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

Peng, Di; Jiao, Lingrui; Yu, Yuelong; Oshio, Tetsuya; Kawakubo, Tomoki; Yakushiji, Akimitsu

doi:10.1007/s00348-017-2416-9

Cited by 42 publications

(16 citation statements)

References 27 publications

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“…Additionally, using short width pulsed excitation light could reduce motion blur in PSP images of moving surface. This method has been successfully used for PSP measurements of turbocharger compressor blades 8 . Figure 2 shows the schematic of the two-gate image acquisition approach in this method.…”

Section: Single-shot Lifetime-based Methodsmentioning

confidence: 99%

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Evaluation and Validation of PSP and TSP Measurement Techniques in Turbomachinery Applications

Li¹,

Peng²,

Liu³

et al. 2019

Proceedings of Global Power &Amp; Propulsion Society

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This work details the development and application of fastresponding pressure-sensitive paint (fast PSP) and temperature-sensitive paint (TSP) for measuring unsteady surface pressure and temperature on fast rotating blades of turbomachinery. Two measurement techniques: phase-lock intensity-based method and single-shot lifetime-based method were first performed on a high-speed fan and the results were evaluated and validated. The single-shot lifetime-based method was found more suitable for measurements of fast rotating blades. Therefore, an experiment using single-shot lifetime-based method was carried out on a turbocharger compressor using the testing facility at Wuxi IHI Turbo (WIT). The pressure distribution on the compressor blades were compared between numerical simulation data and experimental results. The PSP and CFD data showed good agreement in most regions.

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Section: Single-shot Lifetime-based Methodsmentioning

confidence: 99%

“…intensity-based method The data processing procedure of single-shot method was described in detail in Peng et al's work 8,10 . There were four main steps in the current data processing method: coordinate transformation, image deblurring, image registration and temperature correction.…”

Section: Figure 7 Data Processing Procedures Of Phase-lockmentioning

confidence: 99%

Evaluation and Validation of PSP and TSP Measurement Techniques in Turbomachinery Applications

Li¹,

Peng²,

Liu³

et al. 2019

Proceedings of Global Power &Amp; Propulsion Society

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“…For resolving helicopter aerodynamic problems of interest using this self-referencing lifetime-based method, platinum porphyrin (PtTFPP) in polymer/ceramic has been used for the PSP [ 9 ], which has good sensitivity at the cost of a longer lifetime of luminescent emission. Temperature-sensitive paint (TSP) operates using the same principle of luminescence quenching, but due to thermal effects, has also been used on rotor blades in single-shot mode for temperature measurements [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

“…A pixel of the CCD imager that would capture emission from a single finite region on a stationary blade ends up accruing luminescence intensity from several finite regions on the surface as the blade moves. In several studies, longer lifetime PSP is used [ 7 , 11 , 12 ] to improve upon the sensitivity of the pressure measurements, which further exacerbates the blurring problem. Blurring also arises in continuous illumination PSP measurements [ 13 ] where longer exposure times are usually used to improve the signal-to-noise ratio (SNR).…”

Section: Introductionmentioning

confidence: 99%

“…In the comparative study of Pandey et al [ 16 ], it was shown that when working with good luminescent signal levels, both derotation and deblurring methods are equally effective at blur elimination. This technique has been used in single-shot PSP [ 7 , 8 , 11 , 12 ] and TSP measurements [ 12 , 16 ]. The focus of this work is on improving upon the deconvolution-based method for application with sharp pressure gradients such as the identification of the location of a shock on a rotor blade.…”

Section: Introductionmentioning

confidence: 99%

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Iterative Blind Deconvolution Algorithm for Deblurring a Single PSP/TSP Image of Rotating Surfaces

Pandey

Gregory

2018

Sensors

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Imaging of pressure-sensitive paint (PSP) for pressure measurement on moving surfaces is problematic due to the movement of the object within the finite exposure time of the imager, resulting in the blurring of the blade edges. The blurring problem is particularly challenging when high-sensitivity PSP with a long lifetime is used, where the long luminescence time constant of exponential light decay following a burst of excitation light energy results in blurred images. One method to ameliorate this effect is image deconvolution using a point spread function (PSF) based on an estimation of the luminescent time constant. Prior implementations of image deconvolution for PSP deblurring have relied upon a spatially invariant time constant in order to reduce computational time. However, the use of an assumed value of time constant leads to errors in the point spread function, particularly when strong pressure gradients (which cause strong spatial gradients in the decay time constant) are involved. This work introduces an iterative method of image deconvolution, where a spatially variant PSF is used. The point-by-point PSF values are found in an iterative manner, since the time constant depends on the local pressure value, which can only be found from the reduced PSP data. The scheme estimates a super-resolved spatially varying blur kernel with sub-pixel resolution without filtering the blurred image, and then restores the image using classical iterative regularization tools. A kernel-free forward model has been used to generate test images with known pressure surface maps and a varying amount of noise to evaluate the applicability of this scheme in different experimental conditions. A spinning disk setup with a grazing nitrogen jet for producing strong pressure gradients has also been used to evaluate the scheme on a real-world problem. Results including the convergence history and the effect of a regularization-iteration count are shown, along with a comparison with the previous PSP deblurring method.

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An Europium (III) Luminophore with Pressure‐Sensing Units: Effective Back Energy Transfer in Coordination Polymers with Hexadentate Porous Stable Networks

et al. 2020

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A luminescent EuIII coordination polymer with O2‐sensing units under air, EuIII‐hcpt (hcpt: 2,3,6,7,10,11‐hexakis(4‐carboxy‐phenyl)triphenylene), is reported. The hexadentate carboxylic acids in hcpt ligands play an important role in the formation of tight‐packed three‐dimensional networks in EuIII‐hcpt, giving hyper thermo‐stable structures (decomposition temperature=420 °C). The three‐dimensional porous network promotes bright luminescence (4f–4f emission quantum yield=70 %). The emission lifetime of EuIII‐hcpt under vacuum (0.86 ms) was twice as large as that under O2 (0.48 ms, 1 atom:101.3 kPa). The Arrhenius analysis of the emission decay profile indicates that the back energy transfer (BEnT) from the emitting level of the europium(III) ion to the excited T1 state of the hcpt ligand should be activated at room temperature. The gradual decrease of emission lifetime is caused by the BEnT process in EuIII‐hcpt. Finally, an advanced pressure‐sensitive luminophore is demonstrated.

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

Cited by 42 publications

References 27 publications

Evaluation and Validation of PSP and TSP Measurement Techniques in Turbomachinery Applications

Evaluation and Validation of PSP and TSP Measurement Techniques in Turbomachinery Applications

Iterative Blind Deconvolution Algorithm for Deblurring a Single PSP/TSP Image of Rotating Surfaces

An Europium (III) Luminophore with Pressure‐Sensing Units: Effective Back Energy Transfer in Coordination Polymers with Hexadentate Porous Stable Networks

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