The flame behavior and the thermal structure of gaseous fuel jets issued from rectangular nozzles of high and low aspect ratios with co-flowing air were experimentally studied. Two rectangular nozzles with aspect ratios AR = 36 and 3.27 and with side channels for co-flowing air were examined. Flame behaviors were studied by photography techniques. Flame temperatures were measured using a fine-wire thermocouple. The AR = 36 burner exhibited three characteristic flame modes: attached flame, transitional flame, and lifted flame. The AR = 3.27 burner presented three characteristic flame modes: diffusion flame, transitional flame, and triple-layered flame. High AR jets promoted entrainment and mixing in the region around the flame base, whereas low AR jets enhanced mixing in the regions along the flame edges. At low co-flows, at Rec < 1200, the low AR burner flames were shorter, but at Rec > 1200, the high AR burner flames became shorter and wider. At Rec > 950, the high AR burner recorded higher flame temperatures, compared to the low AR burner by over 100 °C. At high fuel jet Reynolds numbers and moderate co-flow, high AR burner flames presented better combustion performances when compared to low AR jet flames. The good combustion performance of the high AR jet flames was due to enhanced entrainment and mixing, which were induced by flame lifting. However, at low Rec and high co-flow, the low AR jet flames exhibited desirable flame characteristics due to improved entrainment and turbulence at the jet interfaces.
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August 2018
Research-Article
Combusting Jets Issued From Rectangular Nozzles of High and Low Aspect Ratios With Co-Flowing Air
Rong Fung Huang,
Rong Fung Huang
Department of Mechanical Engineering,
National Taiwan University
of Science and Technology,
No. 43, Section 4, Keelung Road,
Taipei 10672, Taiwan
e-mail: rfhuang@mail.ntust.edu.tw
National Taiwan University
of Science and Technology,
No. 43, Section 4, Keelung Road,
Taipei 10672, Taiwan
e-mail: rfhuang@mail.ntust.edu.tw
Search for other works by this author on:
Reuben Mwanza Kivindu,
Reuben Mwanza Kivindu
Department of Mechanical Engineering,
National Taiwan University
of Science and Technology,
No. 43, Section 4, Keelung Road,
Taipei 10672, Taiwan
e-mail: rkivindu@uonbi.ac.ke
National Taiwan University
of Science and Technology,
No. 43, Section 4, Keelung Road,
Taipei 10672, Taiwan
e-mail: rkivindu@uonbi.ac.ke
Search for other works by this author on:
Ching Min Hsu
Ching Min Hsu
Department of Mechanical Design Engineering,
National Formosa University,
No. 64, Wunhua Road, Huwei Township,
Yunlin County 63246, Taiwan
e-mail: cmhsu@nfu.edu.tw
National Formosa University,
No. 64, Wunhua Road, Huwei Township,
Yunlin County 63246, Taiwan
e-mail: cmhsu@nfu.edu.tw
Search for other works by this author on:
Rong Fung Huang
Department of Mechanical Engineering,
National Taiwan University
of Science and Technology,
No. 43, Section 4, Keelung Road,
Taipei 10672, Taiwan
e-mail: rfhuang@mail.ntust.edu.tw
National Taiwan University
of Science and Technology,
No. 43, Section 4, Keelung Road,
Taipei 10672, Taiwan
e-mail: rfhuang@mail.ntust.edu.tw
Reuben Mwanza Kivindu
Department of Mechanical Engineering,
National Taiwan University
of Science and Technology,
No. 43, Section 4, Keelung Road,
Taipei 10672, Taiwan
e-mail: rkivindu@uonbi.ac.ke
National Taiwan University
of Science and Technology,
No. 43, Section 4, Keelung Road,
Taipei 10672, Taiwan
e-mail: rkivindu@uonbi.ac.ke
Ching Min Hsu
Department of Mechanical Design Engineering,
National Formosa University,
No. 64, Wunhua Road, Huwei Township,
Yunlin County 63246, Taiwan
e-mail: cmhsu@nfu.edu.tw
National Formosa University,
No. 64, Wunhua Road, Huwei Township,
Yunlin County 63246, Taiwan
e-mail: cmhsu@nfu.edu.tw
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received October 26, 2017; final manuscript received November 29, 2017; published online April 10, 2018. Assoc. Editor: Matthew Oehlschlaeger.
J. Thermal Sci. Eng. Appl. Aug 2018, 10(4): 041009 (13 pages)
Published Online: April 10, 2018
Article history
Received:
October 26, 2017
Revised:
November 29, 2017
Citation
Fung Huang, R., Mwanza Kivindu, R., and Min Hsu, C. (April 10, 2018). "Combusting Jets Issued From Rectangular Nozzles of High and Low Aspect Ratios With Co-Flowing Air." ASME. J. Thermal Sci. Eng. Appl. August 2018; 10(4): 041009. https://doi.org/10.1115/1.4039055
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