Measurement of fully-developed turbulent pipe flow with digital particle image velocimetry
Measurement of fully-developed turbulent pipe flow with digital particle image velocimetry
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DOI：
10.1007/bf00190272
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发表时间：
1996
影响因子：
2.4
通讯作者：
J. Westerweel;A. Draad;J. V. D. Hoeven;J. Oord
中科院分区：
文献类型：
--
作者：
J. Westerweel;A. Draad;J. V. D. Hoeven;J. Oord
本文介绍了一种新型的高分辨率数字粒子图像测速（DPIV）图像采集系统，用于雷诺数为5300的充分发展的湍流管道流动的测量。管流的流动条件与直接数值模拟（DNS）的流动条件和常规测量（即，摄影）PIV和激光多普勒测速仪（LDV）。该实验允许对非平凡非定常流的PIV方法的常规和数字实现进行直接和详细的比较。湍流统计和功率谱的结果表明，DPIV的精度水平与传统PIV相当，尽管在询问像素分辨率上有相当大的差异，即32 × 32（DPIV）与256 × 256（PIV）。这一结果与早期的测量精度分析预测一致。与传统PIV相比，DPIV的优点之一是DPIV图像的询问仅花费PIV照片询问所需时间的一小部分。
A new and unique high-resolution image acquisition system for digital particle image velocimetry (DPIV) in turbulent flows is used for the measurement of fully-developed turbulent pipe flow at a Reynolds number of 5300. The flow conditions of the pipe flow match those of a direct numerical simulation (DNS) and of measurements with conventional (viz., photographic) PIV and with laser-Doppler velocimetry (LDV). This experiment allows a direct and detailed comparison of the conventional and digital implementations of the PIV method for a non-trivial unsteady flow. The results for the turbulence statistics and power spectra show that the level of accuracy for DPIV is comparable to that of conventional PIV, despite a considerable difference in the interrogation pixel resolution, i.e. 32 × 32 (DPIV) versus 256 × 256 (PIV). This result is in agreement with an earlier analytical prediction for the measurement accuracy. One of the advantages of DPIV over conventional PIV is that the interrogation of the DPIV images takes only a fraction of the time needed for the interrogation of the PIV photographs.