Unsteady Pressure Measurement on Oscillating Blade in Transonic Flow Using Fast-Response Pressure-Sensitive Paint

A fast-response pressure-sensitive paint (PSP) technique was applied to the measurement of unsteady surface pressure of an oscillating cascade blade in a transonic flow. A linear cascade was used, and its central blade was oscillated in a translational manner. The unsteady pressure distributions of the oscillating blade and two stationary neighbors were measured using the fast-response PSP technique, and the unsteady aerodynamic force on the blade was obtained by integrating the data obtained on the pressures. The measurements made with the PSP technique were compared with those obtained by conventional methods for the purpose of validation. From the results, the PSP technique was revealed to be capable of measuring the unsteady surface pressure, which is used for flutter analysis in transonic conditions.

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On High-Resolution Pressure Amplitude and Phase Measurements Comparing Fast-Response Pressure Transducers and Unsteady Pressure-Sensitive Paint

Volume 2E: Turbomachinery ◽

10.1115/gt2020-16194 ◽

2020 ◽

Author(s):

Martin Bitter ◽

Stephan Stotz ◽

Reinhard Niehuis

Keyword(s):

Fast Response ◽

Pressure Amplitude ◽

Pressure Sensitive Paint ◽

Simultaneous Application ◽

Pressure Transducers ◽

Unsteady Pressure ◽

Flow Sensing ◽

Pressure Sensitive ◽

Perturbation Frequency ◽

Response Pressure

Abstract This paper presents the simultaneous application of fast-response pressure transducers and unsteady pressure-sensitive paint (unsteady PSP) for the precise determination of pressure amplitudes and phases up to 3,000 Hz. These experiments have been carried out on a low-pressure turbine blade cascade under engine-relevant conditions (Re, Ma, Tu) in the High-Speed Cascade Wind Tunnel. Periodic blade/vane interactions were simulated at the inlet to the cascade using a wake generator operating at a constant perturbation frequency of 500 Hz. The main goal of this paper is the detailed comparison of amplitude and phase distributions between both flow sensing techniques at least up to the second harmonic of the wake generator’s fundamental perturbation frequency (i.e. 1,000 Hz). Therefore, a careful assessment of the key drivers for relative deviations between measurement results as well as a detailed discussion of the data processing is presented for both measurement techniques. This discussion outlines the mandatory steps which were essential to achieve the quality as presented down to pressure amplitudes of several pascal even under challenging experimental conditions. Apart from the remarkable consistency of the results, this paper reveals the potential of (unsteady) PSP as a future key flow sensing technique in turbomachinery research, especially for cascade testing. The results demonstrate that PSP was able to successfully sense pressure dynamics with very low fluctuation amplitudes down to 8 Pa.

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Investigation of Cavity Flow Using Fast-Response Pressure-Sensitive Paint

AIAA Journal ◽

10.2514/1.j052864 ◽

2014 ◽

Vol 52 (11) ◽

pp. 2462-2470 ◽

Cited By ~ 26

Author(s):

W. Flaherty ◽

Todd M. Reedy ◽

Gregory S. Elliott ◽

J. M. Austin ◽

Ryan F. Schmit ◽

...

Keyword(s):

Cavity Flow ◽

Fast Response ◽

Pressure Sensitive Paint ◽

Pressure Sensitive ◽

Response Pressure

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Unsteady 2-D film-cooling effectiveness behind a single row of holes at different blowing ratios: Measurements using fast-response pressure-sensitive paint

International Journal of Heat and Mass Transfer ◽

10.1016/j.ijheatmasstransfer.2017.12.141 ◽

2018 ◽

Vol 120 ◽

pp. 1325-1340 ◽

Cited By ~ 4

Author(s):

Tao Cai ◽

Di Peng ◽

Savas Yavuzkurt ◽

Ying Zheng Liu

Keyword(s):

Film Cooling ◽

Fast Response ◽

Pressure Sensitive Paint ◽

Cooling Effectiveness ◽

Film Cooling Effectiveness ◽

Single Row ◽

Pressure Sensitive ◽

Response Pressure

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Development of a Pressure-Sensitive Coating Using Platinum Octaethylporphyrin

Coatings ◽

10.3390/coatings11091093 ◽

2021 ◽

Vol 11 (9) ◽

pp. 1093

Author(s):

George Catalin Cristea ◽

Sorina Ilina ◽

George Pelin ◽

Adriana Stefan ◽

Cristina Elisabeta Pelin

Keyword(s):

High Resolution ◽

Surface Pressure ◽

Measurement Technique ◽

New Method ◽

Optical Technique ◽

Pressure Sensitive Paint ◽

Image Capture ◽

Pressure Distributions ◽

Pressure Sensitive ◽

Sensitive Coating

In recent years, researchers have developed a new method of measuring the pressure on the surface using sensitive paints. This is an optical technique for determining surface pressure distributions by measuring changes in the intensity, emitted by certain excited molecules. The main advantage of the method over traditional techniques is the high resolution of the information. The only limitation of the resolution of a global map generated by the PSP (pressure-sensitive paint) technique is given by the capabilities of the image capture device. This paper describes the development of a technology for obtaining pressure-sensitive paint, in laboratory conditions, as an advanced measurement technique. The method has an application in many fields such as automotive, aerospace, or even medical.

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