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一种升浮一体环形浮空器气动特性研究

Investigation on the Aerodynamics of a Buoyancy-Lifting Annular Aerostat
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摘要 选取填充轻质气体的环形浮空器为研究对象,采用数值模拟方法开展高空风力发电机用浮空器气动特性研究.采用有限体积法求解不可压N-S方程和S-A湍流模型来数值模拟风力机气流场,分别对翼型,安装角,长细比,雷诺数及风力机等因素对引入浮力后浮空器气动特性影响进行研究,对比分析引入浮力后布局外形气动力特性随各外形特征参数的变化规律.数值结果表明,截面翼型弯度越大,最大升阻比越小,其出现位置有一定前移;截面厚度越大,三维效应越强,最大升阻比出现有一定的滞后性;增大安装角,相当于增大攻角,使得升力系数和阻力系数随攻角变化曲线均有一定前移;引入浮力后,最大合升阻比增大,并且存在一个明显前移;长细比越小,浮空器升阻比越大,随着长细比增大,浮空器最大升阻比出现越滞后;一定范围内,雷诺数增大,浮空器动升阻比增大,引入浮力后,当来流风速变化时,浮空器合升阻比随雷诺数增大先迅速减小然后趋于平缓,但基于浮空器尺寸变化时,合升阻比则随雷诺数增大而增大;风轮转速增大,浮空器阻力增大,升力有一定下降. The annular aerostat with light gas is studied in this paper. The aerodynamic characteristics of high attitude turbine is investigated by using numerical simulation. The finite volume method is used to solve incompressible Navier-Stokes equations. The S-A model is also applied to simulate the flow field of turbine. The aerodynamics of aerostat is described in terms of airfoil, installation angle, slenderness ratio, Reynolds number and the turbine. The effects of configuration on the aerodynamic of aerostat after bringing in buoyancy are analyzed. The simulation results show that the bigger the cross section bending of the airfoil of the aerostat is, the smaller the maximum lift-to-drag ratio is; the bigger the cross section thickness of airfoil of the aerostat is, the stronger the three-dimensional effect is. The attack angle increases with the increasing of the installation angle, which leads to the advance of the appearance of maximum lift-to-drag ratio. The resultant lift-to-drag ratio curve increases and moves forward obviously after bringing in buoyancy. The smaller the slenderness ratio of the aerostat is, the bigger the lift coefficient becomes. The appearance of maximum lift-to-drag ratio will be lagged with the increasing of slenderness ratio. Based on the change of the wind velocity, the resultant lift-to-drag ratio decreases rapidly first and then tend to decreasing gently after bringing in the buoyancy. However, based on the change of the aerostat size, the lift-to-drag ratio of the aerostat increases with the increasing of Reynolds number. The drag of the aerostat increases and the lift of the aerostat decreases with the increasing of turbine rotate speed.
作者 喻海川 闫溟 陈冰雁 YU Haichuan, YAN Ming, CHEN Bingyan (China Academy of Aerospace Aerodynamics, Beijing 100074, China)
出处 《力学季刊》 CSCD 北大核心 2018年第1期138-147,共10页 Chinese Quarterly of Mechanics
关键词 环形浮空器 翼型 安装角 升阻比 长细比 风轮转速 annular aerostat airfoil installation angle lift-to-drag ratio slenderness ratio turbine rotate speed
作者简介 喻海川,硕士,助理工程师.研究方向:高空风力发电机.Email:1012972671@qq.com通信作者:喻海川.Email:1012972671@qq.com
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