Modeling Vortex Generating Jet-Induced Transition in Low-Pressure Turbines
Modeling Vortex Generating Jet-Induced Transition in Low-Pressure Turbines
复制标题
低压涡轮机中涡流产生射流诱发转变的建模
DOI：
10.1115/1.4025735
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发表时间：
2014
影响因子：
1.7
通讯作者：
J. Seume
中科院分区：
文献类型：
--
作者：
Florian Herbst;A. Fiala;J. Seume
具有稳定喷射涡流发生射流 (VGJ) 的低压涡轮机 (LPT) 的当前设计采用稳定计算流体动力学 (CFD)。目前的工作旨在通过提出一种新的用于注入引起的层流-湍流边界层转变的半经验转变模型来支持这种设计方法。它基于对边界层中的横流涡流的检测，该涡流会导致拐点横流速度剖面。该模型在 γ-Reθ 转变模型框架内的 CFD 代码 TRACE 中实现，并且是先前提出的模型的重新制定、重新校准和扩展版本。它通过 VGJ 以及非 VGJ 测试用例进行了广泛的验证，以物理上合理的方式捕获本地转换过程。几种 VGJ 配置的定量气动设计参数（包括稳态和周期性非稳态流入条件）的预测与实验值非常一致。此外，通过检测典型的二次流结构改进了LPT端壁流动的定量预测。新导出的模型首次允许使用 VGJ 定量设计和优化 LPT。
The current design of low-pressure turbines (LPTs) with steady-blowing vortex generating jets (VGJs) uses steady computational fluid dynamics (CFD). The present work aims to support this design approach by proposing a new semiempirical transition model for injection-induced laminar-turbulent boundary layer transition. It is based on the detection of cross-flow vortices in the boundary layer which cause inflectional cross-flow velocity profiles. The model is implemented in the CFD code TRACE within the framework of the γ-Reθ transition model and is a reformulated, recalibrated, and extended version of a previously presented model. It is extensively validated by means of VGJ as well as non-VGJ test cases capturing the local transition process in a physically reasonable way. Quantitative aerodynamic design parameters of several VGJ configurations including steady and periodic-unsteady inflow conditions are predicted in good accordance with experimental values. Furthermore, the quantitative prediction of end-wall flows of LPTs is improved by detecting typical secondary flow structures. For the first time, the newly derived model allows the quantitative design and optimization of LPTs with VGJs.