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清洁能源与新能源水平轴风力机叶片翼型流场的数值模拟闫海津,李佳,胡丹梅(上海电力学院能源与环境工程学院,上海200090)摘 要:为了直观形象地探讨水平轴风力机叶片翼型的气动特性,利用计算流体力学软件FLUENT对水平轴风力机叶片常用翼型NACA63425流场进行了数值模拟,得出了翼型NA-CA63425在不同来流攻角下的升力系数、阻力系数、升阻比和不同流攻角下的流场流线图和翼型表面的压力分布。
根据模拟结果对不同攻角下尾迹漩涡分离流动进行了分析和比较,得出该翼型气动特性随攻角的变化规律。
关键词:翼型;流场;尾迹分离;数值模拟中图分类号:T K83 文献标志码:B 文章编号:1005-7439(2010)02-0081-04Numerical Simulation on the Airfoil Flow Field of Horizontal Wind Turbine BladesYAN Ha-i jin,LI-Jia,HU Dan-mei(Scho ol of T hermal power&Environmental Engineer ing,Shanghai U niv ersity of Electr ic Po wer Shang hai200090,China)Abstract:T o discuss and analyze the air foil of ho rizo ntal wind tur bine blades mor e dir ect v iew ing and viv id,the airfo il N ACA63425used widely in the hor izontal w ind tur bine blades is numerically investigated by the Co mputatio na l F luid Dy namics softw are.T he co ef ficient s of lift and drag as well as the pr essure and velo city distr ibut ion are calculated in different angle of flow at tack fo r air foil N A CA63425.A nalysis and co mpar ison the vor tex separat ion flo w under the different ang le of flow attack,which wo rks o ut the aero dy namics cha racterist ics o f the airfo il N A CA63425.Keywords:a irfo il;flow;vo rtex separ ation;numerical simulation水平轴风力机运行时,如果翼型来流的攻角较大,绕翼型的流动边界层就会严重分离,因此准确获得翼型的气动特性对于风力机叶片设计非常重要,但是这种复杂的分离流动现象采用试验的方法测量非常困难,而且大量的试验将使翼型的设计周期延长和成本增加。
风力发电机组多物理场综合仿真研究近年来，全球对于新型能源的需求越来越高，风力发电作为一种最有发展潜力的新型能源，受到了广泛的关注和重视。
作为风力发电的核心装置，风力发电机组的可靠性和稳定性对于发电效率和整个风电系统的安全运行至关重要。
然而，由于环境影响和运行过程中各种内外部因素的复杂作用，风力发电机组存在着很多挑战。
为了提高风力发电机组的性能和可靠性，多个方面需综合考虑。
因此，多物理场综合仿真技术成为了研究和设计风力发电机组的一种重要手段。
风力发电机组的多物理场风力发电机组存在着多个物理场作用，包括机械力学场、电磁场、流体动力学场、热力学场等，每个物理场的变化都会对其他物理场产生影响，这也是为什么需要多物理场综合仿真的原因。
机械力学场主要涉及到风力发电机组的转子、轴承、齿轮和支架等部件，它们在风力发电机组的运行过程中起着重要的作用。
机械力学场的分析和研究可以帮助确定风力发电机组的结构设计和材料选择，同时也可提高机械系统的可靠性和降低零部件磨损，从而减少维修保养成本。
电磁场主要涉及到机内电机和齿轮箱中的电器元件，主要是永磁同步机和变频器。
电磁场的分析和研究可以优化机电系统的设计，减少能源损耗和提高发电效率。
流体动力学场主要涉及到风轮叶片和塔的结构，考虑风阻力和风的角度等因素。
流体动力学场的分析和研究可以确定叶片和塔的形状设计，优化风力发电机的性能和效率。
热力学场主要与发电机组温度相关，根据不同环境温度和转速进行平衡，在繁重工作条件下稳定温度可以保证设备的正常工作。
多物理场综合仿真技术多物理场综合仿真技术是指利用计算机模拟技术来模拟多个物理场相互的作用过程，对风力发电机组的整体性能、结构、运行情况进行模拟和分析，从而得出关键指标和结果。
多物理场综合仿真技术的核心是计算力学、数值分析和数值模拟方法。
计算机模型可以将风力发电机组的多个物理场相互联系起来，从而全面评估风力发电机组在各种条件下的性能和可靠性。
建筑物尾流区风资源利用的数值模拟刘子俊;卜京;孙健;朱卫平【摘要】ABSTRACT:This paper is based on Flunet and the standard k-εturbulence model is used to calculate the wind field around adjacent buildings with different heights. The paper analyzes how the height difference affects the wake area of the upstream building. First,under the same downstream building height, the further from the front of the building,the smaller the wind speed ratio will be. Second,in the wake areaof the upstream building,with the increase of the downstream building height, the peaks of the wind speed ratio will rise accordingly. The inlet wind speed is assumed as 5 m/s,the output power of the wind turbine under different downstream building heights are compared based on a small scale wind turbine EW1000. It can be seen that when the downstream building is low,the wind speed where the wind turbine installed is lower than the start-up wind speed;with the increase of altitude,the output power increases.%基于Fluent软件，利用标准的湍流模型，针对不等高的相邻建筑物建模，下游建筑物完全处于上游建筑物尾流区内，分析了上下游建筑物高度差对上游建筑物尾流区的影响：同一下游建筑高度下，越远离建筑物前沿，风速比越小；在上游建筑物尾流区内，随着下游建筑物高度的升高，风速比的峰值会相应升高。
