摘要
直升机沙盲现象不仅威胁飞行安全,而且会引发桨叶磨损,降低旋翼性能。为此,基于黏性涡粒子法和离散单元法的直升机沙盲分析模型计算沙云时变形态,耦合沙粒-桨叶冲击模型与桨叶磨损模型,考虑旋翼桨叶高速冲击磨损特性,建立沙盲环境直升机桨叶磨损分析方法。通过与镍合金、SS304不锈钢、双向碳纤维增强环氧树脂(CF/EP)、玻璃纤维增强环氧树脂(GF/EP)、聚氨酯(PU)、Ti-6Al-4V钛合金的靶板磨损试验对比,验证了分析方法的准确性。随后研究EH-60L直升机前飞沙盲环境的桨叶磨损特性,并分析飞行速度对桨叶磨损的影响特性。直升机沙盲环境下,桨叶与沙云碰撞程度、桨叶磨损、旋翼磨损区域均随时间延长而显著增加,同时,受桨叶进入沙云时间更长、沙粒冲击速度更大、冲击角度更大的影响,桨尖磨损远高于桨叶内侧。此外,桨尖磨损和旋翼磨损区域随飞行速度增加而先增大后减小。
The behavior of helicopter brownout endangers flight safety,induces rotor blade erosion,and reduces its performance.An analysis method of helicopter blade erosion in brownout condition is then proposed.In this method,variations of the sand cloud are simulated by a helicopter brownout model based on a viscous vortex particle method and a discrete element method,a collision and erosion models between blade and sand cloud are coupled,and the characteristics of blade erosion with high velocity is also considered.This work compares with experimental data of plane erosion with different impact velocities,impact angles,and materials,including nickel,SS304 stainless steel,bidirectional Carbon Fiber Reinforced Epoxy(CF/EP),Glass Fiber Reinforced Epoxy(GF/EP),Polyurethane(PU),and Ti-6Al-4V titanium,to validate the accuracy of the present method.The characteristics of blade erosion for the EH-60L helicopter in brownout condition is then analyzed,and the influence of flight speed on the blade erosion is also investigated.As time increases,the collision between the blade and the sand cloud,the blade erosion,and the rotor erosion zone significantly increases in helicopter brownout condition.Furthermore,the erosion in blade tip is significantly worse than inner blade due to the longer exposure time,larger impact velocity and angle.Additionally,the blade erosion and the rotor erosion zone increase firstly and then reduce with increasing flight speed.
作者
谭剑锋
闫羽泽
张卫国
刘亚奎
邵天双
TAN Jianfeng;YAN Yuze;ZHANG Weiguo;LIU Yakui;SHAO Tianshuang(School of Mechanical and Power Engineering,Nanjing Tech University,Nanjing 211816,China;Low Speed Aerodynamics Research Institute,China Aerodynamics Research and Development Center,Mianyang 621000,China;Aerodynamics Research Institute,Aviation Industry Corporation of China,Harbin 150066,China)
出处
《航空学报》
北大核心
2025年第9期280-293,共14页
Acta Aeronautica et Astronautica Sinica
基金
国家自然科学基金(12172165)
江苏省自然科学基金(BK20211259)
江苏省青蓝工程“优秀青年骨干教师”项目。
关键词
桨叶磨损
直升机沙盲
磨损模型
离散单元法
碰撞模型
blade erosion
helicopter brownout
erosion model
discrete element method
collision model
