Pressure-Sensitive Paint Measurements on a Moving Store in the NRC 1.5 m Blowdown Wind Tunnel

Mébarki, Youssef

doi:10.2514/6.2016-4161

Cited by 5 publications

(1 citation statement)

References 9 publications

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“…When the TSPs are excited by an excitation source with a stable square pulse, such as a pulsed LD or a LED, the luminescence intensity gradually increases and the rise-time can be easily evaluated. The luminescence intensity is captured for both the rise process and the decay process and the temperature is evaluated using the ratio of these intensities [178]. Although the measurement time becomes long, the temperature sensitivity and the measurement accuracy are high using these methods [179].…”

Section: Lifetime Based Methodsmentioning

confidence: 99%

Particle-based temperature measurement coupled with velocity measurement

Someya

2020

Meas. Sci. Technol.

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This review article focuses on the simultaneous particle-based measurement of velocity and temperature. The thermographic PIV with phosphor particles is included in the scope. However, there are many other dye-doped particles that can be used in these methods, some of which are more suitable for measurements of liquid flow and low temperature flow.This review summarized the methods for fabrication, applications, optical properties, and limitations of temperature sensitive particles, and the extensive coverage of the field provided by this review renders it useful as a base for further experimentation. Dopant sensor molecules are also summarized in this review make it possible to fabricate functional particles that are suitable for the aims of an individual researcher. These particles are excited by a UV-laser and several kinds of them can be excited using a common green laser.Several approaches to velocity and temperature measurements, mono-color intensity-based method, the ratiometric method and the lifetime method are explained. The combined methods are limited by velocity conditions; therefore, decoupling the temperature measurement from the velocity measurement is sometimes reasonable. However, combined measurements were also considered in this review.There are many possible sources of error when using these methods; however, the most important factor is the following capacity of the particles, especially in gaseous flow. The deformation of particle images because of the long exposure inherent in the lifetime-based method was discussed quantitatively.Applications of liquid/gas/multiphase flow measurements were introduced. Micro capsules or microbeads are often used for a liquid flow and a microchannel flow. Many previous works use a phosphor for a high temperature gas flow. Uncertainties are different on a case-by-case basis. Accurate calibration is very important in suppressing errors. The development of easy calibration methods or calibration free methods while retaining high accuracy is an important issue in future work.

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Section: Lifetime Based Methodsmentioning

confidence: 99%

Particle-based temperature measurement coupled with velocity measurement

Someya

2020

Meas. Sci. Technol.

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Applications of PSP

Liu

Sullivan

Asai

et al. 2021

Experimental Fluid Mechanics

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Single-shot pressure-sensitive paint lifetime measurements on fast rotating blades using an optimized double-shutter technique

et al. 2017

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A pressure-sensitive paint (PSP) system is presented to measure global surface pressures on fast rotating blades. It is dedicated to solve the problem of blurred image data employing the single-shot lifetime method. The efficient blur reduction capability of an optimized double shutter imaging technique is demonstrated omitting error-prone post-processing or laborious de-rotation setups. The system is applied on Mach-scaled DSA-9A helicopter blades in climb at various collective pitch settings and blade tip Mach-and chord Reynolds numbers (M tip = 0.29−0.57; Re tip = 4.63− 9.26 • 10 5). Temperature effects in the PSP are corrected by a theoretical approximation validated against measured temperatures using temperature-sensitive paint (TSP) on a separate blade. Ensemble averaged PSP-results are comparable to pressure-tap data on the same blade to within 250 Pa. Resulting pressure maps on the blade suction side reveal spatially high resolved flow features such as the leading edge suction peak, footprints of blade-tip vortices and evidence of laminar-turbulent boundary-layer (BL) transition. The findings are validated by a separately conducted BL transition measurement by means of TSP and numerical simulations using a 2D coupled Euler/boundary-layer code. Moreover, the principal ability of the single-shot technique to capture unsteady flow phenomena is stressed revealing three-dimensional pressure fluctuations at stall.

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Pressure-Sensitive Paint Measurements on a Moving Store in the NRC 1.5 m Blowdown Wind Tunnel

Cited by 5 publications

References 9 publications

Particle-based temperature measurement coupled with velocity measurement

Particle-based temperature measurement coupled with velocity measurement

Applications of PSP

Single-shot pressure-sensitive paint lifetime measurements on fast rotating blades using an optimized double-shutter technique

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