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Oscillatory Flame Response in Acoust...

Sevilla Esparza, Cristhian Israel.

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Oscillatory Flame Response in Acoustically Coupled Fuel Droplet Combustion.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Oscillatory Flame Response in Acoustically Coupled Fuel Droplet Combustion./
Author:	Sevilla Esparza, Cristhian Israel.
Description:	129 p.
Notes:	Source: Masters Abstracts International, Volume: 51-06.
Contained By:	Masters Abstracts International51-06(E).
Subject:	Engineering, Aerospace. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1538965
ISBN:	9781303133220

Oscillatory Flame Response in Acoustically Coupled Fuel Droplet Combustion.
Sevilla Esparza, Cristhian Israel.

Oscillatory Flame Response in Acoustically Coupled Fuel Droplet Combustion. - 129 p.

Source: Masters Abstracts International, Volume: 51-06.

Thesis (M.S.)--University of California, Los Angeles, 2013.

This experimental study focuses on combustion of liquid fuel droplets subject to external acoustic disturbances in the form of standing waves within an acoustic waveguide. Acoustic perturbations create a mean flame deflection dependent on the droplet location relative to the pressure node (PN) or pressure antinode (PAN) in the waveguide. This flame deflection is consistent with the sign of a theoretical acoustic acceleration acting on the burning system. Yet experimentally derived acoustic accelerations estimated from the degree of flame deflection differ quantitatively from that predicted by the acoustic radiation force theory. Phase locked OH* chemiluminescence imaging reveals a deflected flame which oscillates in position relative to the stationary droplet. Flame luminosity fluctuates with pressure throughout the forcing period, indicating the flame heat release rate is influenced by acoustic excitation. The thermoacoustic instability fostered by the in-phase oscillation of pressure and heat release rate is quantified via the Rayleigh index. Evaluation of the Rayleigh index over a range of acoustic forcing frequencies and droplet locations exposes the frequency sensitive character of the combustion mechanism stemming from dissimilar acoustic and chemical kinetic time scales. The present experimental configuration provides a useful test bed for evaluating the response of different alternative and conventional fuels to an acoustically resonant environment in the context of the well-known Rayleigh criterion.

ISBN: 9781303133220Subjects--Topical Terms:

1018395
Engineering, Aerospace.

Oscillatory Flame Response in Acoustically Coupled Fuel Droplet Combustion.
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008 150210s2013 ||||||||||||||||| ||eng d
020 $a 9781303133220
035 $a (MiAaPQ)AAI1538965
035 $a AAI1538965
040 $a MiAaPQ $c MiAaPQ
100 1 $a Sevilla Esparza, Cristhian Israel. $3 2094088
245 1 0 $a Oscillatory Flame Response in Acoustically Coupled Fuel Droplet Combustion.
300 $a 129 p.
500 $a Source: Masters Abstracts International, Volume: 51-06.
500 $a Adviser: Ann R. Karagozian.
502 $a Thesis (M.S.)--University of California, Los Angeles, 2013.
520 $a This experimental study focuses on combustion of liquid fuel droplets subject to external acoustic disturbances in the form of standing waves within an acoustic waveguide. Acoustic perturbations create a mean flame deflection dependent on the droplet location relative to the pressure node (PN) or pressure antinode (PAN) in the waveguide. This flame deflection is consistent with the sign of a theoretical acoustic acceleration acting on the burning system. Yet experimentally derived acoustic accelerations estimated from the degree of flame deflection differ quantitatively from that predicted by the acoustic radiation force theory. Phase locked OH* chemiluminescence imaging reveals a deflected flame which oscillates in position relative to the stationary droplet. Flame luminosity fluctuates with pressure throughout the forcing period, indicating the flame heat release rate is influenced by acoustic excitation. The thermoacoustic instability fostered by the in-phase oscillation of pressure and heat release rate is quantified via the Rayleigh index. Evaluation of the Rayleigh index over a range of acoustic forcing frequencies and droplet locations exposes the frequency sensitive character of the combustion mechanism stemming from dissimilar acoustic and chemical kinetic time scales. The present experimental configuration provides a useful test bed for evaluating the response of different alternative and conventional fuels to an acoustically resonant environment in the context of the well-known Rayleigh criterion.
590 $a School code: 0031.
650 4 $a Engineering, Aerospace. $3 1018395
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Physics, Acoustics. $3 1019086
690 $a 0538
690 $a 0548
690 $a 0986
710 2 $a University of California, Los Angeles. $b Aerospace Engineering 0279. $3 2092189
773 0 $t Masters Abstracts International $g 51-06(E).
790 $a 0031
791 $a M.S.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1538965