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Single-shot lifetime-based PSP and TSP measurements on turbocharger compressor blades

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Abstract

Fast-responding pressure-sensitive paint (Fast PSP) and temperature-sensitive paint (TSP) measurements were conducted on two turbocharger compressors using a single-shot lifetime-based technique. The fast PSP and TSP were applied on separate blades of one compressor, and both paints were excited by a pulsed 532 nm Nd:YAG laser. The luminescent decay signals following the laser pulse were recorded by a CCD camera in a double-exposure mode. Instantaneous pressure and temperature fields on compressor blades were obtained simultaneously, for rotation speeds up to 150,000 rpm. The variations in pressure and temperature fields with rotation speed, flow rate and runtime were clearly visualized, showing the advantage of high spatial resolution. Severe image blurring problems and significant temperature-induced errors in the PSP results were found at high rotation speeds. The first issue was addressed by incorporating a deconvolution-based deblurring algorithm to recover the clear image from the blurred image using the combination of luminescent lifetime and rotation speed. The second issue was resolved by applying a pixel-by-pixel temperature correction based on the TSP results. The current technique has shown great capabilities in flow diagnostics of turbomachinery and can serve as a powerful tool for CFD validations and design optimizations.

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Abbreviations

I :

Intensity

I 0 :

Intensity at the beginning of luminescent decay

I 1 :

Intensity of gate 1

I 2 :

Intensity of gate 2

I PSP :

Intensity of PSP

I PSP_ref :

Intensity of PSP at reference condition

I TSP :

Intensity of TSP

I TSP_ref :

Intensity of TSP at reference condition

I ref :

Intensity at reference condition

k :

Ratio of temperature sensitivity between PSP and TSP

n :

Rotation speed

P :

Pressure

P ref :

Pressure at reference condition

Q :

Flow rate

Q ref :

Flow rate at reference condition

T :

Temperature

T ref :

Temperature at reference condition

t :

Time

V tip :

Compressor tip speed

x :

Coordinate in streamwise direction

ΔP :

Pressure difference on separate blades measured by PSP

ΔT :

Temperature change

Δt :

Time duration of image blur

Δθ :

Angular displacement during image blur

θ :

Circumferential angle

θ 0 :

Circumferential angle range occupied by one blade

τ :

Luminescent lifetime

τ ref :

Luminescent lifetime at reference condition

ω :

Angular velocity

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Acknowledgements

This work was supported by funding from the IHI Corporation, the National Natural Science Foundation of China (NSFC No. 11502144) and the Gas Turbine Research Institute of Shanghai Jiao Tong University. The authors greatly appreciate the assistance from Mr. Chunhua Cao, Mr. Xinhua Cao and other staff members of WIT during the turbocharger tests.

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Authors and Affiliations

  1. Gas Turbine Research Institute/School of Mechanical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Rd, Shanghai, 200240, China

    Di Peng, Lingrui Jiao, Yuelong Yu & Yingzheng Liu

  2. Product Development Center, IHI Corporation, 1 Shin-nakahara-cho, Yokohama, 235-8501, Japan

    Tetsuya Oshio & Tomoki Kawakubo

  3. Technology Department, Wuxi IHI Turbo, 110 Meiyu Rd, Wuxi, 214028, China

    Akimitsu Yakushiji

Authors
  1. Di Peng
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  2. Lingrui Jiao
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  3. Yuelong Yu
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  4. Yingzheng Liu
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  5. Tetsuya Oshio
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  6. Tomoki Kawakubo
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  7. Akimitsu Yakushiji
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Correspondence to Yingzheng Liu.

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Peng, D., Jiao, L., Yu, Y. et al. Single-shot lifetime-based PSP and TSP measurements on turbocharger compressor blades. Exp Fluids 58, 127 (2017). https://doi.org/10.1007/s00348-017-2416-9

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