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Improvement of the Steel-Plate Temperature during Preheating by Using Guide Vanes to Focus the Flame at the Outlet of a Gas Torch

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  • Tu Thien Ngo

    (School of Mechanical and Automotive Engineering, University of Ulsan, Ulsan 44610, Korea
    Faculty of Mechanical Engineering, Ho Chi Minh City University of Technology (HCMUT), VNU-HCM, Ho Chi Minh City 700000, Vietnam)

  • Tianjun Zhou

    (School of Mechanical and Automotive Engineering, University of Ulsan, Ulsan 44610, Korea)

  • Junho Go

    (School of Mechanical and Automotive Engineering, University of Ulsan, Ulsan 44610, Korea)

  • Hap Van Nguyen

    (Faculty of Mechanical Engineering, Ho Chi Minh City University of Technology (HCMUT), VNU-HCM, Ho Chi Minh City 700000, Vietnam)

  • Geun Sik Lee

    (School of Mechanical and Automotive Engineering, University of Ulsan, Ulsan 44610, Korea)

Abstract

The temperature distribution on a steel plate during a preheating process was compared using gas torch models with and without guide vanes. Numerical simulations were done using ANSYS FLUENT software, and experiments were done using thermal images obtained by a TVS-200EX infrared thermal camera. Liquefied petroleum gas (LPG) was used as fuel for the gas torch in the simulation and experiment. The temperature distribution on the steel plate and the flame region were first compared. The temperature increase caused by the flame concentration with the guide vanes was 65 °C. The transient and steady-state temperature distribution on the back side of the steel plate were then examined. The results showed good agreement between the simulation and experimental results. At steady state, the back-side temperature deviation of the steel plate between the numerical simulation and experimental results was approximately 4.9%. The effects of the equivalence ratio (Φ), Reynolds number (Re), and the downstream distance ratio of the combustion gas from the torch outlet to the steel plate (H/d) on the temperature distribution were also investigated. The highest temperature distribution was found in stoichiometric combustion. The temperature of the plate increased as the Reynolds number increased from 2368 to 4876 but decreased as the distance ratio (H/d) increased from 25 to 75. The guide vane angles at the gas torch outlet were from 30 to 60 degrees, and the angle of 40 degrees resulted in the highest temperature of the steel plate.

Suggested Citation

  • Tu Thien Ngo & Tianjun Zhou & Junho Go & Hap Van Nguyen & Geun Sik Lee, 2019. "Improvement of the Steel-Plate Temperature during Preheating by Using Guide Vanes to Focus the Flame at the Outlet of a Gas Torch," Energies, MDPI, vol. 12(5), pages 1-21, March.
  • Handle: RePEc:gam:jeners:v:12:y:2019:i:5:p:869-:d:211253
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    References listed on IDEAS

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    2. Pantangi, V.K. & Mishra, Subhash C. & Muthukumar, P. & Reddy, Rajesh, 2011. "Studies on porous radiant burners for LPG (liquefied petroleum gas) cooking applications," Energy, Elsevier, vol. 36(10), pages 6074-6080.
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