程序。其目标是能够模拟气膜冷却涡轮叶片，而不必显式地将孔与真空室啮合。本文第一部分介绍的ETHZ稳态气膜冷却平板实验[5]证明了所提出的嵌入CFD的气膜冷却模型的稳定性、低CPU开销水平(1%)和精度。对采用CFD嵌入模型的气膜冷却效率预测进行了评估。版权所有(2005)
Computational Fluid Dynamics (CFD) has been used recently for the simulation of the aerothermodynamics of film cooling. The direct calculation of a single cooling hole requires substantial computational resources. A parametric study, for the optimization of the cooling system in real engines, is much too time consuming due to the large number of grid nodes required to cover all injection holes and plenum chambers. For these reasons a hybrid approach is proposed, based on the modeling of the near film-cooling hole flow, tuned using experimental data, while computing directly the flow field in the blade-to-blade passage. A new injection film-cooling model is established, which can be embedded in a CFD code, to lower the Central Processing Unit (CPU) costs and reduce the simulation turnover time. The goal is to be able to simulate film-cooled turbine blades without having to explicitly mesh the holes with the plenum chamber. The stability, low CPU overhead level (1%) and accuracy of the proposed CFD-embedded film-cooling model, are demonstrated in the ETHZ steady film-cooled flat plate experiment [5] presented in Part I of this two-part paper. The prediction of film-cooling effectiveness using the CFD-embedded model is evaluated.Copyright © 2005 by ASME