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Nonpremixed flame control with microjets

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Abstract

The hydrodynamic control of buoyant nonpremixed flames is investigated by injecting high-momentum fluid through a central microjet. The resulting flame characteristics are mapped for jets of different strengths. The flame height decreases linearly with an increase in the microjet Froude number as the flow changes from a buoyancy-dominated to a momentum-controlled regime. The flame luminosity is reduced by injecting stronger microjets. The jets alter the flame structure by establishing strong entrainment of the ambient air from the quiescent surroundings. The introduction of an inert species as the microjet fluid has a similar qualitative effect as air. Microjet assistance is as effective as partial premixing for reducing the flame height and luminosity.

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Acknowledgement

This research was supported partly by the National Science Foundation Combustion and Plasma Systems Program through Grant No. CTS–9707000 for which Dr. Farley Fisher is the Program Director, and partly by the NASA Microgravity Research Division through Grant No. NCC3–688 for which Dr. Uday Hegde serves as the technical monitor.

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Authors and Affiliations

  1. Department of Mechanical and Industrial Engineering, m/c 251, University of Illinois at Chicago, 842 W. Taylor St., Chicago, IL, 60607–7022, USA

    R. Ganguly & Ishwar K. Puri

  2. Department of Power Engineering, Jadavpur University, 700032, Calcutta, India

    R. Ganguly

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  1. R. Ganguly
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  2. Ishwar K. Puri
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Correspondence to Ishwar K. Puri.

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Ganguly, R., Puri, I.K. Nonpremixed flame control with microjets. Exp Fluids 36, 635–641 (2004). https://doi.org/10.1007/s00348-003-0749-z

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  • DOI: https://doi.org/10.1007/s00348-003-0749-z

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