大气环境对直升机旋翼桨-涡干扰噪声辐射特性的影响  

Effects of Atmospheric Environment on Helicopter Blade-Vortex Interaction Noise Radiation Characteristics

作　　者：王菲 徐国华[2] 胡志远 WANG Fei;XU Guohua;HU Zhiyuan(China Helicopter Research and Development Institute,Jingdezhen,333001,China;National Key Laboratory of Science and Technology on Rotorcraft Aeromechanics,Nanjing University of Aeronautics&Astronautics,Nanjing,210016,China)

机构地区：[1]中国直升机设计研究所,景德镇333001 [2]南京航空航天大学直升机旋翼动力学国家级重点实验室,南京210016

出　　处：《南京航空航天大学学报》2020年第2期304-310,共7页Journal of Nanjing University of Aeronautics & Astronautics

摘　　要：建立了一个适用于旋翼桨-涡干扰气动载荷计算的计算流体力学(Computational fluid dynamics,CFD)/自由尾迹耦合模型,为提高计算效率,提出了一种高效的耦合策略进行不同计算域间的信息交换策略。在此基础上,结合基于声类比法的FW-H方程构建了旋翼桨-涡干扰噪声的计算方法。应用所建立的方法,以OLS(Operational loads survey)旋翼为研究对象,深入分析了大气环境对旋翼噪声辐射特性的影响。研究发现:随着飞行高度的增加,旋翼噪声辐射特性发生了明显的改变,逐渐由桨盘前行侧转变为指向桨盘前方,噪声幅值先增大后减小。文中从桨-涡干扰距离、干扰位置变化角度计算分析了大气压力、音速及空气密度等环境参数对旋翼桨-涡干扰噪声辐射特性的影响,并得出了一些有实际意义的影响规律。A coupled CFD/free-wake method is developed in this paper to predict the rotor blade-vortex interaction aerodynamics. In order to improve computational efficiency,an efficient coupling strategy is presented here to pass the flow variables between two domains. Based on this,the FW-H equation is adopted to predict the rotor blade-vortex interaction noise. By the method,the effects of atmospheric environment on blade-vortex interaction noise radiation characteristics of operational loads survey(OLS)rotor are analyzed.The results indicate that with the increase of flight height,an apparent variation of radiation characteristics happen,namely the noise hot spot shifts to the front part of rotor plane from the advancing side of rotor plan and the maximum sound pressure level(SPL)first increase and then decrease. In view of this phenomenon,the effects of atmosphere pressure,sound velocity and air density on rotor blade-vortex interaction noise radiation characteristics are deeply analyzed from the variation of miss-distance and interaction locations.

关 键 词：直升机 旋翼 桨-涡干扰噪声 耦合方法 大气环境 

分 类 号：V211.52[航空宇航科学与技术—航空宇航推进理论与工程]