Robust two-colour pyrometry uncertainty analysis to acquire spatially-resolved measurements

Reggeti, Shawn A.; Agrawal, Ajay K.; A Bittle, Joshua

doi:10.1088/1361-6501/ac88e9

Robust two-colour pyrometry uncertainty analysis to acquire spatially-resolved measurements

Journal Article · Mon Sep 05 00:00:00 EDT 2022 · Measurement Science and Technology

DOI:https://doi.org/10.1088/1361-6501/ac88e9· OSTI ID:2339639

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Univ. of Alabama, Tuscaloosa, AL (United States); University of Alabama
Univ. of Alabama, Tuscaloosa, AL (United States)

Two-colour pyrometry (2CP) has been used over several decades to study engine-relevant combustion processes, but results are generally regarded as qualitative or semi-quantitative. In many current 2CP systems, large measurement errors are introduced by parallax because the two measured wavelengths are not from the same line of sight. Here this work presents a spatially-resolved 2CP system with the objective of quantifying and reducing measurement uncertainty. An optical setup that eliminates parallax in 2CP is used together with pixel-by-pixel calibration of the camera sensor to increase measurement accuracy. Primary uncertainty terms are identified, and an error propagation analysis is performed to compute uncertainties in the final results of soot temperature, soot concentration parameter, KL, and soot mass. These methodologies are applied to investigate an auto-igniting fuel spray in a constant pressure flow rig at diesel-like conditions of high ambient pressure and temperature. Results show bias uncertainty of around 200 K (≈10%) for temperature and about 40%–60% for KL. High uncertainty was found to occur on the diffusion flame front where both optical thickness and soot concentrations are small. However, these uncertain measurement zones with relatively low soot concentrations contribute minimally to the total soot mass present in the reacting jet during the temporal evolution of the flame.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Alabama, Tuscaloosa, AL (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO)

Grant/Contract Number:: EE0007980

OSTI ID:: 2339639

Journal Information:: Measurement Science and Technology, Journal Name: Measurement Science and Technology Journal Issue: 12 Vol. 33; ISSN 0957-0233

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Robust two-colour pyrometry uncertainty analysis to acquire spatially-resolved measurements

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