首页|期刊简介|投稿指南|分类索引|刊文选读|订阅指南|资料|样刊邮寄查询|常见问题解答|联系我们
李旦望,夏 烨. 民用航空发动机外涵支板声衬的降噪技术研究[J]. 科学技术与工程, 2020, 20(23): 9647-9654.
LI Dan-wang,XIA Ye.Noise reduction research on bypass Strut acoustic liner of the High Bypass Ratio Turbofan Engine[J].Science Technology and Engineering,2020,20(23):9647-9654.
民用航空发动机外涵支板声衬的降噪技术研究
Noise reduction research on bypass Strut acoustic liner of the High Bypass Ratio Turbofan Engine
投稿时间:2019-10-09  修订日期:2020-05-10
DOI:
中文关键词:  大涵道比涡扇发动机  风扇后传声  外涵支板  声散射  声衬
英文关键词:High bypass ratio turbofan engine  Aft fan noise  Bypass strut  Acoustic scattering  Acoustic liner
基金项目:国家重点研发计划项目
     
作者单位
李旦望 中国航发商用航空发动机有限责任公司
夏 烨 中国航发商用航空发动机有限责任公司
摘要点击次数: 121
全文下载次数: 58
中文摘要:
      为了研究民用大涵道比涡扇发动机风扇外涵支板对风扇转静干涉噪声后传声散射效应的影响,以及外涵支板布置声衬的降噪效果,本文基于有限元方法,首先研究了等截面圆形管道和环形的声传播和远场声辐射特性,并与解析结果进行对比,吻合地较好,表明了该声传播计算方法的可靠性和精度;然后开展对于包含外涵支板的某真实大涵道比涡扇发动机外涵管道的风扇转静干涉噪声后传声分析,最后开展外涵支板声衬的声阻抗优化设计,在约束条件内获得最优声阻抗,研究外涵支板布置声衬对风扇转静干涉噪声后传声的降噪效果。结果表明:有外涵支板的情况下,声波在管道内出现声散射现象,声压幅值较无支板情况明显增大,且在支板附近出现峰值;外涵支板布置声衬后,在最优声阻抗的情况下,单频单模态的降噪量可达22.57dB。
英文摘要:
      In order to investigate the effects of bypass strut on aft fan noise propagation of the high bypass ratio turbofan engine, and the noise reduction effect of bypass strut acoustic liner, the numerical simulation of this paper is based on finite element method. Firstly, the uniform section circular duct and annular duct are selected for numerical validations. The simulation results are well-matched with analytical results. Then the numerical simulation of aft fan noise propagation of a real high bypass ratio turbofan engine is calculated. At last the bypass strut acoustic liner optimization design is done in constraint condition to gain the optimal acoustic impedance. The results show that for the reason of bypass strut, acoustic scattering appears and the amplitude increases, the peak occurs nearby the bypass strut, and for single frequency and single acoustic mode, the insertion loss of bypass strut acoustic line with optimal acoustic impedance can reach 22.57dB.
查看全文  查看/发表评论  下载PDF阅读器
关闭
你是第32690702位访问者
版权所有:科学技术与工程编辑部
主管:中国科学技术协会    主办:中国技术经济学会
Tel:(010)62118920 E-mail:stae@vip.163.com
京ICP备05035734号-4
技术支持:本系统由北京勤云科技发展有限公司设计

京公网安备 11010802029091号