Numerical Simulation of M-type Circular Tube Air-air Cooler with Circular Tubes for Doubly-fed Wind TurbineZhao Yang 1Zhi-ming Lu 2Xian-tai Li 1Wei Li 3(1.Depart of Research Center,Zhejiang ERG Technology Joint Stock Co.,Ltd.;2.Shanghai Institute of Applied Mathematics and Mechanics(School of Material Science and Engineering)Shanghai University；3.Yixing HuaYong Motor Co.,Ltd.)Abstract：The flow and heat transfer characteristics of a 5.25MW doubly-fed wind turbine with M-type circular tube air-air cooler has been studied by Computational Fluid Dynamics (CFD)simulation.A good agreement has been reached between experimental data and simulation result,which verifies the reliability of the numerical simulation.The calculation results show that energy economy of the heat exchange tubes located at the driving end of the wind turbine is the highest,and the overall heat transfer coefficient of the cooler is about 30W/m 2·K ,60%temperature efficiency.The pressure resistance of the internal and external air path can be calculated by the same calculation formula when the air volume of the internal passage is less than 5.0m 3/s.The internal air rate has a high level influence on the heat transfer performance of the cooler,only when the internal and external flow rate is perfectly matched within a certain range,the cooler is in a state of thermal power balance between hot and cold air flow,the wind turbine achieves its maximum energy performance rate.Keywords：Air-air Cooler；Wind Turbine；Numerical Simulation；Thermal Fluid Analysis摘要：本文采用数值模拟方法研究了5.25MW 双馈风力发电机M 型圆管空空冷却器的流动和传热特性，计算值与试验值较吻合，验证了数值模拟的可靠性。
·78·兵工自动化Ordnance Industry Automation2021-0540(5)doi: 10.7690/bgzdh.2021.05.018飞机地面滑行阶段尾部流场数值仿真周鹏宇1,2，李本威1，贾忠湖1，王强1，雷勇强3(1. 海军航空大学航空基础学院，山东烟台 264001；2. 中国人民解放军92326部队，广东湛江 524005；3. 中国空气动力研究与发展中心，四川绵阳 621000)摘要：为分析飞机起降地面滑行阶段尾部流场分布情况，以计算流体力学(computational fluid dynamics，CFD)为基础，以国外某高速飞机数模为研究对象，基于Delaunay非结构三角化网格划分方法，采用3维雷诺平均N-S方程、Realizable k-ε湍流模型和Roe离散格式，运用耦合隐式算法对全机外流场进行数值模拟。
以7°迎角滑行且考虑地面效应和尾喷流的情况下，对尾部压强场、温度场和速度场进行分析。
结果表明，尾流场压强在轴向和横向呈下降趋势，温度和速度在轴向呈下降趋势、在横向呈双峰趋势。
关键词：尾流场；地面效应；尾喷流；网格划分；数值仿真中图分类号：V211.3 文献标志码：ANumerical Simulation of Aircraft Tail Flow Field During Ground Taxiing Zhou Pengyu1,2, Li Benwei1, Jia Zhonghu1, Wang Qiang1, Lei Yongqiang3(1. College of Aviation Foundation, Navy Aviation University, Yantai 264001, China;2. No. 92326 Unit of PLA, Zhanjiang 524005, China;3. China Aerodynamics Research & Development Center, Mianyang 621000, China)Abstract: In order to analyze the distribution of the tail flow field during the take-off and landing ground taxiing phase, based on computational fluid dynamics (CFD), a foreign high-speed aircraft numerical model was studied, based on Delaunay unstructured triangulation mesh generation method, 3D Reynolds averaged N-S equation, Realizable k-εturbulence model and ROE discrete scheme are used to simulate the external flow field of the whole aircraft by coupling hide alorithm. The tail pressure field, temperature field and velocity field are analyzed under the condition of sliding at 7° angle of attack and considering the ground effect and tail jet. The results show that the pressure in the wake decreases in the axial and transverse directions, while the temperature and velocity decrease in the axial direction and double peak in the transverse direction.Keywords: flow field; ground effect; tail jet; grid division; numerical simulation0引言飞机起降阶段是发生飞行事故的多发阶段，据统计，约52%的空难发生在起飞和着陆时段[1]。
