NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Optical Instrumentation for Temperature and Velocity Measurements in Rig TurbinesNon-intrusive optical measurement techniques have been examined in the context of developing robust instruments which can routinely yield data of engineering utility in high speed turbomachinery test rigs. The engineering requirements of such a measurement are presented. Of particular interest were approaches that provide both velocity and state-variable information in order to be able to completely characterize transonic flowfields. Consideration of all of the requirements lead to the selection of particle image velocimetry (PIV) for the approach to velocity measurement while laser induced fluorescence of oxygen (O2 LIF) appeared to offer the most promise for gas temperature measurement. A PIV system was developed and demonstrated on a transonic turbine stage in the MIT blowdown turbine facility. A comprehensive data set has been taken at one flow condition. Extensive calibration established the absolute accuracy of the velocity measurements to be 3-5 %. The O2 LIF proved less successful. Although accurate for low speed flows, vibrational freezing of O2 prevented useful measurements in the transonic, 300-600 K operating range of interest here.
Document ID
19980206028
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Ceyhan, I.
(Massachusetts Inst. of Tech. Cambridge, MA United States)
dHoop, E. M.
(Massachusetts Inst. of Tech. Cambridge, MA United States)
Guenette, G. R.
(Massachusetts Inst. of Tech. Cambridge, MA United States)
Epstein, A. H.
(Massachusetts Inst. of Tech. Cambridge, MA United States)
Bryanston-Cross, P. J.
(Warwick Univ. Coventry, United Kingdom)
Date Acquired
August 18, 2013
Publication Date
May 1, 1998
Subject Category
Optics
Distribution Limits
Public
Copyright
Public Use Permitted.
Document Inquiry

Available Downloads

There are no available downloads for this record.
No Preview Available