title: Measuring Surface Pressure on Rotating Compressor Blades Using Pressure Sensitive Paint.
abstract: Pressure sensitive paint (PSP) was used to measure pressure on the blades of a radial compressor with a 51 mm inlet diameter rotating at speeds up to 50 krpm using the so called lifetime method. A diode laser with a scanning-mirror system was used to illuminate the paint and the luminescent lifetime was registered using a photo multiplier. With the described technique the surface-pressure fields were acquired for eight points in the compressor map, useful for general understanding of the flow field and for CFD validation. The PSP was of so called fast type, which makes it possible to observe pressure variations with frequencies up to several kHz. Through frequency spectrum analysis we were able to detect the pulsating flow frequency when the compressor was driven to surge.
authors.affiliation: Competence Center for Gas Exchange (CCGEx), KTH Mechanics, SE-100 44 Stockholm, Sweden. markuspa@mech.kth.se.
authors.forename: Markus
authors.initials: M
authors.lastname: Pastuhoff
authors.affiliation: Competence Center for Gas Exchange (CCGEx), KTH Mechanics, SE-100 44 Stockholm, Sweden. nt@mech.kth.se.
authors.forename: Nils
authors.initials: N
authors.lastname: Tillmark
authors.affiliation: Competence Center for Gas Exchange (CCGEx), KTH Mechanics, SE-100 44 Stockholm, Sweden. hal@mech.kth.se.
authors.forename: P Henrik
authors.initials: PH
authors.lastname: Alfredsson
keywords: PSP; compressor; pressure sensitive paint; turbo charger