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Wall Pressure Measurements in a Y-Junction at Pulsating Flow using Polymer/Ceramic Pressure Sensitive Paint
KTH, School of Engineering Sciences (SCI), Mechanics, Fluid Physics.
KTH, School of Engineering Sciences (SCI), Mechanics.
KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0002-1146-3241
2011 (English)In: Proceedings of the 10th International Symposium on Experimental and Computational Aerothermodynamics of Internal Flows, 2011, p. 1-6Conference paper, Published paper (Refereed)
Abstract [en]

In this experiment ruthenium based polymer/ceramic pressure sensitive paint (PC-PSP) has been used to study the pressure inside a y-junction at pulsating flow conditions. Pressure has been measured using the intensity based method and through phase locked averages. The aim has been to investigate the potential of PC-PSP at mass flows and pulse frequencies typical of those in the exhaust manifold of internal combustion engines. 

Place, publisher, year, edition, pages
2011. p. 1-6
Keyword [en]
time resolved PSP, PC-PSP, y-junction, internal flow, pulsating flow
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-49123OAI: oai:DiVA.org:kth-49123DiVA, id: diva2:459276
Conference
10th International Symposium on Experimental and Computational Aerothermodynamics of Internal Flows
Note
QC 20111208Available from: 2011-12-08 Created: 2011-11-25 Last updated: 2014-09-01Bibliographically approved
In thesis
1. Measuring with pressure sensitive paint in time-varying flows
Open this publication in new window or tab >>Measuring with pressure sensitive paint in time-varying flows
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Increasingly tougher legislation on internal combustion engine emissions drives the development towards smaller engines with higher efficiency where an important component is the gas-exchange system and especially the turbocharger. The flow in the gas-exchange system is inherently pulsating and unsteady and the present thesis aims at investigating if and how pressure sensitive paint (PSP) can be used for internal unsteady flows of relevance for engine applications. PSP is an optical non-intrusive technique for pressure measurements on surfaces and in the thesis different acquisition, evaluation and signal-to-noise-raising methods have been evaluated and developed with focus on unsteady internal flow. In particular it describes a path towards measurements of unsteady pressure distributions on the impeller blades of turbocharger compressors appearing in compressors at surge.

As a first step, dynamic calibration of a polymer/ceramic pressure sensitive paint (PC-PSP) was made using a shock tube. The cut-off frequency for the tested ruthenium-based formulation was found to be a few kilohertz; sufficient for resolving unsteady compressor behaviour such as surge and rotating stall.

The same PC-PSP was used for measurements of the pressure on the inside wall of a y-junction sized to resemble the exhaust manifold of a car engine. The intensity method was used where a LED array provided excitation light and luminescent intensities was acquired using a CCD camera. Phase averaging was made in-camera by summing the intensity from several LED flashes phase locked to the flow pulses.

A filtering technique based on singular value decomposition (SVD) was also developed. As a test case the fluctuating pressure field due to unsteady vortex shedding on the side of a square cylinder was evaluated. The data was captured using a high speed CMOS camera and continuous LED light. The result was a reduction of pixel noise on the order of two magnitudes that made it possible to recover vortex shedding behaviour otherwise submerged in noise.

Due to complex geometries and high rotational speeds, pressure measurements on the impeller blades are unfeasible using traditional pressure taps and transducers and here the pressure was measured with PSP on the impeller blades of a rotating compressor. For this study, point measurements using a scanning laser for excitation and a photomultiplier tube for the acquisition of the luminescence was used and evaluated with the so called lifetime method. The measurements were able to capture the surge frequency as well as its spatial distribution.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. p. viii, 54
Series
TRITA-MEK, ISSN 0348-467X ; 2014.18
Keyword
Pressure sensitive paint, fluid mechanics, internal flow, pulsating flow
National Category
Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-149576 (URN)978-91-7595-246-8 (ISBN)
Public defence
2014-09-26, Sal F3, Lindstedtsvägen 26, KTH, Stockholm, 14:15 (English)
Opponent
Supervisors
Note

QC 20140901

Available from: 2014-09-01 Created: 2014-08-25 Last updated: 2014-09-01Bibliographically approved

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Alfredsson, P. Henrik

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