Evaluating the Acoustic Benefits of Over-the-Rotor Acoustic Treatments Installed on the Advanced Noise Control Fan
Evaluating the Acoustic Benefits of Over-the-Rotor Acoustic Treatments Installed on the Advanced Noise Control Fan
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评估先进噪声控制风扇上安装的转子上声学处理的声学效益
DOI：
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发表时间：
2017
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影响因子：
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通讯作者：
B. Tester
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作者：
Matthew R. Gazella;T. Takakura;D. Sutliff;Richard F. Bozak;B. Tester
在过去的15年里，美国宇航局已经评估了转子上的声学处理，并取得了不同的成功。最近，美国宇航局一直在开发下一代的转子声学处理风扇降噪。NASA格伦研究中心的先进噪音控制风扇被用作低技术准备水平测试台。采用了由50个麦克风组成的快速原型管道阵列，并用于将管道分析与远场声级相关联，并验证现有的波束形成器方法。该测试的目的是通过加深对物理机制的理解和预测远场声学益处来提高各种转子上声学处理的技术就绪水平。AAPL =航空声学推进实验室ADP =先进管道推进器ANCF =先进噪声控制风扇CFANS =可配置风扇人工源FML =泡沫金属衬里HW =硬壁LSWT =低速风洞OTR =转子上OASPL =总声功率级PWL =声功率级RPMC =每分钟转数SDT =源诊断测试1航空航天工程师，高速系统部，AIAA学生会员。2博士后研究助理，圣母大学涡轮机械实验室，AIAA学生会员。3 AIAA声学分支航空航天工程师，副研究员。4 AIAA成员，声学分支，航空航天工程师。5 AIAA高级成员，工程与环境学院首席研究员。https://ntrs.nasa.gov/search.jsp?粤ICP备170170006851号-1
Over the last 15 years, over-the-rotor acoustic treatments have been evaluated by NASA with varying success. Recently, NASA has been developing the next generation of over-the-rotor acoustic treatments for fan noise reduction. The NASA Glenn Research Center’s Advanced Noise Control Fan was used as a Low Technology Readiness Level test bed. A rapid prototyped in-duct array consisting of 50 microphones was employed, and used to correlate the in-duct analysis to the far-field acoustic levels and to validate an existing beam-former method. The goal of this testing was to improve the Technology Readiness Level of various over-the-rotor acoustic treatments by advancing the understanding of the physical mechanisms and projecting the far-field acoustic benefit. Nomenclature AAPL = Aero-Acoustic Propulsion Laboratory ADP = Advanced Ducted Propulsor ANCF = Advanced Noise Control Fan CFANS = Configurable Fan Artificial Source FML = Foam-Metal-Liner HW = Hardwall LSWT = Low-Speed Wind-Tunnel OTR = Over-the-rotor OASPL = Over-all Sound Power Level PWL = Acoustic Sound Power Level RPMC = Revolutions-Per-Minute (Corrected) SDT = Source Diagnostic Test 1 Aerospace Engineer, High Speed Systems Division, AIAA Student Member. 2 Postdoctoral Research Associate, Notre Dame Turbomachinery Laboratory, AIAA Student Member. 3 Aerospace Engineer, Acoustics Branch, Associate Fellow, AIAA. 4 Aerospace Engineer, Acoustics Branch, AIAA Member. 5 Principal Research Fellow, Faculty of Engineering and the Environment, AIAA Senior Member. https://ntrs.nasa.gov/search.jsp?R=20170006851 2019-11-18T10:58:24+00:00Z