用压敏涂料测量支撑方形圆柱体后平面上的压力波动分布

IF 2.8 2区 工程技术 Q2 ENGINEERING, MECHANICAL
Akitoshi Matsui , Chiaki Kawase , Yosuke Sugioka , Keisuke Asai , Taku Nonomura
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引用次数: 0

摘要

利用压敏涂料(PSP)测量了湍流边界层中支撑方形圆柱体后地板表面的压力波动分布。具体而言,研究了马赫数 M = 0.3 左右时 PSP 的精度和频率响应。研究了同一湍流边界层中四个不同尺寸的方形圆柱体,并讨论了这些条件与卡尔曼涡流脱落结构之间的详细关系。用 PSP 测得的数值与用压力传感器在高达 5 kHz 的频率下测得的数值具有相似的趋势。在频率大于 3 kHz 时,可观测到卡曼涡流脱落引起的压力波动的峰值功率谱密度 (PSD),误差约为 30%。此外,还发现卡曼涡流脱落的峰值频率随气缸高度的增加而降低,其方式与之前的斯特劳哈尔数经验公式相似。最短方形圆柱体(h/w = 3.5,h/δ = 1.1)的 PSD 峰值是其他圆柱体的两倍;而且,这种情况下的高压波动区域没有向下游扩散,这表明来自圆柱体顶部的气流影响了圆柱体侧面产生的卡曼涡流脱落。通过右奇异矢量 vi 在卡尔曼涡旋频率上提取的最高 PSD 的两个主要模式的一个轮廓在支撑较高的方形圆柱体后面呈不对称分布(h/w ≥ 7.0,h/δ ≥ 2.3)。这一结果被认为是由于卡曼涡旋脱落主要产生于主流而非边界层流动。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Measurement of pressure fluctuation distribution on a flat wall behind supported square cylinder with pressure-sensitive paint

The pressure fluctuation distribution on the floor surface behind a supported square cylinder in a turbulent boundary layer was measured by using pressure-sensitive paint (PSP). Specifically, the accuracy and frequency response of PSP at a Mach number around M = 0.3 were examined. Four square cylinders with different dimensions were investigated in the same turbulent boundary layer, and the detailed relationship between these conditions and Kármán vortex shedding structures was discussed. The values measured with PSP had a similar trend to those measured with a pressure transducer at up to 5 kHz. The peak power spectral density (PSD) of the pressure fluctuations due to Kármán vortex shedding was observed within an error of approximately 30 % at up to frequencies greater than 3 kHz. Moreover, the peak frequency of Kármán vortex shedding was found to decrease with the cylinder height in a manner similar to a previous empirical equation for the Strouhal number. The peak PSD value for the shortest square cylinder (h/w = 3.5, h/δ = 1.1) was twice as high as that for the other cylinders; also, the high-pressure fluctuation area in this case did not spread downstream, which suggests that the flow from the top of the cylinder affected the Kármán vortex shedding generated from the cylinder’s sides. One contour of the two main modes extracted for the highest PSD via the right singular vector vi at the Kármán vortex frequency had an asymmetric distribution behind the supported taller square cylinders (h/w ≥ 7.0, h/δ ≥ 2.3). This result is considered to be derived from the Kármán vortex shedding being mainly generated from the mainstream rather than the boundary-layer flow.

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来源期刊
Experimental Thermal and Fluid Science
Experimental Thermal and Fluid Science 工程技术-工程:机械
CiteScore
6.70
自引率
3.10%
发文量
159
审稿时长
34 days
期刊介绍: Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.
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