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Experimental and computational analysis of a row of three co-swirling impinging flames

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Abstract

Detailed flow field and heat transfer characteristics developed in a row of three co-rotating dual swirling impinging flames have been investigated experimentally as well as numerically. Impingement heat transfer and pressure distribution has been studied experimentally at different separation distances and inter-jet spacings. Inverse heat conduction procedure (IHCP) has been used for estimating heat fluxes on the front side of impingement plate. Turbulence induced mixing results in strong interactions amongst adjacent flames causing deflections of inner flames of the burners situated at sides of central burner. Numerical simulation predicted formation of asymmetric recirculation zones for side flames. Symmetric interactions taking place for central flame produced two equal recirculation lobes for central flame. Behavior of central inner flame has been observed to be dependent on the value of inter-jet spacing used. Suppression of central inner flame tend to occur at higher inter-jet spacings due to recirculating products. Impingement pressure distribution is observed to be consistent with the heat flux distribution. Averaged heat fluxes registered at the impingement plate due to the central flame are higher in magnitude to those pertaining to each of the side flames.

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Abbreviations

d :

Diameter of inner pipe (mm)

D i :

Inner diameter of outer pipe in the burner

D o :

Outer diameter of outer pipe in the burner

D h :

Hydraulic diameter (mm)

h :

Convective heat transfer coefficient

H, (H/D h ) :

Separation distance (non-dimensional)

k :

Turbulent kinetic energy (m2/s2)

M :

Molecular mass (kg/kmol)

N :

Data point in thermal image

p:

Pressure

q″ :

Heat flux (kW/m2)

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

Averaged heat flux (kW/m2)

r/D h :

Non-dimensional radial distance

Re :

Reynolds number

S, (S/D h ) :

Inter-jet spacing (non-dimensional)

t :

Time

T :

Temperature (K)

T w :

Wall temperature (K)

u m :

Mean velocity at burner exit

u, v, w :

Velocity components in x, y and z direction

X :

Mole fraction

x, y :

Coordinate axis on impingement plate

x/D h , y/D h :

Non-dimensional distances

z :

Thickness (mm)

Z :

Downstream distance from burner exit (mm)

EDM:

Eddy dissipation model

FPA:

Focal plane array

IFOV:

Instantaneous field of view

IHCP:

Inverse heat conduction procedure

MFC:

Mass flow controllers

RANS:

Reynolds averaged Navier Stokes

RCZ:

Recirculation zone

RJRC:

Radial jet reattachment combustion

RNG:

Renormalization group theory

α :

Thermal diffusivity (m2/s)

ε :

Dissipation rate (m2/s3)

λ :

Thermal conductivity (W/mK)

μ :

Dynamic viscosity(kg/m s)

ρ :

Density (kg/m3)

Φ :

Equivalence ratio

dev :

Deviation from averaged value

dev, rms :

Root mean square deviation

f :

Front side of impingement plate

FJ :

Flame jet

i :

Loop index

∞ :

Ambient

j :

Index for chemical species

r :

Rear side of impingement plate

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Acknowledgements

Authors sincerely acknowledge financial support received from Dr. B.R. Ambedkar National Institute of Technology Jalandhar for the execution of this experimental study. The author is also indebted to the faculty at Amrita Vishwa Vidyapeetham, Coimbatore, INDIA for their support and encouragement.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Dr. B.R. Ambedkar National Institute of Technology, Jalandhar, Punjab, 144011, India

    Parampreet Singh & Subhash Chander

  2. Department of Mechanical Engineering, Amrita Vishwa Vidyapeetham, Coimbatore, India

    Ratna Kishore Velamati

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  1. Parampreet Singh
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  2. Ratna Kishore Velamati
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  3. Subhash Chander
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Correspondence to Subhash Chander.

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Singh, P., Velamati, R.K. & Chander, S. Experimental and computational analysis of a row of three co-swirling impinging flames. Heat Mass Transfer 56, 365–384 (2020). https://doi.org/10.1007/s00231-019-02706-x

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