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Numerical analysis of a non-steady state phenomenon during the ignition process in a condensing boiler

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  • Mohr, Manuel
  • Klančišar, Marko
  • Schloen, Tim
  • Samec, Niko
  • Kokalj, Filip

Abstract

This paper presents the most appropriate numerical approach for investigation of the ignition phenomena of the premixed confined combustion in a condensing boiler. A transient simulation with the coupling of the burning velocity model was sufficient enough to describe fully the phenomena that are responsible for the ignition sequence and the flame stabilization, representing most of the actual ignition problems in general. Detailed simulation investigation with the ignition model leads to better comprehension of the whole flame stabilization process and, as a consequence, it facilitates the optimization potential of the global ignition process in boilers. Four different ignition power loads were observed in the investigation. Also, the ratio between oxidizer (air in our case) and the fuel (Methane) was based on the normal combustion process for the described condensing boiler. The numerical results were validated with the experimental set up and testing. Results comparison shows very good correlation of numerical simulation with the experimental case. The ignition times both tested and simulated, that have a significant impact on flame stabilization, are in very good correlation. Also, very good correlations were obtained between the pressure profiles of the numerical and experimental studies.

Suggested Citation

  • Mohr, Manuel & Klančišar, Marko & Schloen, Tim & Samec, Niko & Kokalj, Filip, 2018. "Numerical analysis of a non-steady state phenomenon during the ignition process in a condensing boiler," Energy, Elsevier, vol. 158(C), pages 623-631.
    • Handle: RePEc:eee:energy:v:158:y:2018:i:c:p:623-631
    DOI: 10.1016/j.energy.2018.06.038
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    References listed on IDEAS

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    1. Alipoor, Alireza & Mazaheri, Kiumars, 2016. "Combustion characteristics and flame bifurcation in repetitive extinction-ignition dynamics for premixed hydrogen-air combustion in a heated micro channel," Energy, Elsevier, vol. 109(C), pages 650-663.
    2. Zhen, Xudong & Wang, Yang, 2013. "Study of ignition in a high compression ratio SI (spark ignition) methanol engine using LES (large eddy simulation) with detailed chemical kinetics," Energy, Elsevier, vol. 59(C), pages 549-558.
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    1. Yılmaz, Semih & Kumlutaş, Dilek & Yücekaya, Utku Alp & Cumbul, Ahmet Yakup, 2021. "Prediction of the equilibrium compositions in the combustion products of a domestic boiler," Energy, Elsevier, vol. 233(C).

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