Five kHz thermometry in turbulent spray flames using chirped-probe-pulse femtosecond CARS, part II: Structure of reaction zones

Lowe, Albyn; Thomas, Levi M.; Satija, Aman; Lucht, Robert P.; Masri, Assaad R.

doi:10.1016/j.combustflame.2018.10.034

Five kHz thermometry in turbulent spray flames using chirped-probe-pulse femtosecond CARS, part II: Structure of reaction zones

Journal Article · Wed Nov 07 00:00:00 EST 2018 · Combustion and Flame

DOI:https://doi.org/10.1016/j.combustflame.2018.10.034· OSTI ID:1609416

Lowe, Albyn ^[1]; ^[2]; Satija, Aman ^[2]; Lucht, Robert P. ^[2]; Masri, Assaad R. ^[3]

Univ. of Sydney, NSW (Australia); DOE/OSTI
Purdue Univ., West Lafayette, IN (United States)
Univ. of Sydney, NSW (Australia)

Temperature was measured in turbulent spray flames of ethanol and acetone stabilized on the piloted Sydney Needle Spray Burner (SYNSBURN^TM) using single-laser-shot, chirped-probe-pulse femtosecond coherent anti-Stokes Raman spectroscopy (CPP-fs-CARS) with a repetition rate of 5 kHz. The burner features air-blast atomization of liquid injected from a needle that can be translated by a length Lr within a co-flowing air stream so that piloted spray flames ranging from dilute to dense can be studied. Part I of these investigations has reported on the CPP-fs-CARS technique and extensive details of data processing methodology. Part II is concerned with the structure of the reaction zones at different spray loadings and for different departures from blow-off. While not performed simultaneously, measurements of the size distribution of liquid fragments are also reported and discussed in conjunction with the measured temperature. Measured probability density functions of temperature show that for flames with the same liquid loading but different recess lengths, Lr, the near-field spray structure that forms upstream of x/D = 10 affects flame structure and stability further downstream. As the spray exiting the burner becomes denser, with a higher proportion of ligaments and ‘irregular’ shaped objects, the entrainment of hot pilot gases into the spray envelope is affected, hence changing the rates of vaporization and subsequent combustion. The reported results will also form a useful platform for validating sub-models of atomization and combustion in turbulent, dilute to dense spray flames.

View Accepted Manuscript (DOE)

Research Organization:: Purdue Univ., West Lafayette, IN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-03ER15391

OSTI ID:: 1609416

Alternate ID(s):: OSTI ID: 1775645

Journal Information:: Combustion and Flame, Journal Name: Combustion and Flame Vol. 200; ISSN 0010-2180

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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