用于BVI噪声试验的新型涡发生器设计与分析

Design and Analysis of New Type Vortex Generator for BVI Noise Experiment

针对直升机特有的旋翼桨/涡干扰(Blade vortex interaction,BVI)噪声计算精度低且试验数据缺乏问题,也为了开展旋翼气动噪声特性分离方法的验证试验研究,本文设计了一种能够用于BVI噪声试验的新型多段翼型组合式涡发生器。首先通过CATIA软件建立涡发生器出口端翼型段在不同迎角下的试验模型,再使用FLUENT软件建立涡发生器的流场仿真计算模型,比较分析了不同翼型段迎角下的涡流流场。随后用粒子图像测速法(Particle image velocimetry,PIV)技术系统测量了不同翼型段迎角、距离涡发生器出口端的长度及流速等参数变化下的涡流流场,对不同试验状态下的涡核、涡强等参数进行了对比分析。针对涡量偏弱的缺点,对传统单级涡发生器进行了改进,设计研发了双级涡发生段。试验证明其能产生更强且稳定的涡,为BVI噪声试验提供了模拟的桨尖涡,试验结果表明了涡发生器的有效性。

Aiming at the low precision and lacking of test data of blade vortex interaction(BVI)noise,and in order to conduct an experimental research about the separation of rotor noise,a new multi-airfoil vor-tex generator is designed.Firstly,a model of vortex generator of different angles of attack of airfoil sec-tion by CATIA software is established.Secondly,flowfield of vortex generator is simulated by FLU-ENT software in order to analyze the influence of different angles of attack.By the particle image veloti-metry(PIV)technology,the flowfield of airfoil with different angles of attack and different distances to the vortex generator of different flow velocity are measured,then the experimental results are analyzed.Aiming at the weak vortex core and density,the traditional one-stage vortex generator is improved by increasing an airfoil section and it can produce steadier and stronger vortex than one-stage vortex gen-erator proved by PIV test.The new vortex generator is successfully used in the BVI noise experi-ments.