https://scholars.lib.ntu.edu.tw/handle/123456789/598056
Title: | Flame structure and fuel reaction on a non-premixed shuttlecock-like conical burner | Authors: | Chiu C.-P Lu Y Sheng Y.-T Yeh S.-I Yang J.-T. JING-TANG YANG |
Keywords: | Flame temperature;OH* chemiluminescence;Reaction intensity;Reaction zone;Shuttlecock-like;Slot structure;Combustion;Efficiency;Flame research;Fuels;Vortex flow;Co-flow;Flame structure;Flame temperatures;Non-premixed;Nonpremixed combustion;OH chemiluminescence;Reaction zones;Slot structures;Chemiluminescence | Issue Date: | 2021 | Journal Volume: | 127 | Source: | International Communications in Heat and Mass Transfer | Abstract: | To promote the efficiency of non-premixed combustion, we designed slot structures with a simple geometry on the side of a conical burner named a shuttlecock-like conical burner. The slot structure which can introduce the air co-flow naturally into the cone instead of using other and complicated geometry is inspired from the particular shape of a shuttlecock serving as a missile in badminton sport. Therefore, the air co-flow not only produces a recirculation zone on the edge of the burner but also moves directly into the burner. The combustion condition transforms from non-premixed to partially premixed combustion; the mixing and reaction of fuel and oxidant are hence greatly enhanced. We observed the structures of the flame and the flow of a shuttlecock-like conical burner, and examined its reaction characteristics with measurements of the chemiluminescence of OH* and the flame temperature. The observation of an isothermal flow field demonstrates that the air co-flow moves directly into the burner via the slots. Double pairs of vortex structures are observed above the exit of the burner because the introduced air co-flow decreases the strength of the outer vortex, allowing the central jet to form an inner vortex. The reaction zone of a shuttlecock-like conical burner hence approaches not only the central region of the flame but also the burner exit. The reaction intensity of the fuel of a shuttlecock-like conical burner is also stronger than that of an ordinary conical burner (without the slots). The designed shuttlecock-like conical burner is significantly useful to serve as a reference to improve the combustion efficiency of non-premixed combustion. ? 2021 Elsevier Ltd |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85111050293&doi=10.1016%2fj.icheatmasstransfer.2021.105467&partnerID=40&md5=ad8caaaf857c8dc09eb96cb3380a3a26 https://scholars.lib.ntu.edu.tw/handle/123456789/598056 |
ISSN: | 07351933 | DOI: | 10.1016/j.icheatmasstransfer.2021.105467 |
Appears in Collections: | 機械工程學系 |
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