Measurements in a Turbulent Channel Flow by Means of an LDV Profile Sensor

IF 2.4 3区工程技术 Q3 MECHANICS Flow, Turbulence and Combustion Pub Date : 2023-09-11 DOI:10.1007/s10494-023-00469-4

Saskia Pasch, Robin Leister, Davide Gatti, Ramis Örlü, Bettina Frohnapfel, Jochen Kriegseis

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Abstract

Spatially and temporally resolved velocity measurements in wall-bounded turbulent flows remain a challenge. Contrary to classical laser Doppler velocimetry (LDV) measurements, the laser Doppler velocity profile sensor (LDV-PS) allows the combined measurement of tracer particle position and velocity, which makes it a promising tool. To assess its feasibility a commercial LDV-PS is employed in a turbulent channel flow at \(Re_\tau =350\). Additionally, the measurement and signal-processing accuracies of velocity and location are evaluated for various tracer-object sizes and velocities. On this basis, the turbulent channel flow measurements are evaluated and compared to reference data from direct numerical simulations. Thus, potentials of the LDV-PS are investigated for different regions of the flow and various data processing routines as well as the experimental practice are discussed from an application perspective.

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利用 LDV 剖面传感器测量湍流通道中的流量

在有壁面的湍流中进行时空分辨速度测量仍然是一项挑战。与传统的激光多普勒测速仪（LDV）测量不同，激光多普勒速度剖面传感器（LDV-PS）可以同时测量示踪粒子的位置和速度，因此是一种很有前途的工具。为了评估其可行性，我们在湍流通道流（Re_\tau =350\）中使用了商用 LDV-PS。此外，还对各种示踪物体大小和速度下的速度和位置的测量和信号处理精度进行了评估。在此基础上，对湍流通道流测量进行了评估，并与直接数值模拟的参考数据进行了比较。因此，研究了 LDV-PS 在不同流动区域的潜力，并从应用角度讨论了各种数据处理程序和实验实践。

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来源期刊

Flow, Turbulence and Combustion 工程技术-力学

CiteScore

5.70

自引率

8.30%

发文量

审稿时长

2 months

期刊介绍： Flow, Turbulence and Combustion provides a global forum for the publication of original and innovative research results that contribute to the solution of fundamental and applied problems encountered in single-phase, multi-phase and reacting flows, in both idealized and real systems. The scope of coverage encompasses topics in fluid dynamics, scalar transport, multi-physics interactions and flow control. From time to time the journal publishes Special or Theme Issues featuring invited articles. Contributions may report research that falls within the broad spectrum of analytical, computational and experimental methods. This includes research conducted in academia, industry and a variety of environmental and geophysical sectors. Turbulence, transition and associated phenomena are expected to play a significant role in the majority of studies reported, although non-turbulent flows, typical of those in micro-devices, would be regarded as falling within the scope covered. The emphasis is on originality, timeliness, quality and thematic fit, as exemplified by the title of the journal and the qualifications described above. Relevance to real-world problems and industrial applications are regarded as strengths.