High-frequency pressure fluctuations in vertical jet impingements: fast pressure-sensitive paint analysis

IF 1.7 4区 计算机科学 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Journal of Visualization Pub Date : 2024-08-12 DOI:10.1007/s12650-024-01021-w
Hongling Fan, Chunhua Wei, Jiaxi Zhao, Chen Qin, Haoyuan Zhang, Peng Wang, Huihui Guo
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Abstract

In this paper, a fast-PSP measurement system using the intensity method is constructed to capture the fluctuating pressure field generated by the vertical supersonic (Ma = 1.2) jet impingement on a plate at different impingement distances. The paint formulation is optimized by adding a specific proportion of epoxy resin binder to PC-PSP primer, resulting in no significant peeling even after approximately 100 jet impingements. The light intensity decreased by 12.75% over 35 jet impingements (Ma = 0.7–1.2) without adjusting the light source power. The paint is calibrated and found to have a response time of 83 μs, a pressure sensitivity of 0.5833%/kPa, and a temperature sensitivity of 1.9%/K at 20 °C. The experiment is conducted in an anechoic chamber to investigate the effect of vertical jet impingement on a flat plate with impingement distances (L/d) ranging from 2 to 5. The PSP system captured dynamic pressure signals with a frequency of up to 9212 Hz (L/d = 2). Analysis of the surface pressure distribution in a period showed that an alternating axisymmetrical ring structure is formed in the periphery due to the interaction of expansion and compression waves at the impingement center. The evolving radius of the ring structure over time indicated that its outward expansion speed initially increases and then decreases. The proposed PSP measurement system provides technical assistance for investigating noise mechanisms in close-range vertical jet impingement.

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垂直喷射撞击中的高频压力波动:快速压敏涂料分析
本文构建了一个使用强度法的快速-PSP 测量系统,以捕捉垂直超音速(Ma = 1.2)射流在不同撞击距离下撞击板材所产生的波动压力场。通过在 PC-PSP 底漆中添加特定比例的环氧树脂粘合剂,对涂料配方进行了优化,结果是即使经过约 100 次射流冲击,也没有出现明显的剥落。在不调整光源功率的情况下,经过 35 次喷射撞击(Ma = 0.7-1.2),光强降低了 12.75%。经过校准,发现涂料的响应时间为 83 μs,压力灵敏度为 0.5833%/kPa,20 °C 时的温度灵敏度为 1.9%/K。实验在消声室中进行,研究垂直射流撞击平板的效果,撞击距离(L/d)为 2 至 5。PSP 系统捕获的动态压力信号频率高达 9212 Hz(L/d = 2)。对周期内表面压力分布的分析表明,由于撞击中心的膨胀波和压缩波相互作用,在外围形成了交替的轴对称环形结构。随着时间的推移,环状结构的半径不断变化,表明其向外膨胀的速度先增大后减小。拟议的 PSP 测量系统为研究近距离垂直射流撞击的噪声机理提供了技术帮助。
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来源期刊
Journal of Visualization
Journal of Visualization COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS-IMAGING SCIENCE & PHOTOGRAPHIC TECHNOLOGY
CiteScore
3.40
自引率
5.90%
发文量
79
审稿时长
>12 weeks
期刊介绍: Visualization is an interdisciplinary imaging science devoted to making the invisible visible through the techniques of experimental visualization and computer-aided visualization. The scope of the Journal is to provide a place to exchange information on the latest visualization technology and its application by the presentation of latest papers of both researchers and technicians.
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