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

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Abstract

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 (\(M_{\text {tip}}\) = 0.29–0.57; \(Re_{\text {tip}}\) = 4.63–9.26 \(\times 10^5\)). 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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Acknowledgements

The assistance of M. Krebs, A. D. Gardner, J. Braukmann and M. Hilfer (all DLR Göttingen) during preparation and execution of the measurements as well as the fruitful discussions with A. D. Gardner and S. Schaber (Airbus) are gratefully acknowledged.

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  1. Institute of Aerodynamics and Flow Technology, German Aerospace Center (DLR), Bunsenstraße 10, 37073, Göttingen, Germany

    Armin Weiss, Reinhard Geisler, Till Schwermer, Daisuke Yorita, Ulrich Henne, Christian Klein & Markus Raffel

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  1. Armin Weiss
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  2. Reinhard Geisler
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Correspondence to Armin Weiss.

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Weiss, A., Geisler, R., Schwermer, T. et al. Single-shot pressure-sensitive paint lifetime measurements on fast rotating blades using an optimized double-shutter technique. Exp Fluids 58, 120 (2017). https://doi.org/10.1007/s00348-017-2400-4

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