摘要
在利用大涡模拟对汽车外部瞬态流场进行数值模拟的基础上,对天窗风振噪声进行了研究,获得了风振频率以及驾驶员耳旁的风振声压。通过分析一个周期内纵对称面上的流场变化,揭示了风振噪声的主要来源——天窗开口处涡的周期性脱落。提出了抑制风振噪声的措施,即安装导流板以及合理开启天窗,并重点对导流板的安装角度及外形、天窗不同开启程度进行了分析,给出了预测风振频率的经验公式,并对参考车型进行了实车道路试验。结果表明:2种措施都能有效控制风振噪声,而且当2种措施结合起来使用时,能完全消除风振;测试获得的风振频率与风振声压与计算仿真结果吻合较好。
Based on numerical simulation of automobile transient exterior flow field by using large eddy simulation,the sunroof wind buffeting noise was studied.Buffeting frequency and the sound pressure beside the driver＇s ears were obtained.Through analyzing the change of the flow field on longitudinal symmetry during one period,the main source of wind buffeting noise,i.e.the periodicity vortex shedding at the sunroof was revealed.According to the results of the simulation,two measurements were adopted to reduce the wind buffeting noise,namely installing a deflector and opening the sunroof on a reasonable position.The installation angle and the shape of the deflector were analyzed.Through analyzing different sunroof positions,the empirical formula which was used to forecast the buffeting frequency was obtained and the field road test of the reference model was done.The results show that two measurements can effectively reduce wind buffeting noise.When two measurements were combined,the wind buffeting was completely eliminated.The test results of the buffeting frequency and sound pressure are accordance with the simulation result.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2010年第6期108-114,共7页
China Journal of Highway and Transport
基金
国家高技术研究发展计划("八六三"计划)项目(2007AA04Z122)
湖南省科技计划重大项目(06FJ2001)
教育部长江学者和创新团队发展计划项目(531105050037)
关键词
汽车工程
风振噪声
大涡模拟
天窗
道路试验
automotive engineering
buffeting noise
large eddy simulation
sunroof
road test
