| 共轴双旋翼非定常流场干扰特性 |
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| 引用本文： | 卢丛玲,祁浩天,徐国华.共轴双旋翼非定常流场干扰特性[J].航空动力学报,2019,34(7):1459-1470. |
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| 作者姓名： | 卢丛玲 祁浩天 徐国华 |
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| 作者单位： | 南京航空航天大学直升机旋翼动力学国家级重点实验室,南京,210016;南京航空航天大学直升机旋翼动力学国家级重点实验室,南京,210016;南京航空航天大学直升机旋翼动力学国家级重点实验室,南京,210016 |
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| 基金项目： | 江苏高校优势学科建设工程基金 |
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| 摘 要： | 直升机共轴双旋翼相遇过程的非定常气动干扰在其周期性干扰中最为强烈。为了研究该过程中的干扰特征,建立了一个基于非定常雷诺平均Navier-Stokes方程的气动干扰数值方法,双旋翼的反转运动采用运动嵌套网格进行模拟。为了探究双旋翼相遇时的气动干扰机理,以两个相对运动的双翼型系统来模拟双旋翼特定展向截面的非定常相遇过程。分析了双旋翼和双翼型相遇时的气动特性和流场特征,并对双翼型系统进行了参数影响研究,结果表明:双旋翼上下桨叶相遇时,上下旋翼拉力均会出现先增后减的变化趋势且波动幅值分别为其对应总拉力的30%和22%,双翼型系统的升力波动趋势与之相似;间距增大使上下翼型间的气动干扰减小,且上下翼型升力波动对间距变化的敏感时间不同;翼型相对厚度增大使双翼型升力波动幅值增大,并出现二次波动;有附加来流时,相对来流速度较小的翼型升力波动的幅值与范围更大。
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| 关 键 词： | 共轴双旋翼 气动干扰 翼型 运动嵌套网格 Navier-Stokes方程 |
| 收稿时间： | 2018/9/27 0:00:00 |
Unsteady flow field interaction of coaxial rotor |
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| Abstract: | The aerodynamic interaction of coaxial rotor during the meeting of blades is most intense in the periodic interaction. In order to explore the characteristics of the flow field interference during the meeting of upper and lower blades of coaxial rotor, a numerical simulation method for aerodynamic interaction based on the unsteady Reynolds averaged Navier-Stokes (RANS) equations was established. Moving overset grid was applied to simulate the motion of the coaxial rotor. The motion of two airfoils with relative horizontal translations in the flow field was simulated to investigate the characteristics of flow field interference at a specific cross section of coaxial rotor. The variation of aerodynamic performance and the characteristics of flow field for the coaxial rotor and two airfoils system were analyzed, and the parameter effects of two airfoils system on the aerodynamic interaction were discussed. Results indicated that the lift increased first and then decreased dramatically during approaching of blades of the coaxial rotor and two airfoils system, and finally became stable. The lift fluctuation amplitude of upper and lower rotors was 30% and 22%, respectively. The aerodynamic interaction between the upper and lower airfoils decreased with the increase of the separation distance, and the lift fluctuation of the upper and lower airfoils changed differently to the variation of separation distance. The amplitude of the lift fluctuation of the two airfoils rose with the relative thickness of airfoil, and the secondary fluctuation occurred. The amplitude and range of the lift fluctuation of the airfoils with smaller relative inflow velocity were larger when there was extra inflow. |
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| Keywords: | coaxial rotor aerodynamic interaction airfoil moving overset mesh Navier-Stokes equations |
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