Unsteady pressure-sensitive-paint (PSP) measurement in low-speed flow: characteristic mode decomposition and noise floor analysis

2019 ◽  
Vol 60 (7) ◽  
Author(s):  
Yosuke Sugioka ◽  
Kodai Hiura ◽  
Lin Chen ◽  
Akitoshi Matsui ◽  
Kiyoshi Morita ◽  
...  
Keyword(s):  
Flow Characteristic ◽  
Pressure Sensitive Paint ◽  
Characteristic Mode ◽  
Noise Floor ◽  
Low Speed ◽  
Unsteady Pressure ◽  
Pressure Sensitive ◽  
Mode Decomposition ◽  
Speed Flow

Measurement Technique for Unsteady Low-Speed Flow Fields Using Poly(TMSP)-Based Pressure Sensitive Paint

2015 ◽  
Author(s):  
Hideo Mori ◽  
Kyohei Maeda ◽  
Masato Furukawa ◽  
Masao Akiyoshi
Keyword(s):  
Flow Field ◽  
Pressure Variation ◽  
Aerodynamic Noise ◽  
Pressure Sensitivity ◽  
Pressure Sensitive Paint ◽  
Oxygen Quenching ◽  
Low Speed ◽  
Pressure Sensitive ◽  
Speed Flow ◽  
Polymer Type

Nonstationary analysis of flow field is required to detect the source of aerodynamic noise, in order to accomplish the reduction of aerodynamic noise in life environment, including low-frequency noise, which may be harmful for human health. Pressure sensitive paint (PSP) is a quantitative pressure visualization technique on solid surfaces based on oxygen quenching of luminescent molecule. Polymer-type PSP composed of PtTFPP, a luminescent molecule with high oxygen quenching probability, and poly(TMSP), a glassy polymer with high oxygen permeability, has high pressure sensitivity for low-speed flow field. However, the pressure sensitivity of the polymer-type PSP for nonstationary pressure change has not been examined enough. In this study, we investigate the time response of the poly(TMSP)-based PSP, to evaluate the feasibility of the polymer-type PSP as a measurement tool for nonstationary low-speed flows, when the frequency of pressure fluctuation is relatively low. Because response time of polymer-type PSP is proportional to the square of the thickness of the PSP layer, we prepare thinner-layer PSP to increase the response speed by reducing the amount of polymer. The polymer-type PSP is applied to measurement of nonstationary pressure distribution around a circular cylinder in low-speed flow, and compare the amplitude spectra of PSP and that of pressure probe, which are obtained by FFT analysis. As a result it is clarified that the sensitivity of the PSP for pressure variation lower than 100Hz is as high as that for stationary pressure. For pressure variation higher than 100Hz the sensitivity decreases as the frequency of pressure variation increases, but pressure variation with the amplitude of about 300Pa can be detected by the poly(TMSP)-based PSP even if the frequency is as high as 850Hz. Furthermore we have visualized the distribution of the integrated intensity of the PSP amplitude spectrum around the peak, to visualize the area with large pressure variation on the cylinder surface.

scholarly journals Measurement Error and Accuracy Evaluation of Pressure Sensitive Paint Measurement in a Low-speed Flow

2009 ◽  
Vol 29-1 (1) ◽  
pp. 269-269 ◽  
Author(s):  
Daisuke YORITA ◽  
Hiroki NAGAI ◽  
Keisuke ASAI ◽  
Shingo TANAKA ◽  
Keitaro ISHIDA
Keyword(s):  
Measurement Error ◽  
Accuracy Evaluation ◽  
Pressure Sensitive Paint ◽  
Low Speed ◽  
Pressure Sensitive ◽  
Speed Flow

scholarly journals G403 Measurement Technique for Unsteady Low-speed Flow Fields Using Pressure Sensitive Paint

2012 ◽  
Vol 2012 (0) ◽  
pp. 493-494
Author(s):  
Hiroaki Kawabata ◽  
Naoto Omura ◽  
Hideo Mori ◽  
Masato Furukawa ◽  
Masao Akiyoshi ◽  
...  
Keyword(s):  
Measurement Technique ◽  
Flow Fields ◽  
Pressure Sensitive Paint ◽  
Low Speed ◽  
Pressure Sensitive ◽  
Speed Flow

scholarly journals Application of pressure-sensitive paint to low-speed flow around a U-bend of strong curvature

2013 ◽  
Vol 48 ◽  
pp. 58-66 ◽  
Author(s):  
Mark Kenneth Quinn ◽  
Nalleli Gongora-Orozco ◽  
Konstantinos Kontis ◽  
Peter Ireland
Keyword(s):  
Pressure Sensitive Paint ◽  
Low Speed ◽  
Pressure Sensitive ◽  
Speed Flow ◽  
Strong Curvature
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