Spatially-resolved soot evolution and statistics in high-pressure diesel spray flames using two-color pyrometry

Reggeti, Shawn A.; Parker, Allen J.; Stevenson, Anna L.; Agrawal, Ajay K.; Bittle, Joshua A.

doi:10.1016/j.combustflame.2024.113297

Spatially-resolved soot evolution and statistics in high-pressure diesel spray flames using two-color pyrometry

Journal Article · Mon Jan 22 00:00:00 EST 2024 · Combustion and Flame

DOI:https://doi.org/10.1016/j.combustflame.2024.113297· OSTI ID:2339622

^[1]; ^[2]; Stevenson, Anna L. ^[2]; ^[2]; ^[2]

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

Previous studies of diesel spray flames have focused on details of the sooting behavior mainly during the quasi-steady period, but few have considered the spatially-resolved transient evolution in combination with injection-to-injection variations. In this study, a 500-injection data set is utilized to investigate the temporal evolution of a spray flame during auto-ignition, the premixed burn phase, and the quasi-steady period. Spatially-resolved OH* chemiluminescence data provide ignition delay times and reaction zone locations. Two-color pyrom-etry with a vastly improved optical system is used to quantify spatially-resolved soot evolution and its statistical variations. The ambient thermodynamic con-ditions are slightly below those in modern diesel engines, resulting in longer lift-off lengths and lower overall soot production. Spatially, soot formation in the lift-off region is small, but appreciable soot forms in the jet core and jet head regions, while it oxidizes gradually on the jet periphery. Total soot mass profiles indicate that regions with larger local soot mass take longer to form, but are the first to oxidize. Probability distributions of soot mass in localized regions indicate that a few injections with high soot mass bias the average soot mass data towards higher values. Altogether, results show good agreement with previous studies employing different diagnostic techniques while providing statistical details of transient and localized soot behavior in high pressure diesel spray flames in support of the related modeling efforts.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: EE0007980

OSTI ID:: 2339622

Alternate ID(s):: OSTI ID: 2282384

Journal Information:: Combustion and Flame, Journal Name: Combustion and Flame Vol. 261; ISSN 0010-2180

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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