Study on MHz high-speed PIV technique

LU Xintao; ZHAO Hang; SHE Wenxuan; TU Han; GAO Qi; WEI Runjie; ZHANG Fang; Chen Shuang

doi:10.11729/syltlx20230144

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LU X T, ZHAO H, SHE W X, et al. Study on MHz high-speed PIV technique[J]. Journal of Experiments in Fluid Mechanics, doi: 10.11729/syltlx20230144.

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LU X T, ZHAO H, SHE W X, et al. Study on MHz high-speed PIV technique[J]. Journal of Experiments in Fluid Mechanics, doi: 10.11729/syltlx20230144.

Citation:

LU X T, ZHAO H, SHE W X, et al. Study on MHz high-speed PIV technique[J]. Journal of Experiments in Fluid Mechanics, doi: 10.11729/syltlx20230144.

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Study on MHz high-speed PIV technique

LU Xintao^1,,
ZHAO Hang¹,
SHE Wenxuan¹,
TU Han^{2, 1},
GAO Qi^1, ,,
WEI Runjie³,
ZHANG Fang⁴,
Chen Shuang⁵

1.
School of Aeronautics and Astronautics, Zhejiang University, Hangzhou　310027, China
2.
School of Mechanical & Electrical Engineering, Wuhan Institute of Technology, Wuhan　430205, China
3.
MicroVec. Inc., Beijing　100083, China
4.
Beamtech Optronics Co., Ltd, Beijing　102209, China
5.
Facility Design and Instrumentation Institute, China Aerodynamics Research and Development Center, Mianyang　621000, China

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Received Date: October 30, 2023
Revised Date: December 11, 2023
Accepted Date: December 18, 2023
Available Online: January 08, 2024

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Abstract

Abstract

Transonic flows have presented an enduring challenge to experimental research due to their intricate and unsteady flow characteristics. This study investigated the megahertz-frequency Particle Image Velocimetry（MHz–PIV）technique to enhance the resolution of small time-scale flows under the transonic flow conditions. During the measurement, five high-speed cameras alternately and quickly captured images of the same measurement area, and thus obtained ultra-high time resolution particle image data. By employing image processing techniques optical distortion correction and identification of the common area were achieved. The application of the ensemble correlation algorithm, coupled with spectral analysis of the compressible turbulent flow field based on the velocity field, contributed to a comprehensive analysis. The experiment validated the high-frequency sampling capability of MHz–PIV, which significantly reduces the technology’s dependence on camera performance. This approach offers a refined measurement technique with high spatiotemporal resolution for transonic experiments.
- transonic,
- particle image velocimetry,
- spatiotemporal resolution,
- image processing,
- turbulent power spectrum

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References

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