尾缘噪声动力学的时间分辨锁相压敏漆测量
Time-resolved phase-lock pressure-sensitive paint measurement of trailing edge noise dynamics
AI总结：
本文提出时间分辨锁相PSP测量技术，以解决微弱尾缘噪声压力脉动被传感器噪声掩盖的问题，在NACA0012翼型上实现了679 Hz、50 Pa脉动的高精度分辨，并揭示了尾缘噪声的抑制与再发展动力学。
摘要：
压敏漆（PSP）被应用于NACA0012翼型表面，以研究低速流动条件下与尾缘（TE）噪声相关的压力脉动。主要目标是评估利用照射在翼型表面的激光脉冲来抑制TE噪声的可行性。然而，伴随TE噪声的微弱压力脉动构成了一个挑战，因为它们在捕捉PSP发光变化的高速相机中会被图像传感器噪声所掩盖。为解决这一问题，引入了一种新颖的时间分辨锁相技术，利用尾缘处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发光图像的时间序列系综平均数据，从而能够捕捉这些微弱的压力脉动。定量而言，在19.2 kHz的记录速率下，主频为679 Hz、振幅为50 Pa的脉动被分辨出来，精度约为15 Pa。压力场随TE噪声的抑制及其后续重新发展，为理解TE噪声动力学提供了有价值的见解，并为空气动力学应用中的定向降噪策略开辟了途径。
英文摘要：
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. A novel time-resolved phase-locking technique was introduced to address this issue, 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.
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