空气动力学学报2025，Vol.43Issue(11)：35-42,8.DOI:10.7638/kqdlxxb-2024.0112
旋翼翼型俯仰沉浮耦合动态失速特性
Dynamic stall characteristics of a rotor airfoil under coupled pitching-plunging motions
摘要
Abstract
The blade of a helicopter rotor encounters plunging motion in addition to periodic pitching oscillations during actual flight,which complicates the flow field structure and dynamic stall characteristics.The NACA 0015 rotor airfoil is selected as the study subject to examine the aerodynamic properties and stall mechanisms of multi-degree-of-freedom oscillations in a high-Reynolds-number rotor.The pitching-plunging coupled motion at a Reynolds number of 2.0×106 is simulated using the Realizable k-ε turbulence model with a moving overset grid.Additional analysis is conducted on how the phase angle between pitching and plunging motions affects the dynamic stall characteristics.The results indicate that the downward motion is the primary phase during which the airfoil generates lift.Under high-Reynolds-number conditions,increasing the plunging amplitude to 150 mm allows the pure plunging motion to produce thrust.During upward movement,the airfoil encounters greater drag,raising the coupled motion's overall drag coefficient.The opposite effect is seen during the downward movement.At a phase angle of φ=π/2,the increase in the effective angle of attack(a combination of the pitching angle and the induced angle from the plunging motion)delays the lift stall angle by approximately 1°.However,the peak value of the drag coefficient increases by 56.9%compared with the pure pitching state.The plunging motion significantly impacts the development of the separation zone on the airfoil's upper surface,as well as the evolution and interaction of dynamic vortex structures across different scales and frequency domains.These effects result in differences in the aerodynamic force curves of the coupled motion and amplify the fluctuations during the negative pitch stroke.关键词
直升机/旋翼/高雷诺数/动态失速/俯仰沉浮耦合运动Key words
helicopter/rotor/high Reynolds number/dynamic stall/pitching-plunging coupled motion分类
航空航天引用本文复制引用
WU Jiaqiang,LI Lang,LI Guoqiang,SHEN Juncheng,YU Jieru,CHEN Ruifeng..旋翼翼型俯仰沉浮耦合动态失速特性[J].空气动力学学报,2025,43(11):35-42,8.基金项目
空天飞行空气动力科学与技术全国重点实验室基金(2023-YJKODL-F40301065) （2023-YJKODL-F40301065）
