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| 1 | 旋翼翼型动态风洞试验技术研究显示文摘旋翼翼型的设计优化及性能确定亟须建立并发展翼型动态风洞试验技术。通过动力学仿真与结构优化设计,基于FL–11低速风洞研制出旋翼翼型两自由度动态试验装置,可实现俯仰/沉浮单自由或两自由度耦合运动,最高振荡频率达到5 Hz;基于FL–20连续式跨声速风洞研制出旋翼翼型高频高速动态试验装置,最高振荡频率达到17 Hz,试验最高雷诺数为5×106,模拟参数包线满足真实直升机参数要求;基于FL–14低速风洞研制出大尺度旋翼翼型动态试验装置,翼型模型弦长为800 mm,试验最高雷诺数达到4×106。完善了旋翼翼型动态试验精准测试相关技术,并开展了验证性试验,试验数据规律合理、量值可靠,表明试验系统及相关测试技术具有较高的可靠性,可为旋翼翼型动态气动特性试验评估提供重要的设备平台和技术支撑。 | 张卫国 李国强 李栋 车兵辉 顾艺 吴霖鑫 | 2023 | 实验流体力学2023，37，2： | 1 |
| 2 | Matched Volterra reduced-order model for an airfoil undergoing periodic translation显示文摘This paper is devoted to application of the Reduced-Order Model(ROM)based on Volterra series to prediction of lift and drag forces due to airfoil periodic translation in transonic flow region.When there is large amplitude oscillation of the relative Mach number,as appeared in helicopter rotor movement in forward flight,the conventional Volterra ROM is found to be unsatisfactory.To cover such applications,a matched Volterra ROM,inspired from previous multistep nonlinear indicial response method based on Duhamel integration,is thus considered,in which the step motions are defined inside a number of equal intervals with both positive and negative step motions to match the airfoil forward and backward movement,and the kernel functions are constructed independently at each interval.It shows that,at least for the translation movement considered,this matched Volterra ROM greatly improves the accuracy of prediction.Moreover,the matched Volterra ROM,with the total number of step motions and thus the computational cost close to those of the conventional Volterra ROM method,has the additional advantage that the same set of kernels can match various translation motions with different starting conditions so the kernels can be predesigned without knowing the specific motion of airfoil. | Lianrui NIE Ziniu WU | 2024 | Chinese Journal of Aeronautics2024，37，1： | 0 |
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