Study on the Effects of Cone Height on the Turbulent Nonpremixed Flames Downstream of a Conical Bluff Body

被引:1
|
作者
Ata, Alper [1 ]
Ozdemir, I. Bedii [2 ]
机构
[1] Alarko Carrier San ve Tic AS, R&D Manager Heating, Sahabettin Bilgisu Cad, TR-41480 Kocaeli, Turkey
[2] Istanbul Tech Univ, Fac Mech Engn, TR-34437 Maslak, Turkey
关键词
turbulent nonpremixed methane flame; conical bluff body; cone angle; emissions; combustion and reactive flows; VELOCITY-MEASUREMENTS; DISC STABILIZER; FLOW-FIELD; MECHANISMS; BURNER; SHAPE;
D O I
10.1115/1.4048678
中图分类号
O414.1 [热力学];
学科分类号
摘要
Flow, thermal, and emission characteristics of turbulent nonpremixed CH4 flames were investigated for three burner heads of different cone heights. The fuel velocity was kept constant at 15 m/s, while the coflow air speed was varied between 0 and 7.4 m/s. Detailed radial profiles of the velocity and temperature were obtained in the bluff body wake at three vertical locations of 0.5D, 1D, and 1.5D. Emissions of CO2, CO, NOx, and O-2 were also measured at the tail end of every flame. Flames were digitally photographed to support the point measurements with the visual observations. Fifteen different stability points were examined, which were the results of three bluff body variants and five coflow velocities. The results show that a blue-colored ring flame is formed, especially at high coflow velocities. The results also illustrate that depending on the mixing at the bluff-body wake, the flames exhibit two modes of combustion regimes, namely fuel jet- and coflow-dominated flames. In the jet-dominated regime, the flames become longer when compared with the flames of the coflow-dominated regime. In the latter regime, emissions were largely reduced due to the dilution by the excess air, which also surpasses their production.
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页数:8
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