Numerical investigation of the effects of material, wall thickness, one and two zones porousity in a thermo-photovoltaic combustion chamber

Document Type : Original Article

Authors

1 Assistant Professor, Al-Zahra University, Tehran, Iran

2 Master's student at Al-Zahra University, Tehran, Iran

3 Master's degree, Al-Zahra University, Tehran, Iran

Abstract

The performance of combustion chambers for use in thermo-photovoltaic systems depends on some factors such as the material of chamber, wall thickness, and the presence of porous medium in the combustion chamber, which has been investigated in this research. In order to simulate a numerical model, the realizable k-ε and the finite rate- eddy dissipation models have been used to model flow turbulence and hydrogen gas combustion, respectively. Three different wall thicknesses at constant equivalence ratio of 0.8 and velocities of 2 m/s and 3 m/s have been studied. The results show that decreasing the wall thickness increases the temperature of the outer wall and the radiation efficiency of the chamber. The maximum temperature increases by 111 and 141 °C at the velocity of 2 m/s and at the thickness of 0.2 mm as compared to the thicknesses of 0.5 mm and 0.8 mm and by 79 and 107 °C at the velocity of 3 m/s. Also, the combustion chamber has been simulated with three different materials of walls, Al2O3, SiC and Stainless Steel(SS316). The results show that when the wall is made of Al2O3, the efficiency is higher. In another part of this research, the presence of two porous zones in the chamber has led to a change in the place of flame formation. The radiation efficiency in the combustion chamber with the presence of two porous regions increases by 24%, 27%, and 28%, respectively, in the equivalence ratios of 0.6, 0.8, and 1.

Keywords

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References

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Fluid Mechanics & Aerodynamics
Volume 13, Issue 1 - Serial Number 33
Spring and summer 2024
September 2024

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History

  • Receive Date: 26 March 2024
  • Revise Date: 16 June 2024
  • Accept Date: 06 July 2024
  • Publish Date: 22 July 2024

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