Laser velocimeter measurements in a Dump combustor

Journal Article · Fri Jul 01 04:00:00 EDT 1983 · Am. Soc. Mech. Eng., (Pap.); (United States)

OSTI ID:6558162

Gould, R D; Stevenson, W H; Thompson, H D

Measurements of mean velocity and turbulence intensity have been made in the highly turbulent flow field following a sudden pipe expansion. Both isothermal and reacting flows were studied. The downstream test section was made of fused quartz to permit laser velocimeter measurements throughout the flow field for x/H values ranging from 0.33 to 15. Although maximum normalized turbulence intensity values were comparable in the two areas, there were significant differences in the spatial distribution and a reduction in turbulence intensity was observed in the reacting flow downstream of reattachment. Due to the high turbulence levels in such flows, measurement error resulting from velocity bias can be appreciable in the shear layer. This problem was studied in detail using an experimental technique developed in an earlier study to obtain bias free data. Velocity bias was found to have a major influence on the mean velocity and turbulence intensity profiles, causing an apparent shift in the location of the shear layer.

• Research Organization: Purdue University School of Mechanical Engineering West Lafayette, Indiana
• OSTI ID: 6558162
• Journal Information: Am. Soc. Mech. Eng., (Pap.); (United States), Journal Name: Am. Soc. Mech. Eng., (Pap.); (United States) Vol. 83-HT-47; ISSN ASMSA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
421000* -- Engineering-- Combustion Systems
COMBUSTORS
DATA COVARIANCES
EXPANSION
FLOW RATE
FLUID FLOW
ISOTHERMAL PROCESSES
LASERS
MEASURING INSTRUMENTS
MEASURING METHODS
PULSE COMBUSTORS
SHEAR
THERMAL EXPANSION
TURBULENT FLOW
VELOCIMETERS
VELOCITY