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论文:2021,Vol:39,Issue(4):721-730 |
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引用本文： |
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张阳, 周洲, 李旭. 低雷诺数条件下湍流度及湍流梯度对翼型气动特性的影响[J]. 西北工业大学学报 |
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ZHANG Yang, ZHOU Zhou, LI Xu. Effect of turbulence intensity and gradient of turbulence intensity on airfoil aerodynamic characteristics at low Reynolds number[J]. Northwestern polytechnical university |
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| 低雷诺数条件下湍流度及湍流梯度对翼型气动特性的影响 |
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| 张阳, 周洲, 李旭 |
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| 西北工业大学 航空学院, 陕西 西安 710072 |
| 摘要: |
| 以分布式动力垂直起降（VTOL）飞行器起降时的复杂流场研究为背景，对低雷诺数条件下来流湍流度/湍流梯度对翼型的气动特性影响进行了研究。采用C型结构网格及γ-Reθt转捩模型求解非定常雷诺平均Navier-Stokes（URANS）方程的方法，对NACA0012翼型在不同湍流度/雷诺数下的气动特性进行了研究，并与实验值进行对比，验证了计算方法的可靠性。研究了不同湍流度、雷诺数及湍流度梯度对翼型气动特性的影响，分析了其对翼型绕流转捩过程产生影响的机理。研究表明，处于较高湍流度或雷诺数的翼型绕流流动特征更加稳定，分离泡尺度更小，流动分离有所推迟，失速迎角更大，但是二者对转捩提前作用的机理不同；湍流度梯度对翼型的气动影响受到雷诺数及湍流度大小的限制，处于较高湍流度梯度的翼型绕流在流动分离、转捩及再附方面均得到了提前；层流分离泡的产生和演化与湍流度及雷诺数大小密切相关，其尺度与位置也影响着翼型的气动特性。 |
| 关键词:
垂直起降
非定常
低雷诺数
湍流度
层流分离泡
转捩
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| Effect of turbulence intensity and gradient of turbulence intensity on airfoil aerodynamic characteristics at low Reynolds number |
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| ZHANG Yang, ZHOU Zhou, LI Xu |
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| School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China |
| Abstract: |
| Based on the complex flow field of vertical takeoff and landing (VTOL) aircraft with distributed propulsion, the influence of the turbulence intensity and gradient of turbulence intensity on the aerodynamic characteristics of two-dimensional airfoil under low Reynolds number was studied by solving the unsteady Reynolds averaged Navier-Stokes (URANS) Equation based on the c-type structural mesh and γ-Reθt transition model. The aerodynamic characteristics of NACA0012 airfoil at different turbulence intensities and Reynolds numbers are simulated and compared with the experimental data, which verifies the reliability of the low Reynolds number calculation method. Meanwhile, the effects of the different low Reynolds number and gradient of turbulence intensity on the aero-dynamic characteristics of airfoil are studied, and the effect mechanism of the turbulence on the flow field around airfoil is analyzed. It shows that the flow characteristics of the airfoil with high turbulence or Reynolds number are more stable, the separation bubble size is smaller, the flow separation is delayed, and the stall angle of attack is larger, but the effect of the two mechanisms on the earlier transition is different. The influence of the turbulence gradient on the airfoil is limited by the Reynolds number, and the flow separation, transition and reattachment of the airfoil with high turbulence gradient are advance. The generation and evolution of the laminar separation bubble are closely related to the turbulence intensity and Reynolds number, and its scale and location also affect the aerodynamic characteristics of the airfoil. |
| Key words:
vertical takeoff and landing (VTOL)
unsteady Reynolds averaged Navier-Stokes (URANS)
low Reynolds number
turbulence intensity
laminar separation bubble
transition
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| 收稿日期: 2020-09-29
修回日期:
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| DOI: 10.1051/jnwpu/20213940721 |
| 基金项目: 陕西省重点研发项目（2021ZDLGY09-08）与大院大所创新计划（TC2018DYDS24）资助 |
