Doppler-shifted fluorescence imaging of velocity fields in supersonic reacting flowsThe application of Doppler-shifted fluorescence imaging of velocity fields in supersonic reacting flows is analyzed. Focussing on fluorescence of the OH molecule in typical H2-air Scramjet flows, the effects of uncharacterized variations in temperature, pressure, and collisional partner composition across the measurement plane are examined. Detailed measurements of the (1,0) band OH lineshape variations in H2-air combustions are used, along with single-pulse and time-averaged measurements of an excimer-pumped dye laser, to predict the performance of a model velocimeter with typical Scramjet flow properties. The analysis demonstrates the need for modification and control of the laser bandshape in order to permit accurate velocity measurements in the presence of multivariant flow properties.
Document ID
19920064355
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Allen, M. G. (NASA Lewis Research Center Cleveland, OH, United States)
Davis, S. J. (NASA Lewis Research Center Cleveland, OH, United States)
Kessler, W. J. (NASA Lewis Research Center Cleveland, OH, United States)
Sonnenfroh, D. M. (Physical Sciences, Inc. Andover, MA, United States)