Non-premixed flame characteristics and exhaust gas concentrations behind rifled bluff-body cones

被引:8
作者
Yen, Shun-Chang [1 ]
Shih, Chih-Long [1 ]
San, Kuo-Ching [2 ]
机构
[1] Natl Taiwan Ocean Univ, Dept Mech & Mechatron Engn, Keelung 202, Taiwan
[2] ROC Air Force Acad, Dept Aeronaut & Astronaut, Kaohsiung 820, Taiwan
关键词
Rifled bluff-body cone; Non-premixed; Schlieren photography; Flame length; Exhaust gas; STABILIZED FLAMES; THERMAL STRUCTURE; COMBUSTION;
D O I
10.1016/j.joei.2017.04.008
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Four bluff-body cones with/without rifled v-grooves were installed behind a non-premixed traditional combustion nozzle to intensify the bluff-body effects and swirl flow. The spiral rifles transformed axial momentum (or axial velocity) into tangential momentum (or tangential velocity). The interaction between the fuel tangential component and axial air flow increased turbulence intensity (T.I) The Schlieren photography was utilized to visualize the flame structures and classify three flame patterns jet flame, recirculation flame, and turbulence flame. The jet flame occurs when fuel-jet velocity is high and air-jet velocity (u(a)) is low. However, the turbulence flame exists at the high air-jet velocity. The flame lengths were measured using the direct photography scheme. The flame length at high ua is significantly shorter than that at low ua. Furthermore, the increase of rifle number (i.e., increasing T.I) induces the high maximum temperature and low nitric-oxide concentration. (C) 2017 Energy Institute. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:489 / 501
页数:13
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