...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of aerospace engineering >Analyzing Interaction Noise from a Small Contra-Rotating Fan Enclosed with Lined and Unlined Casings
【24h】

Analyzing Interaction Noise from a Small Contra-Rotating Fan Enclosed with Lined and Unlined Casings

机译：用衬里和非衬砌壳体封闭的小对立风扇的相互作用噪声分析

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The interaction noise that radiates from ducted contra-rotating (CR) fans are theoretically characterized using Green's analytical functions for lined and unlined circular ducts containing uniform mean flow. The derived models can be used to analyze the spectral characteristics and directivity patterns of noise in various modes. The axial wavenumbers determining modal propagation are treated numerically with the specified boundary conditions. The solved results show that for each cut-on mode, an imaginary part is added to the axial wavenumber, while for the cutoff mode, the already-existing imaginary part is increased. Therefore, it is indicated that both types of modes will attenuate as they propagate along the lined casing, whereas the modes at higher frequencies experience more noise attenuations than those at lower frequencies, which is experimentally verified. Meanwhile, the discrepancy between predicted and experimental results in terms of noise reduction can also be found and is probably due to near-field source modification resulting from the recasting of the tip-clearance flow. Furthermore, the modal directivity patterns of the interaction tone at 2,332 Hz have been investigated. In theory, the lined casing makes the directivity pattern thinner and lean more to the rotation axis than the one with the unlined casing. For both types of casings, the variation trends in experiments are accurately captured by theoretical predictions. The current study is anticipated to improve the understanding of the underlying mechanisms of interaction noise as well as provide an essential reference for devising noise control methods for ducted CR fans.
机译：从管道对抗旋转（CR）风扇辐射的相互作用噪声在理论上是使用含有均匀平均流量的衬里和非衬里圆形管道的绿色分析功能的特征。衍生模型可用于分析各种模式中噪声的光谱特性和方向性模式。确定模态传播的轴向波长与指定的边界条件一起处理。求助结果表明，对于每个切割模式，将假想部分添加到轴向波数，而对于截止模式，已经存在的虚部增加。因此，表明两种类型的模式将在沿着衬里的壳体传播时衰减，而较高频率的模式经验比在实验验证的较低频率下的噪声衰减。同时，也可以发现预测和实验结果之间的差异，并且可能是由于由于尖端间隙的重铸而导致的近场源修改。此外，研究了2,332Hz的相互作用音调的模态指向性模式。在理论上，衬里壳体使方向性图案更薄并更倾斜到旋转轴而不是具有未填充壳体的旋转轴。对于两种类型的肠套，通过理论预测精确地捕获实验中的变化趋势。预计目前的研究是为了改善对互动噪声的潜在机制的理解，并为导管CR风扇的噪声控制方法提供必要的参考。

著录项

  • 来源
    《Journal of aerospace engineering》 |2021年第4期|04021037.1-04021037.11|共11页
  • 作者

    Dong Bin; Yang Dangguo; Wang Chunqi; Fan Changhai;

  • 作者单位

    China Aerodynam Res & Dev Ctr High Speed Aerodynam Inst 6 South Sect 2nd Ring Rd Mianyang 621000 Sichuan Peoples R China|Univ Hong Kong Dept Mech Engn Pokfulam Rd Hong Kong 999077 Peoples R China;

    China Aerodynam Res & Dev Ctr High Speed Aerodynam Inst 6 South Sect 2nd Ring Rd Mianyang 621000 Sichuan Peoples R China;

    Univ Hong Kong Zhejiang Inst Res & Innovat Lab Aerodynam & Acoust Hong Kong 999077 Peoples R China;

    China Aerodynam Res & Dev Ctr High Speed Aerodynam Inst 6 South Sect 2nd Ring Rd Mianyang 621000 Sichuan Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Contra-rotating fan; Interaction noise; Noise attenuation; Modal directivity;

    机译：对抗旋转风扇;相互作用噪声;噪声衰减;模态方向性;

相似文献

  • 外文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号