Integrated Optical Measurement Techniques for Investigation of Fluid-Structure Interactions

Gregory, James W.; Kumar, P. K. Vinod; Peng, Di; Fonov, Sergey; Crafton, Jim; Liu, Tianshu

doi:10.2514/6.2009-4044

Cited by 26 publications

(13 citation statements)

References 9 publications

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“…They are subsequently recorded during the so-called "integration gates" G1 and G2. If both frames are acquired from a single excitation pulse, the method is referred to as the "single-shot lifetime technique" (Gregory et al, 2009;Juliano et al, 2011). With this approach any uncertainty originating from inhomogeneous or unstable pulsed excitation light is eliminated as the resulting pattern is the same in both images used for division.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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“…Gregory et al 6 proposed a single-shot lifetime-based PSP technique. In this method a pulsed laser was used to excite PSP coating.…”

Section: Single-shot Lifetime-based Methodsmentioning

confidence: 99%

“…A main challenge to conducted PSP/TSP techniques to fast rotating surface is developing a proper image acquisition system to record high quality PSP/TSP emission signals. In previous study, phase-lock method 4,5 and single shot method 6,7 were adopted by several researchers for measurements of rotating surfaces. However, these two methods were still not fully compared and evaluated in previous studies.…”

Section: Introductionmentioning

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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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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“…used the lifetime-based single-shot PSP technique to study a rotor blade and an airfoil in an oscillating freestream. 19 Kumar also demonstrated the surface pressure measurements on rotating surfaces with unsteady pressure fluctuations using the lifetime-based singleshot methods. 20 Chapter 3 : PSP Characterization for Large-Scale Wind Tunnel Test…”

Section: Manymentioning

confidence: 97%

Application of fast-responding pressure-sensitive paint to a hemispherical dome in unsteady transonic flow

et al. 2010

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Integrated Optical Measurement Techniques for Investigation of Fluid-Structure Interactions

Cited by 26 publications

References 9 publications

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

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

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

Application of fast-responding pressure-sensitive paint to a hemispherical dome in unsteady transonic flow

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