{"title":"Time-resolved phase-lock pressure-sensitive paint measurement of trailing edge noise dynamics","authors":"Masato Imai, Kohei Konishi, Keita Ogura, Kazuyuki Nakakita, Masaharu Kameda","doi":"10.1007/s00348-024-03838-5","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Pressure-sensitive paint (PSP) was applied to the surface of a NACA0012 airfoil to investigate pressure fluctuations associated with trailing edge (TE) noise under low-velocity flow conditions. The primary focus is to assess the feasibility of employing laser pulses exposed at the airfoil surface to mitigate TE noise. However, the weak pressure fluctuations accompanying TE noise pose a challenge, as they are overshadowed by image sensor noise in high-speed cameras capturing PSP emission changes. To address this issue, a novel time-resolved phase-locking technique was introduced, utilizing the signal from a semiconductor pressure transducer at the trailing edge as a phase-lock trigger source. By repetitively conducting phase-locked measurements (1150 times), time series ensemble averaged data based on PSP emission images were obtained, enabling the capture of these subtle pressure fluctuations. Quantitatively, fluctuations with a dominant frequency of 679 Hz and an amplitude of 50 Pa are resolved within an accuracy of about 15 Pa, achieved at a recording rate of 19.2 kHz. Both the suppression and subsequent redevelopment of the pressure field with the TE noise offer valuable insights into the dynamics of TE noise and open avenues for targeted noise reduction strategies in aerodynamic applications.</p><h3 data-test=\"abstract-sub-heading\">Graphic abstract</h3>","PeriodicalId":554,"journal":{"name":"Experiments in Fluids","volume":null,"pages":null},"PeriodicalIF":2.3000,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Experiments in Fluids","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1007/s00348-024-03838-5","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Pressure-sensitive paint (PSP) was applied to the surface of a NACA0012 airfoil to investigate pressure fluctuations associated with trailing edge (TE) noise under low-velocity flow conditions. The primary focus is to assess the feasibility of employing laser pulses exposed at the airfoil surface to mitigate TE noise. However, the weak pressure fluctuations accompanying TE noise pose a challenge, as they are overshadowed by image sensor noise in high-speed cameras capturing PSP emission changes. To address this issue, a novel time-resolved phase-locking technique was introduced, utilizing the signal from a semiconductor pressure transducer at the trailing edge as a phase-lock trigger source. By repetitively conducting phase-locked measurements (1150 times), time series ensemble averaged data based on PSP emission images were obtained, enabling the capture of these subtle pressure fluctuations. Quantitatively, fluctuations with a dominant frequency of 679 Hz and an amplitude of 50 Pa are resolved within an accuracy of about 15 Pa, achieved at a recording rate of 19.2 kHz. Both the suppression and subsequent redevelopment of the pressure field with the TE noise offer valuable insights into the dynamics of TE noise and open avenues for targeted noise reduction strategies in aerodynamic applications.
摘要 在 NACA0012 机翼表面涂上压敏涂料（PSP），以研究低速流动条件下与后缘（TE）噪声相关的压力波动。主要重点是评估采用暴露在机翼表面的激光脉冲来减轻 TE 噪音的可行性。然而，伴随 TE 噪声的微弱压力波动带来了挑战，因为它们被高速相机捕捉 PSP 发射变化时的图像传感器噪声所掩盖。为了解决这个问题，我们引入了一种新颖的时间分辨锁相技术，利用后缘半导体压力传感器的信号作为锁相触发源。通过重复进行锁相测量（1150 次），获得了基于 PSP 发射图像的时间序列集合平均数据，从而捕捉到了这些微妙的压力波动。从定量角度看，主频为 679 Hz、振幅为 50 Pa 的波动，在 19.2 kHz 的记录速率下，可在约 15 Pa 的范围内精确分辨。压力场与 TE 噪声的抑制和随后的再发展为 TE 噪声的动力学提供了宝贵的见解，并为在空气动力学应用中采取有针对性的降噪策略开辟了途径。
期刊介绍：
Experiments in Fluids examines the advancement, extension, and improvement of new techniques of flow measurement. The journal also publishes contributions that employ existing experimental techniques to gain an understanding of the underlying flow physics in the areas of turbulence, aerodynamics, hydrodynamics, convective heat transfer, combustion, turbomachinery, multi-phase flows, and chemical, biological and geological flows. In addition, readers will find papers that report on investigations combining experimental and analytical/numerical approaches.
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