Abstract
The evolution of pressure-sensitive paint (PSP)-based surface pressure measurement technology for rotating machinery is significant for flow mechanism analysis and blade design. Considering the challenges of reducing motion blur and improving signal-to-noise ratio (SNR) in the application of PSP technology for the rotating machinery, an accumulated imaging method with phase-locking based on the periodic characteristics of the rotor flow field has been proposed in this study, which is capable of capturing the phase-averaging pressure on the rotor blade surface. The motion blur is reduced by pulse acquisition of PSP luminescent, and the SNR is improved by accumulating luminescent signals of the same phase multiple times, which can address the challenge. Single PSP luminescence acquisition time and accumulation number are the two most crucial parameters for measurement accuracy, and the constraints of the parameters are discussed in detail according to the principle of PSP. The PSP measurement system for rotating machinery based on the proposed method has been established, and the method is successfully applied to the rotating blade surface pressure measurement of a transonic axial fan. Besides, the proposed method can also be applied to the temperature measurement of the rotating blades based on temperature-sensitive paint. The results offer a technical foundation for the pressure measurement of rotating machinery.
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Data availability
The data generated and/or analyzed during the current study are not publicly available for legal/ethical reasons but are available from the corresponding author on reasonable request.
Abbreviations
- A, B :
-
Stern–Volmer coefficient
- d :
-
Image blur length
- D :
-
Blade movement distance during the exposure time
- D max :
-
Motion blur tolerance
- f :
-
Luminescence intensity per unit time
- I :
-
Luminescence intensity (counts)
- j, k :
-
Pixel coordinates
- n :
-
Rotating speed
- N :
-
Number of accumulations
- P :
-
Pressure
- q :
-
Spatial resolution
- \(r\) :
-
Radius
- \(t_{{\text{T}}}\) :
-
Total time of PSP luminescence acquisition
- \(t_{{{\text{PSP}}}}\) :
-
Single PSP luminescence acquisition time
- \(\omega\) :
-
Angular velocity
- \(\theta\) :
-
A phase of the rotor
- R:
-
Rotating condition
- tested:
-
Measured condition
- ref:
-
Reference condition
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Acknowledgements
The authors express their sincere gratitude to the Institute of Chemistry at the Chinese Academy of Sciences, for providing the pressure-sensitive paint used in this study. The study is co-supported by the National Natural Science Foundation of China [grant number 51790512, 52106053], the foundation of National Key Laboratory of Science and Technology on Aerodynamic Design and Research [No.614220121050309], Young Talent fund of University Association for Science and Technology in Shaanxi [No.20220404], and MIIT.
Funding
The research leading to these results received funding from the National Natural Science Foundation of China [grant number 51790512, 52106053], the foundation of National Key Laboratory of Science and Technology on Aerodynamic Design and Research [No.614220121050309], Young Talent fund of University Association for Science and Technology in Shaanxi [No.20220404], and MIIT.
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L. G. contributed to conceptualization and supervision; R. L. and N. G. analysed the results, wrote the original draft and prepared all figures; N. G., L. W. and O. B. contributed to the experiments and produced the results. All authors reviewed the manuscript. Both Limin Gao and Ruiyu Li are the corresponding authors.
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Ge, N., Li, R., Gao, L. et al. An accumulated imaging method with phase-locking for rotor pressure-sensitive paint measurements. Exp Fluids 64, 113 (2023). https://doi.org/10.1007/s00348-023-03653-4
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DOI: https://doi.org/10.1007/s00348-023-03653-4