Numerical modeling of an S809 airfoil under dynamic stall, erosion and high reduced frequencies
Numerical modeling of an S809 airfoil under dynamic stall, erosion and high reduced frequencies
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DOI：
10.1016/j.apenergy.2011.04.037
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发表时间：
2012-05-01
期刊：
影响因子：
11.2
通讯作者：
Johnson, David A.
中科院分区：
文献类型：
--
作者：
Gharali, Kobra;Johnson, David A.
利用ANSYS Fluent 12.1软件对S809翼型绕静止翼型的自由振荡进行了数值模拟。为了比较，用Realizable k-ε和SST k-ω模型模拟了层流-湍流转捩，最后选用SST k-ω模型。在可能的情况下，将呈现动态失速现象的所得气动力系数与俯仰振荡S809翼型的现有实验和半经验数据的气动力系数进行比较。模拟扩展到几个雷诺数，10（4），10（5）和10（6），大范围的约化频率，从0.026到18。根据尾流速度剖面、涡量等值线和空气动力系数，研究了结果对折合频率的依赖程度。针对在役涡轮机叶片普遍存在的前缘冲蚀问题，根据涡轮机运行工况下叶片前缘冲蚀的范围，对叶片前缘冲蚀进行了数值模拟。针对受侵蚀翼型，详细研究了升力下降对涡轮机性能的严重影响。(C)2011爱思唯尔有限公司保留所有权利。
An oscillating freestream over a stationary S809 airfoil is simulated numerically using ANSYS Fluent 12.1. For comparison the laminar-turbulent transition is simulated with the realizable k-epsilon and SST k-omega models, and finally the SST k-omega model is chosen. Where possible, the resultant aerodynamic coefficients presenting dynamic stall phenomena are compared with aerodynamic coefficients from existing experimental and semi-empirical data for a pitch oscillating S809 airfoil. The simulation was extended for several Reynolds numbers, 10(4), 10(5) and 10(6), for a large range of the reduced frequency, from 0.026 to 18. The level of the dependency of the results on the reduced frequency is examined based on wake velocity profiles, vorticity contours and aerodynamic coefficients. Leading edge erosion, which is a common problem for in-service wind turbine blades, is simulated based on the range of erosion found in turbine operating conditions. For the eroded airfoil, the lift decrease, causing a severe impact on wind turbine performance, was investigated in detail. (C) 2011 Elsevier Ltd. All rights reserved.