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Proceedings Paper

Temperature measurements in steady axisymmetric partially premixed flames using rainbow Schlieren deflectometry
Author(s): Xudong Xiao; Ishwar K. Puri
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Paper Abstract

This investigation focuses on the utility of rainbow schlieren as a tool to measure the temperature of axisymmetric partially premixed flames (PPFs). Methane-air PPFs are established on a coannular burner. Schlieren images are found to clearly visualize these PPF characteristics through light deflection by the steep refractive index gradients in the two reaction zone fronts. The temperature distributions of two flames established at overall equivalence ratios of Φr = 1.5, and 2.0, respectively; with Φl = 0 and the bulk-averaged velocities Vreac = 60 cm s-1 and Vair = cm s-1 are inferred from color schlieren images and an error analysis is performed. The errors arise due to two sources. One lines in the process of inferring the temperature for a refractive index measurement by making assumptions regrading the local composition of the flame. Another source involves the local uncertainty in the measurement of the transverse ray displacement at the filter plane that is used to determine the refractive index and, thereafter, the final temperature. The two errors combined lead to an uncertainty of less than 7 percent for both flames.

Paper Details

Date Published: 26 November 2001
PDF: 10 pages
Proc. SPIE 4448, Optical Diagnostics for Fluids, Solids, and Combustion, (26 November 2001); doi: 10.1117/12.449403
Show Author Affiliations
Xudong Xiao, Univ. of Illinois/Chicago (United States)
Ishwar K. Puri, Univ. of Illinois/Chicago (United States)

Published in SPIE Proceedings Vol. 4448:
Optical Diagnostics for Fluids, Solids, and Combustion
Carolyn R. Mercer; Soyoung Stephen Cha; Gongxin Shen, Editor(s)

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