摘要
PSP(压力敏感涂料)技术在高空间分辨率下的动态压力解析能力受到多因素钳制,其技术迭代亟需可靠的动态数据反馈。基于矩形谐振腔理论设计并构建了一种多频压力发生器,采用频域分析和PSP测压方法对其前5个低频驻波模式下的时空压力进行了数值与实验研究。结果表明声源安装位置会影响矩形谐振腔驻波模式激起的有效性,安装位置位于壁面近顶角处时可完成所有理论驻波模式的激起。实时动态PSP测压主要受到时域噪声的严重干扰,仅能用于定性观察,定量结果可靠性差。基于相位平均的测压结果证明了构建的多频压力发生系统均有效实现了设计频率下驻波模式的激起和对应时空压力的形成,在单声源输入下可产生幅值约为0.8 kPa的时空动态压力。验证了论文所用典型PSP动态测压系统的能力,在频率为1192 Hz动态压力环境中,实现了空间分辨率4测点/mm^(2),测压精度为50 Pa。
The dynamic pressure analysis capability of PSP(pressure sensitive paint)technology at high spatial resolution was constrained by multiple factors.Reliable dynamic data feedback was urgently required for its technological iteration.A multi-frequency pressure generator was designed and constructed based on the theory of rectangulawar resonant cavity.The spatiotemporal pressure of the first five lowfrequency standing wave modes was numerically and experimentally studied using frequency domain analysis and PSP technology.The results showed that the installation position of the sound source could affect the excitation effectiveness of the standing wave mode.All theoretical standing wave modes can be excited while the installation position was located near the top corner of the wall.The real-time dynamic PSP results were severely affected by time-domain noise,resulting in poor reliability of quantitative results.The pressure measurement results based on phase averaging demonstrated that the constructed multi-frequency pressure generation system effectively achieved the excitation of standing wave modes and the formation of corresponding spatiotemporal pressures at the design frequency.Under single sound source input,spatiotemporal dynamic pressure with an amplitude of approximately 0.8 kPa can be generated.The ability of the typical PSP dynamic measurement system was verified,achieving a spatial resolution of 4 points per mm^(2) and a measurement accuracy of 50 Pa in a dynamic pressure environment with a frequency of 1192 Hz.
作者
欧阳波
高丽敏
雷祥福
史航
王磊
OUYANG Bo;GAO Limin;LEI Xiangfu;SHI Hang;WANG Lei(School of Power and Energy,Northwestern Polytechnical University,Xi’an 700129,China)
出处
《航空动力学报》
北大核心
2025年第12期347-357,共11页
Journal of Aerospace Power
基金
国家自然科学基金(92152301,52106053)
稳定支持专项(GJCZ-0000-2024-0012)。
关键词
动态压力
校验系统
矩形谐振腔
高速摄影
空间分辨率
dynamic pressure
verification system
rectangular resonant cavity
high-speed photography
spatial resolution
