共轴刚性旋翼气动及噪声特性的参数影响分析
收稿日期: 2023-04-11
修回日期: 2023-05-15
录用日期: 2023-07-03
网络出版日期: 2023-07-07
基金资助
国家自然科学基金(11972190)
Parameter effects analysis on aerodynamic and aeroacoustic characteristics of coaxial rigid rotor
Received date: 2023-04-11
Revised date: 2023-05-15
Accepted date: 2023-07-03
Online published: 2023-07-07
Supported by
National Natural Science Foundation of China(11972190)
共轴刚性旋翼直升机是未来高速直升机发展的重要方向之一。研究了其前飞时旋翼桨-涡干扰（BVI）流场及气动噪声特性，探究了参数变化对其气动和噪声特性的影响规律。为精细捕捉旋翼尾迹流场，提出了一套高精度的共轴刚性旋翼直升机流场计算方法，该方法基于雷诺平均Navier-Stokes（RANS）方程为控制方程，并用五阶WENO-Z格式重构空间变量，以运动嵌套网格系统模拟旋翼桨叶运动。同时，使用了基于Farassat 1A公式的旋翼噪声计算方法，对旋翼桨-涡干扰噪声具有较高捕捉精度。应用所建立的方法，分别对孤立单旋翼、无机身共轴旋翼和有机身共轴旋翼流场进行计算对比，研究了该构型旋翼自身桨-涡干扰、旋翼间干扰和机身干扰对共轴刚性旋翼气动及噪声特性的影响。然后还计算分析了不同几何参数对共轴刚性旋翼气动及噪声特性的影响，得出了一些新的结论。
刘琦 , 史勇杰 , 胡志远 , 徐国华 . 共轴刚性旋翼气动及噪声特性的参数影响分析[J]. 航空学报, 2024 , 45(9) : 528856 -528856 . DOI: 10.7527/S1000-6893.2023.28856
The coaxial rigid rotor helicopter is an essential direction for the development of high-speed helicopters in the future. This paper studies the flow field of Blade-Vortex Interaction （BVI） and aeroacoustics characteristics of the coaxial rigid rotor helicopter during forward flight and explores the influence of parameter variations on its aerodynamic and aeroacoustics characteristics. To capture the rotor wake flow field accurately， a high-precision calculation method for the flow field of a coaxial rigid rotor helicopter is proposed. The method employs the Reynolds-Averaged Navier-Stokes （RANS） equation as the governing equation， adopts the fifth-order WENO-Z scheme to reconstruct the state variables， and simulates the motion of rotor blades using a moving overset grid system. Furthermore， a rotor noise calculation method based on Farassat 1A formula， which has high precision in capturing rotor BVI noise， is also utilized. By using those methods， the flow field of single isolated rotor， coaxial rotor without fuselage and coaxial rotor with fuselage are calculated and compared， and the effects of rotor self-BVIs， interference between rotors， and fuselage interference on the aerodynamic and aeroacoustics characteristics of the coaxial rigid rotor are studied. Additionally， the influence of different geometric parameters on the aerodynamic and aeroacoustics characteristics of the coaxial rigid rotor are calculated and analyzed， and new conclusions are obtained.
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