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Full Length Article | Open Access

High-speed measurement of thickness of a water film formed by a jet obliquely impinging onto a plate using an LED-induced fluorescence method

Hongzhou ZHANGa,b, Yong HUANGa,b( ), Weiwei YUANa,b, Lu LIa,b
Collaborative Innovation Center of Advanced Aero-Engine, School of Energy and Power Engineering, Beihang University, Beijing 100191, China
National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics, School of Energy and Power Engineering, Beihang University, Beijing 100191, China
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Abstract

A transient thickness distribution measured with a high temporal resolution is elemental for exploring the flow characteristics and mechanism of a liquid film formed by an impinging jet. Therefore, this paper develops a high-speed Light-Emitting Diode-Induced Fluorescence (LEDIF) system based on the brightness measured directly above the liquid film. An Ultraviolet (UV) LED lamp is used to provide sufficient and continuous excitation light. Then, a system performance analysis proves that the system can continuously measure the global film thickness at a high acquisition frequency of 5000 Hz when the dye concentration is 200 mg/L. The influence of the irregularity of the excitation intensity, including the spatial non-uniformity, temporal instability, and long-term instability, on the measurement uncertainty is analyzed in detail. The analysis indicates that the system has an acceptable uncertainty of 10%. Compared with theoretical results, experimental results verify that the LEDIF system can accurately measure the global thickness of a liquid film formed by a water jet obliquely impinging onto a plate. An experimental investigation of the radial section of the raised zone demonstrates that the radial section changes from a sewing needle to an oval when the azimuth angle increases from 10° to 90°. Meanwhile, the dynamic contact angle exponentially decreases from 41.4° to 30.1°. A dynamic analysis of surface waves shows that the measured wave velocity decreases from 12 m/s to 1 m/s and the dominant frequency decreases from 1000 Hz to 10 Hz along the flow direction.

Keywords

Film thicknessLED-induced fluorescenceLiquid filmsHigh-speed measurementPlate impingement jet

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Chinese Journal of Aeronautics
Volume 36 Issue 12,
December 2023
Pages 185-201
DOI: 10.1016/j.cja.2023.07.039
Cite this article:
ZHANG H, HUANG Y, YUAN W, et al. High-speed measurement of thickness of a water film formed by a jet obliquely impinging onto a plate using an LED-induced fluorescence method. Chinese Journal of Aeronautics, 2023, 36(12): 185-201. https://doi.org/10.1016/j.cja.2023.07.039

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Received: 06 December 2022
Revised: 28 December 2022
Accepted: 19 March 2023
Published: 05 August 2023
© 2023 Chinese Society of Aeronautics and Astronautics.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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