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A comparative study of the pulsating flames with different air inlet port geometrical shape

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Abstract

The present study represents a numerical simulation of the experimental diffusion combustion of liquified petroleum gas with pulsating air in a cylindrical chamber. The simulation focused on the effect of mixing air inlet square shape with pulsation combustion on the temperature, combustion products velocity, turbulent viscosity, carbon monoxide, mass fraction of nitric oxide and soot. The simulation is applied by Ansys fluent 16 commercial packages solving probability density function equation and large eddy simulation. The sinusoidal air inlet velocity had a frequency of 200 rad/s with 3.4 m/s velocity amplitude. Two air inlet ports are used circular and a square shape which all have an equivalent inlet area of 120 mm2. The numerical results are compared to experimental results of circular shape and achieve an acceptable agreement. It is noticed that the excitation leads to widening of the flame zone and a decrease in the flame length by 55%, also the average temperature decreases from 2050 to 1650 K in square shape and from 1900 to 1600 K in circular shape. The mass fraction of carbon monoxide, nitrogen oxide, and soot are reduced by 23%, 88% and 60%, respectively due to the pulsation and the addition of the sharp corner to the pulsation reduced them by 30%, 92%, and 70%, respectively.

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Abbreviations

Re:

Reynolds number ≡ ratio of inertial forces to viscous forces (dimensionless)

∇:

Gradient operator

y + :

Dimensionless distance from the wall

µ:

Dynamic viscosity (cP, Pa-s, lbm /ft-s)

\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\rightharpoonup}$}} {v}\) :

Overall velocity vector (m/s, ft/s)

f:

Frequency (rad/s)

\(\rho\) :

Density (kg/m3)

\(\vec{F}\) :

Force vector (N)

H:

Total enthalpy (energy/mass, energy/mole)

S:

Total entropy

\(\overrightarrow{g}\) :

Gravitational acceleration (m/s2, ft/s2); standard values = 9.80665 m/s2, 32.1740 ft/s2

ℓ, l, L:

Length scale (m, cm, ft, in)

K:

Equilibrium constant

\({S}_{ij}\) :

Mean rate-of-strain tensor (s – 1)

T:

Temperature (K, o C, o R, o F)

t:

Time (s)

C P :

Heat capacity at constant pressure,volume (J/kg K)

P:

Pressure (Pa, atm, mm Hg)

St:

Strouhal number

LPG:

Liquefied petroleum gas

LES:

Large eddy simulation

TKE:

Turbulent kinetic energy

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Authors and Affiliations

  1. Department of Mechanical Power Engineering, Faculty of Engineering, Ain Shams University, Abdo Basha, El Sarayat St., 1, Cairo, Egypt

    Mahmoud Magdy, MM Kamal, AM Hamed, Ahmed Eldein Hussin & W Aboelsoud

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  1. Mahmoud Magdy
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  2. MM Kamal
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  3. AM Hamed
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  4. Ahmed Eldein Hussin
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  5. W Aboelsoud
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Correspondence to Mahmoud Magdy.

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Magdy, M., Kamal, M., Hamed, A. et al. A comparative study of the pulsating flames with different air inlet port geometrical shape. Sādhanā 47, 31 (2022). https://doi.org/10.1007/s12046-021-01799-7

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