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Heat transfer characteristics of an inverse diffusion flame with induced swirl

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Abstract

The flame shapes and heat transfer characteristics of methane swirling inverse diffusion flame jet are studied experimentally in an inverse diffusion flame burner. The twisted tape of 15 mm pitch (corresponding to the twist ratio of 2.5 and swirl number of 0.62) is used to create the swirl in the flame jet. The influence of twisted tape at an air jet Reynolds number varying from 1500 to 3000, equivalence ratio varying from 0.4 to 1.4 and burner surface to impingement plate distance of 10–100 mm, is studied. The heat transfer characteristics from an IDF burner are studied through an evaluation of the average heat flux distribution and its coefficient of variance for the four distinct areas on an impingement plate. Results show that the swirl augments the heat flux distribution by up to 480% for slightly richer than stoichiometric flames. Furthermore, the impact of swirling is observed to boost the uniformity of heat flux distribution.

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Abbreviations

Re:

Reynolds number of air jet

\(\dot{m}\) :

Mass flow rate of air (kg/s)

d :

Diameter of air jet (m)

k :

Thermal conductivity (W/m K)

\(\bar{q}^{\prime \prime }\) :

Average heat flux (W/m2)

t :

Time (s)

T :

Temperature (K)

Z :

Quartz plate thickness (mm)

p :

Twisted tape pitch (mm)

w :

Twisted tape width (mm)

S:

Swirl number

N :

Total number of pixels

\(E_{{q^{\prime \prime } }}\) :

Enhancement factor for average heat flux

\(E_{\text{COV}}\) :

Enhancement factor for COV

stoic:

Stoichiometric

act:

Actual

i :

Initial

-:

Average

α :

Thermal diffusivity (m2/s)

ϕ :

Equivalence ratio

µ :

Absolute viscosity of air (Pa s)

σ std :

Standard deviation

A:

Air

F:

Fuel

RSS:

Root sum of squares

IDF:

Inverse diffusion flame

TR:

Twist ratio

COV:

Coefficient of variance

H:

Distance between burner surface to target plate

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Authors and Affiliations

  1. Department of Mechanical Engineering, KLS, VDIT, Haliyal, Karnataka, India

    Shankar Badiger, Vijaykumar Hindasageri & V. V. Katti

  2. Department of Aeronautical Engineering, KLS, GIT, Belagavi, Karnataka, India

    T. R. Anil

Authors
  1. Shankar Badiger
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  2. T. R. Anil
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  3. Vijaykumar Hindasageri
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  4. V. V. Katti
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Correspondence to Shankar Badiger.

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Technical Editor: Mario Eduardo Santos Martins, Ph.D.

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Badiger, S., Anil, T.R., Hindasageri, V. et al. Heat transfer characteristics of an inverse diffusion flame with induced swirl. J Braz. Soc. Mech. Sci. Eng. 42, 252 (2020). https://doi.org/10.1007/s40430-020-02330-5

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  • DOI: https://doi.org/10.1007/s40430-020-02330-5

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