Representative Phenomena of Cyclic Turbulent Combustion in High-Pressure Fuel Sprays

Parker, Allen; Agrawal, Ajay; Bittle, Joshua

doi:10.1007/s10494-023-00432-3

Representative Phenomena of Cyclic Turbulent Combustion in High-Pressure Fuel Sprays

Journal Article · Wed Jun 07 00:00:00 EDT 2023 · Flow, Turbulence and Combustion

DOI:https://doi.org/10.1007/s10494-023-00432-3· OSTI ID:1984146

Parker, Allen; Agrawal, Ajay; Bittle, Joshua

Abstract

Cyclic variations in conventional diesel combustion engines can lead to large differences in engine out emissions even at steady operation. This study uses an optically accessible constant-pressure flow chamber to acquire fuel injections in quick succession to analyze mixing, auto-ignition, and combustion of diesel-surrogate n-heptane using multiple high-speed optical diagnostics. Prior studies have utilized fewer injections and/or they rely on analysis of ensemble average behavior. These approaches do not yield information on injection-to-injection variation or provide confidence in utilizing individual injection measurements for high-fidelity computational fluid dynamics(CFD) model validation. In this study, a large set of 500 injections is used to obtain global parameters including liquid length, vapor penetration length, ignition delay time, and lift-off length. Results for multiple injections are presented to illustrate large injection to injection variations. Potential sources for these variations are analyzed to conclude localized, small scale turbulence and rate of injection variations as the likely sources. Then, a statistical method based on z-scores is proposed and implemented to identify instantaneous injections that best represent the bulk data-set of jet boundaries measured independently by three different diagnostics. This synthesis of statistics-guided screening of data set and ensemble-average analysis offers higher confidence for CFD model validation relying upon both a representative single and average injection results.

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

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

Grant/Contract Number:: EE0007980

OSTI ID:: 1984146

Alternate ID(s):: OSTI ID: 2339625

Journal Information:: Flow, Turbulence and Combustion, Journal Name: Flow, Turbulence and Combustion Journal Issue: 2 Vol. 111; ISSN 1386-6184

Publisher:: Springer Science + Business MediaCopyright Statement

Country of Publication:: Netherlands

Language:: English

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