| 引用本文: | 李晓华,郭正,柳兆伟,等.涵道风扇外形参数对气动特性的影响.[J].国防科技大学学报,2016,38(4):28-33.[点击复制] |
| LI Xiaohua,GUO Zheng,LIU Zhaowei,et al.Influence of ducted fan profile parameters on aerodynamic characteristics[J].Journal of National University of Defense Technology,2016,38(4):28-33[点击复制] |
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| 涵道风扇外形参数对气动特性的影响 |
| 李晓华, 郭正, 柳兆伟, 陈清阳 |
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(国防科技大学 航天科学与工程学院， 湖南 长沙 410073)
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| 摘要: |
| 以某涵道风扇为原型，从理论上分析涵道扩张角对涵道风扇气动特性的影响。运用滑移网格模型，采用三维不可压黏性Navier-Stokes控制方程，利用SST k-ω湍流模型，计算两叶桨气动特性，并与试验结果对比，验证该方法的可行性。分别计算涵道风扇在悬停状态下，3000～8500 r/min转速范围内，涵道唇口外形、扩张角和涵道高度对气动特性的影响，并对流场进行分析。椭圆形唇口的涵道风扇总拉力系数小，气动效率低；当涵道扩张角在8.2°附近时，功率系数相对最小，随着扩张角增大，在桨盘下方靠近涵道壁面附近出现气流分离；涵道拉力系数对涵道风扇高度的变化敏感度低，随着高度增加功率系数略有下降。 |
| 关键词: 涵道风扇 外形参数 气动特性 唇口外形 扩张角 涵道高度 |
| DOI：10.11887/j.cn.201604005 |
| 投稿日期：2015-06-22 |
| 基金项目:航空科学基金资助项目（20145788006） |
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| Influence of ducted fan profile parameters on aerodynamic characteristics |
| LI Xiaohua, GUO Zheng, LIU Zhaowei, CHEN Qingyang |
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(College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China)
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| Abstract: |
| The influence of ducted fan profile parameters to aerodynamic characteristics was investigated. The three dimensional incompressible viscous Navier Stokes equations and SST k-ω turbulence model were used to simulate the complex flow of a 2-blade propeller, which was based on the sliding mesh method. To demonstrate the feasibility of the method, the result was compared with the experimental data. The influences of the lip shape, diffuser angle, the height of duct on aerodynamic characteristics and the flow field were analyzed under the condition of hovering and within the limits of 3000 r/min to 8500 r/min. The thrust coefficient was produced by the ducted fan under the condition that the elliptical lip is smaller than the others, and its aerodynamic efficiency is very low. The power coefficient is the smallest when the diffuser angle is 8.2°. The flow separation emerges nearer to the duct under the propeller disk, with the increase of diffuser angle. The sensitivity of thrust coefficient to the change of ducted fan height is low. The power coefficient descends slightly with the increase of height. |
| Keywords: ducted fan profile parameter aerodynamic characteristics lip shape diffuser angle height of duct |
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