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

Weiss, Armin and Geisler, Reinhard and Schwermer, Till and Yorita, Daisuke and Henne, Ulrich and Klein, Christian and Raffel, Markus (2017) Single-shot pressure-sensitive paint lifetime measurements on fast rotating blades using an optimized double-shutter technique. 6th German-Japanese Joint Seminar (GJJS), 25.-27. Sep. 2017, Stuttgart, Deutschland.

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Official URL: https://www.uni-hohenheim.de/

Abstract

Kurzfassung: A pressure-sensitive paint (PSP) system is presented to measure global surface pressures on fast rotating blades. lt 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 (Mtip = 0.29-0.57; Retip = 4.63-9.26x105). 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 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.

Item URL in elib:https://elib.dlr.de/118641/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Paper DOI: 10.1007 /s00348-017-2400-4
Title:Single-shot pressure-sensitive paint lifetime measurements on fast rotating blades using an optimized double-shutter technique
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Weiss, ArminArmin.Weiss (at) dlr.dehttps://orcid.org/0000-0002-7532-2974
Geisler, ReinhardReinhard.Geisler (at) dlr.deUNSPECIFIED
Schwermer, TillTill.Schwermer (at) dlr.dehttps://orcid.org/0000-0002-6918-4480
Yorita, Daisukedaisuke.yorita (at) dlr.deUNSPECIFIED
Henne, UlrichUNSPECIFIEDUNSPECIFIED
Klein, ChristianChristian.Klein (at) dlr.deUNSPECIFIED
Raffel, MarkusMarkus.Raffel (at) dlr.deUNSPECIFIED
Date:2017
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:pressure-sensitive paint; single-shot lifetime technique; image blur; roter aerodynamics
Event Title:6th German-Japanese Joint Seminar (GJJS)
Event Location:Stuttgart, Deutschland
Event Type:international Conference
Event Dates:25.-27. Sep. 2017
Organizer:Universität Hohenheim
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Institute for Aerodynamics and Flow Technology > Helicopter, GO
Deposited By: Bachmann, Barbara
Deposited On:01 Feb 2018 15:43
Last Modified:15 Feb 2018 14:44

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