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An experimental investigation of the grazing flow impedance duct at the University of Florida for acoustic liner applications.

机译：佛罗里达大学用于声学衬管应用的掠流阻抗导管的实验研究。

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摘要

Acoustic liners remain the standard method for reducing environmental noise emanating from aircraft engine nacelles. To aid in liner testing and development, facilities capable of accurately educing the acoustic impedance in the presence of mean flow analogous to an aircraft engine are required. A facility was built to facilitate novel design approaches and studies into fundamental acoustic liner flow physics.;This thesis details the design, testing, and implementation of the Grazing Flow Impedance Duct (GFID) as an experimental test bench capable of educing the impedance of an acoustic liner. Each component of the facility is discussed detailing the specific features applicable toward the facility as a grazing flow acoustic test bench. Characterization of both the underlying fluid dynamics and acoustics are tested to determine the abilities and inherent limitations associated with the facility. Comparisons are made to similar facilities. Finally, an acoustic liner provided by NASA is tested under grazing flow conditions and the impedance educed by applying the single mode method with favorable results. The thesis ends with an exploratory investigation of the drag impact of an acoustic liner through three indirect velocity profile methods.
机译：隔音衬里仍然是减少飞机发动机机舱发出的环境噪声的标准方法。为了帮助衬里测试和开发，需要能够在类似于飞机发动机的平均流量存在下准确地产生声阻抗的设备。为了便利新颖的设计方法和基础声学衬管流动物理学的研究，建立了一个设施。本论文详细介绍了掠流阻抗管（GFID）的设计，测试和实施，该实验是能够推导管道阻抗的实验性试验台。隔音衬垫。讨论了设施的每个组成部分，详细介绍了适用于该设施作为掠流声学测试台的特定功能。测试基础流体动力学和声学特性，以确定与设施相关的能力和固有限制。对类似设施进行了比较。最后，在掠流条件下测试了由NASA提供的声学衬管，并通过应用单模方法得出的阻抗得到了满意的结果。论文最后通过三种间接速度剖面方法对声学衬垫的阻力进行了探索性研究。

著录项

  • 作者

    Bertolucci, Brandon L.;

  • 作者单位

    University of Florida.;

  • 授予单位 University of Florida.;
  • 学科 Engineering Aerospace.;Physics Acoustics.
  • 学位 Ph.D.
  • 年度 2012
  • 页码 218 p.
  • 总页数 218
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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