| 通讯作者: 周洲(1966-),女,西北工业大学教授,主要从事飞行器设计研究。e-mail:zhouzhou@nwpu.edu.cn
Email：zhouzhou@nwpu.edu.cn |
| 作者简介: 张阳(1991-),西北工业大学博士研究生,主要从事垂直起降飞行器及分布式动力设计研究。
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| 张阳 在本刊中的所有文章 |
| 周洲 在本刊中的所有文章 |
| 李旭 在本刊中的所有文章 |
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参考文献: |
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[1] 刘凯,叶赋晨.垂直起降飞行器的发展动态和趋势分析[J].航空工程进展,2015,6(2):127-138,159 LIU Kai, YE Fuchen. Review and analysis of recent developments for VTOL vehicles[J]. Advances in Aeronautical Science and Engineering, 2015,6(2):127-138,159(in Chinese)
[2] ZHANG Yang, ZHOU Zhou, WANG Kelei. Aerodynamic characteristics of different airfoils under varied turbulence intensities at low Reynolds numbers[J]. Applied Sciences,2020,10(5):1076
[3] GRZEKAK Joanna. Influence of freestream turbulence intensity on bypass transition parameters in a boundary layer[J]. Journal of Fluids Engineering, 2017, 139(5):051201
[4] MISTF P, DEVENPORT W. Mean loading effects on the surface pressure fluctuations on an airfoil in turbulence[C]//7th AIAA/CEAS Aeroacoustics Conterence and Exhibit, 2001
[5] PORTÉ-AGEL F, WU Y T, LU H, et al. Large-eddy simulation of atmospheric boundary layer flow through wind turbines and wind farms[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2011, 99:154-168
[6] MCAULIFFE B R, YARAS M I. Transition mechanisms in separation bubbles under low-and elevated-freestream turbulence[J]. Journal of Turbomachinery, 2010, 132(1):011004
[7] LENGANI D, SIMONI D. Recognition of coherent structures in the boundary layer of a low-pressure-turbine blade for different freestream turbulence intensity levels[J]. International Journal of Heat and Fluid Flow, 2015, 54:1-13
[8] BRYAN D M, Michael S S. Oil flow measurements on several airfoils at low reynolds numbers[C]//21st AIAA Applied Aerodynamics Conference, Orlando, Florida, 2003
[9] GILLING Lasse. Detached eddy simulations of an airfoil in turbulent inflow[C]//47th AIAA Aerospace Sciences Meeting Including the New Horizons Forum CMD Aerospace Exposition, 2009
[10] 王庶,米建春.大湍流度对超低雷诺数下翼型受力及绕流的影响[J].航空学报,2011,32(1):41-48 WANG Shu, MI Jianchun. Effect of large turbulence intensity on airfoil load and flow[J]. Acta Aeronautica et Astronautica Sinica,2011,32(1):41-48(in Chinese)
[11] 陈亦. 航空气动计算中的转捩预测方法研究[D]. 西安:西北工业大学, 2008:23-46 CHEN Yi. On the transition prediction for aeronautical application[D]. Xi'an:Northwestern Polytechnical University, 2008:23-46(in Chinese)
[12] MENTER F R, LANGTRY R B, LIKKI S R. et al. A correlation based transition model using local variables part1-model formulation[J]. Journal of Turbomachinery, 2006, 128(3):413-422
[13] LANGTRY R B, MENTER F R, LIKKI S R. a correlation based transition model using local variables part 2-test cases and industrial applications[R]. ASME 2004-GT-53434
[14] 张彦军,赵轲. 雷诺数变化对翼型边界层发展及失速特性的影响[J]. 航空工程进展,2019,10(3):319-329 ZHANG Yanjun, ZHAO Ke. The influence of Reynolds number on boundary layer development and stall characteristics of airfoil[J]. Advances in Aeronautical Science and Engineering 2019, 10(3):319-329(in Chinese)
[15] 刘强,刘强,白鹏. 不同雷诺数下翼型气动特性及层流分离现象演化[J]. 航空学报,2017,38(4):27-39 LIU Qiang, LIU Qiang, BAI Peng. Aerodynamic characteristics of airfoil and evolution of laminar separation at different Reynolds numbers[J]. Acta Aeronautica et Astronautica Sinica, 2017,38(4):27-39(in Chinese)
[16] SIMONI D, LENGANI D. Inspection of the dynamic properties of laminar separation bubbles:free-stream turbulence intensity effects for different reynolds numbers[J]. Experiments in Fluids 2017, 58(6):66 |
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