摘要
本文采用粒子图像/追踪测速技术(PIV/PTV),对直升机旋翼近地悬停诱导的“沙盲”风沙两相流进行了测量。通过Γ2涡心识别和模态分解方法,精细描绘了尾流场中桨尖涡偏转、合并耗散的过程,并揭示了该过程中不同区域主导模态的空间分布形态和频率特征。通过对颗粒运动过程的观察,发现了颗粒受尾流场激励形成的波浪状团聚扩散结构。地表颗粒在近地区域(x/R=2~3)内被大量激励起动。对流场模态数据的相关分析表明,该区域内颗粒的起动与桨尖涡合并后形成的大尺度耗散结构的输运密切相关。
The PIV/PTV two-phase flow measurement is employed to study the“brownout”two-phase flow induced by a near-ground hovering helicopter rotor.The deflection of the rotor tip vortex trajectory and the merging progress of vortex pairs are characterized throughΓ2 vortex core identification and modal decomposition.POD results reveal the spatial distribution and frequency characteristics of dominant modes in different wake field regions.The instantaneous particle distributions exhibit wave-like pattern excited by the wake field.Large quantities of particles are identified in the near region of x/R=2–3.Correlation analysis of POD mode coefficients indicates a close relationship between particle entrainment in this region and the transport of large-scale flow structures formed in the wake field.
作者
王少飞
潘翀
张卫国
刘亚奎
齐中阳
WANG Shaofei;PAN Chong;ZHANG Weiguo;LIU Yakui;QI Zhongyang(Aircraft and Propulsion Laboratory,Ningbo Institute of Technology,Beihang University,Ningbo 315800,China;Key Laboratory of Fluid Mechanics of Ministry of Education,Beihang University,Beijing 100191,China;Key Laboratory of Rotor Aerodynamics,China Aerodynamics Research and Development Center,Mianyang 621000,China)
出处
《实验流体力学》
北大核心
2025年第4期28-35,共8页
Journal of Experiments in Fluid Mechanics
基金
中国空气动力研究与发展中心旋翼空气动力学重点实验室研究开放课题项目(RAL202204-2)
浙江省自然基金项目(LY24A020002)。
