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Title: Observation of multi-scale oscillation of laminar lifted flames with low-frequency AC electric fields

Abstract

The oscillation behavior of laminar lifted flames under the influence of low-frequency AC has been investigated experimentally in coflow jets. Various oscillation modes were existed depending on jet velocity and the voltage and frequency of AC, especially when the AC frequency was typically smaller than 30 Hz. Three different oscillation modes were observed: (1) large-scale oscillation with the oscillation frequency of about 0.1 Hz, which was independent of the applied AC frequency, (2) small-scale oscillation synchronized to the applied AC frequency, and (3) doubly-periodic oscillation with small-scale oscillation embedded in large-scale oscillation. As the AC frequency decreased from 30 Hz, the oscillation modes were in the order of the large-scale oscillation, doubly-periodic oscillation, and small-scale oscillation. The onset of the oscillation for the AC frequency smaller than 30 Hz was in close agreement with the delay time scale for the ionic wind effect to occur, that is, the collision response time. Frequency-doubling behavior for the small-scale oscillation has also been observed. Possible mechanisms for the large-scale oscillation and the frequency-doubling behavior have been discussed, although the detailed understanding of the underlying mechanisms will be a future study. (author)

Authors:
; ; ;  [1];  [2]
  1. School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-742 (Korea)
  2. Clean Combustion Research Center, King Abdullah University of Science and Technology, Thuwal (Saudi Arabia)
Publication Date:
OSTI Identifier:
21248848
Resource Type:
Journal Article
Journal Name:
Combustion and Flame
Additional Journal Information:
Journal Volume: 157; Journal Issue: 1; Other Information: Elsevier Ltd. All rights reserved; Journal ID: ISSN 0010-2180
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; OSCILLATIONS; LAMINAR FLAMES; ELECTRIC FIELDS; OSCILLATION MODES; PERIODICITY; ELECTRIC POTENTIAL; HZ RANGE; COLLISIONS; VELOCITY; FREQUENCY DEPENDENCE; JETS; Lifted flames

Citation Formats

Ryu, S K, Kim, Y K, Kim, M K, Won, S H, and Chung, S H. Observation of multi-scale oscillation of laminar lifted flames with low-frequency AC electric fields. United States: N. p., 2010. Web. doi:10.1016/J.COMBUSTFLAME.2009.10.001.
Ryu, S K, Kim, Y K, Kim, M K, Won, S H, & Chung, S H. Observation of multi-scale oscillation of laminar lifted flames with low-frequency AC electric fields. United States. https://doi.org/10.1016/J.COMBUSTFLAME.2009.10.001
Ryu, S K, Kim, Y K, Kim, M K, Won, S H, and Chung, S H. 2010. "Observation of multi-scale oscillation of laminar lifted flames with low-frequency AC electric fields". United States. https://doi.org/10.1016/J.COMBUSTFLAME.2009.10.001.
@article{osti_21248848,
title = {Observation of multi-scale oscillation of laminar lifted flames with low-frequency AC electric fields},
author = {Ryu, S K and Kim, Y K and Kim, M K and Won, S H and Chung, S H},
abstractNote = {The oscillation behavior of laminar lifted flames under the influence of low-frequency AC has been investigated experimentally in coflow jets. Various oscillation modes were existed depending on jet velocity and the voltage and frequency of AC, especially when the AC frequency was typically smaller than 30 Hz. Three different oscillation modes were observed: (1) large-scale oscillation with the oscillation frequency of about 0.1 Hz, which was independent of the applied AC frequency, (2) small-scale oscillation synchronized to the applied AC frequency, and (3) doubly-periodic oscillation with small-scale oscillation embedded in large-scale oscillation. As the AC frequency decreased from 30 Hz, the oscillation modes were in the order of the large-scale oscillation, doubly-periodic oscillation, and small-scale oscillation. The onset of the oscillation for the AC frequency smaller than 30 Hz was in close agreement with the delay time scale for the ionic wind effect to occur, that is, the collision response time. Frequency-doubling behavior for the small-scale oscillation has also been observed. Possible mechanisms for the large-scale oscillation and the frequency-doubling behavior have been discussed, although the detailed understanding of the underlying mechanisms will be a future study. (author)},
doi = {10.1016/J.COMBUSTFLAME.2009.10.001},
url = {https://www.osti.gov/biblio/21248848}, journal = {Combustion and Flame},
issn = {0010-2180},
number = 1,
volume = 157,
place = {United States},
year = {Fri Jan 15 00:00:00 EST 2010},
month = {Fri Jan 15 00:00:00 EST 2010}
}