A Particle Image Velocimetry-Based Investigation of the Flow Field in an Oblique Jet Impingement Configuration
A Particle Image Velocimetry-Based Investigation of the Flow Field in an Oblique Jet Impingement Configuration
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DOI：
10.1115/1.4025212
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发表时间：
2013-06
影响因子：
1.7
通讯作者：
S. Schulz;Simon Schueren;J. Wolfersdorf
中科院分区：
文献类型：
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作者：
S. Schulz;Simon Schueren;J. Wolfersdorf
在燃气涡轮机技术中，冲击射流已经成为冷却应用中不可缺少的措施。本研究旨在揭示一个与发动机相关的梯形截面冷却通道内的流场动力学。所研究的几何形状产生了一个高度复杂的流场，采用粒子图像测速（PIV）进行了研究。实验同时进行了数值模拟，采用低Re k-ω-SST湍流模型，利用FLUENT求解RANS方程。此外，使用Kulite压力传感器进行时间分辨压力测量。瞬态压力信号的频谱分析结合适当的正交分解（POD）分析的PIV数据允许详细了解几何约束的影响，对内部的流体动力学过程的geometris.The结果的射流雷诺数为45，000，并显示定性公平的实验和数值模拟之间的协议。然而，模拟预测的流动特征，在特定区域的几何形状，是在实验中不存在的。尽管缺乏明显的高能量模式，该流动非常适合POD分析。根据所考虑的PIV平面，可以表明，流场总湍流能量的25%包含在前十个POD模式中。此外，使用前20到60个POD模式足以重建具有其控制特征的流场。Copyright © 2013 by ASME
Impinging jets have become an indispensable measure for cooling applications in gas turbine technology. The present study seeks to unfold the flow field dynamics inside an enigine-relevant cooling passage of trapezoidal cross-section. The investigated geometry produces a highly complex flow field which was investigated employing Particle Image Velocimetry (PIV). The experiments were accompanied by numerical simulations solving the RANS equations with FLUENT using the low-Re k-ω-SST turbulence model. Additionally, time-resolved pressure measurements were performed utilizing Kulite pressure transducers. The spectral analysis of the transient pressure signal in conjunction with a Proper Orthogonal Decomposition (POD) analysis of the PIV data allows a detailed insight into the effects of geometric constraints on the fluid dynamic processes inside the geometry.The results are presented for a jet Reynolds number of 45,000 and display a qualitatively fair agreement between the experiments and numerical simulations. Nevertheless, the simulations predict flow features in particular regions of the geometry that are absent in the experiments. Despite the lack of conspicuous high energy modes, the flow was well suited for a POD analysis. Depending on the considered PIV plane, it could be shown that up to 25% of the flow field’s total turbulent energy are contained in the first ten POD modes. Additionally, using the first 20 to 60 POD modes sufficed to reconstruct the flow fields with its governing features.Copyright © 2013 by ASME