Modelling the Flow Around Airfoils Equipped with Vortex Generators Using a Modified 2D Navier–Stokes Solver
Modelling the Flow Around Airfoils Equipped with Vortex Generators Using a Modified 2D Navier–Stokes Solver
复制标题
DOI：
10.1115/1.1850486
复制
发表时间：
2005-05
影响因子：
2.3
通讯作者：
I. Nikolaou;E. Politis;P. Chaviaropoulos
中科院分区：
文献类型：
--
作者：
I. Nikolaou;E. Politis;P. Chaviaropoulos
涡流发生器（Vortex Generator，VG）通常用于通过延迟流动分离来修整风力涡轮机叶片的气动和气动弹性性能。因此，需要开发可靠的、计算上仍然负担得起的模型，以供叶片设计者用于预测和增强配备有VG的翼型的空气动力学特性。本文提出了这样一个模型，特别是近失速和过失速翼型性能。从基本上描述叶片/VG配置周围复杂流动的三维Navier-Stokes方程出发，应用展向平均程序，得到一组等效的二维方程，并增加了额外的源项。这些条款使用基本涡流理论建模。在湍流中，湍流动能的产生项也被VG诱导的涡量增大。通过研究有无涡流发生器时流过叶片截面的气流，对模型进行了评估。本文还分析了9种可供选择的VG构型的性能，以证明翼型极对VG几何参数的敏感性。
Vortex generators (VGs) are commonly used for trimming the aerodynamic and aeroelastic performance of wind turbine blades by delaying flow separation. There is therefore a need for the development of reliable, still computationally affordable, models for blade designers to use to predict and enhance the aerodynamic characteristics of airfoils equipped with VGs. Such a model is proposed in the present paper, addressing in particular near-stall and post-stall airfoil performance. Starting from the three-dimensional Navier-Stokes equations that essentially describe the complex flow around a blade/VG configuration, a spanwise averaging procedure is applied, resulting in an equivalent set of two-dimensional equations, enriched with extra source terms. These terms are modelled using elementary vortex flow theory. In turbulent flows, the production term of the turbulent kinetic energy is also augmented by the vorticity induced by the VG. The model is evaluated by studying the flow past a blade section with and without VGs. An analysis of the performance of nine alternative VG configurations is also presented to demonstrate the sensitivity of the airfoil polars to the VG geometric parameters.