Effects of the cone angle on the stability of turbulent nonpremixed flames downstream of a conical bluff body

Alper Ata; I. Bedii Ozdemir

doi:10.1007/s00231-019-02789-6

Effects of the cone angle on the stability of turbulent nonpremixed flames downstream of a conical bluff body

Alper Ata^*, I. Bedii Ozdemir

^*Corresponding author for this work

Department of Mechanical Engineering

Alarko-Carrier San. ve Tic. A.S.

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

The effects of a stabilizer and the annular co-flow air speed on turbulent nonpremixed methane flames stabilized downstream of a conical bluff body were investigated. Four bluff body variants were designed by changing the outer diameter of a conically shaped object. The co-flow velocity was varied from zero to 7.4 m/s, while the fuel velocity was kept constant at 15 m/s. Radial distributions of temperature and velocity were measured in detail in the recirculation zone at vertical locations of 0.5D, 1D and 1.5D. Measurements also included the CO₂, CO, NO_x and O₂ emissions at points downstream of the recirculation region. Flames were visualized under 20 different conditions, revealing various modes of combustion. The results evidenced that not only the co-flow velocity but also the bluff body diameter play important roles in the structure of the recirculation zone and, hence, the flame behavior.

Original language	English
Pages (from-to)	1627-1639
Number of pages	13
Journal	Heat and Mass Transfer
Volume	56
Issue number	5
DOIs	https://doi.org/10.1007/s00231-019-02789-6
Publication status	Published - 1 May 2020

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Publisher Copyright:
© 2019, Springer-Verlag GmbH Germany, part of Springer Nature.

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abstract = "The effects of a stabilizer and the annular co-flow air speed on turbulent nonpremixed methane flames stabilized downstream of a conical bluff body were investigated. Four bluff body variants were designed by changing the outer diameter of a conically shaped object. The co-flow velocity was varied from zero to 7.4 m/s, while the fuel velocity was kept constant at 15 m/s. Radial distributions of temperature and velocity were measured in detail in the recirculation zone at vertical locations of 0.5D, 1D and 1.5D. Measurements also included the CO2, CO, NOx and O2 emissions at points downstream of the recirculation region. Flames were visualized under 20 different conditions, revealing various modes of combustion. The results evidenced that not only the co-flow velocity but also the bluff body diameter play important roles in the structure of the recirculation zone and, hence, the flame behavior.",

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Effects of the cone angle on the stability of turbulent nonpremixed flames downstream of a conical bluff body

Abstract

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