Development of Dual-Layer PSP/TSP System for Pressure and Temperature Measurements in Low-Speed Flow Field

2011 ◽  
Author(s):  
Kil-Ju Moon ◽  
Hideo Mori ◽  
Yuichiro Ambe ◽  
Hiroaki Kawabata
Keyword(s):  
Temperature Distribution ◽  
Temperature Compensation ◽  
Optical Filters ◽  
Flow Fields ◽  
Temperature Sensitive ◽  
Low Speed ◽  
Pressure Sensitive ◽  
Speed Flow ◽  
Measurement Tools ◽  
Temperature Sensitive Paint

Pressure sensitive paint (PSP) and temperature sensitive paint (TSP) are useful measurement tools in measurement of pressure and temperature distribution on surfaces in airflows, and application of PSP and TSP in relatively low speed flow fields is highly demanded. However, temperature dependence of PSP will be the factor of an error in the pressure measurement, and therefore the temperature compensation is needed to obtain highly precise pressure distribution. To solve this problem, we apply new combining method. This is made by stacking up a PSP layer and a TSP layer. PSP emission and TSP emission can be separated each other using optical filters. Using this combining method, temperature distribution obtained by the TSP can be used for the temperature compensation of the PSP. In this research we call this combining method as “dual-layer PSP/TSP”. We clarify that the sensitivity of the dual-layer PSP/TSP in low-speed flow fields against pressure and temperature is comparable to that of mono-layer PSP or TSP, showing the feasibility of the dual-layer PSP/TSP for the measurement in low-speed flow fields with the gauge pressure below 1kPa and temperature in the range of 10–20°C (283–293K). We also clarify that, using dual-layer PSP/TSP method, the accuracy of pressure data obtained by PSP increases by compensation of temperature which is obtained by TSP.

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

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.

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