International Scientific Journal

Thermal Science - Online First

online first only

The impinging wall effect on flame dynamics and heat transfer in non-premixed jet flames

The impinging jet flame is studied experimentally and numerically accounting for the complex flame-wall interactions in practical combustion devices. Flame dynamics and heat transfer with the effect of impinging wall are analyzed. 3D large eddy simulation coupled with detailed chemical reaction mechanism and particle image velocimetry experiment based on cross-correlation measurement principle are performed for verification and further analysis. Results show that vortices are generated due to the Kelvin-Helmholtz instability originated from velocity gradient. 3D vortex interactions involving vortex rings and spirals are also indicated by vorticity and the convection of stream wise vorticity is responsible for the effect of vortex spirals associated with turbulent flow transition. In addition, results calculated from four wall thermal conditions are compared and analyzed. Dirichlet condition is inferred to be more suitable for the case of wall materials with higher thermal conductivity. It is indicated that wall thermal condition mainly affects the heat transfer in the near-wall region, but has little effect on the momentum transfer. This study provides references for the adoption of wall conditions in numerical simulation and near-wall treatment in combustion systems.
PAPER REVISED: 2022-04-12
PAPER ACCEPTED: 2022-04-15
  1. Jiang, X., et al., Direct numerical simulation of a non-premixed impinging jet flame, Journal of Heat Transfer-Transactions of the ASME, 129 (2007), 8, pp. 951
  2. Maruta, K., Micro and mesoscale combustion, Proceedings of the Combustion Institute, 33 (2011), 1, pp. 125-150
  3. Janetzke, T., et al., Time resolved investigations on flow field and quasi wall shear stress of an impingement configurati on with pulsating jets by means of high speed PIV and a surface hot wire array, International Journal of Heat and Fluid Flow, 30 (2009), 5, pp. 877-885
  4. Xu, S.T., et al., Effects of wall temperature on methane MILD combustion and heat transfer behaviors with non-preheate air, Applied Thermal Engineering, 174 (2020), 25, pp. 115282
  5. Ranga Dinesh, K.K.J., et al., Analysis of impinging wall effects on hydrogen non-premixed flame, Combustion Sciences and Technology,184 (2012), 9, pp. 1244-1268
  6. Jiang, J.Y., et al., A study of instabilities in hydrogen-air impinging jet flames using two and three dimensional direct numerical simulations, Energy Procedia, 66 (2015), pp. 325-328
  7. Zhang, X.L., et al., Experimental study on flame morphologic characteristics of wall attached non-premixed buoyancy driven turbulent flames, Applied Energy, 254 (2019), pp. 113672
  8. Pan, K. L. Flame propagation with hydrodynamic instability in vortical flows, Journal of Mechanics, 24 (2008), pp. 3
  9. Jiang X. et al., Dynamics and structure of transitional buoyant jet diffusion flames with side-wall effects, Combustion and Flame, 133 (2003), 1-2, pp. 29-45
  10. Foucher, F., et al., Flame wall interaction: effect of stretch, Experimental Thermal and Fluid Science,27 (2003), 4, pp. 431-437
  11. Halouane Y., et al., Turbulent heat transfer for impinging jet flowing inside a cylindrical hot cavity, Thermal Science, 19 (2015), 1, pp.141-154
  12. Geikie M.K., et al., Turbulent flame-vortex dynamics of bluff-body premixed flames, Combustion and Flame, 223 (2021), pp. 28-41
  13. Yan, Y.F., et al., Numerical study of effect of wall parameters on catalytic combustion characteristics of CH4/air in a heat recirculation micro-combustor, Energy Conversion and Management, 118 (2016), 15, pp. 474-484
  14. Chen, G.B., et al., Effects of catalytic walls on hydrogen/air combustion inside a micro-tube, Applied Catalysis A-General, 332 (2007), 1, pp. 89-97
  15. Gollapudi, L., et al., Heat enhancement analysis of a differentially heated inclined square enclosure filled with Al2O3 nanofluids under three base fluids: Water, water-ethylene glycol mixture & ethylene glycol. Thermal Science, 25 (2021), pp. 269-269
  16. Tang, F., et al., Effect of sidewall on the flame extension characteristics beneath a ceiling induced by carriage fire in a channel, Combustion and Flame, 223 (2021), 4, pp. 202-215
  17. Bhaganagar, K., et al., Effect of roughness on wall-bounded turbulence, Flow Turbulence and Combustion, 72 (2014), 2-4, pp. 463-492.
  18. Rostamy, N., et al., The effect of surface roughness on the turbulence structure of a plane wall jet, Physics of Fluids, 23 (2011), 8, pp. 5
  19. Essel, E.E., et al., Roughness effects on turbulent flow downstream of a backward facing step, Flow Turbulence and Combustion, 94 (2015), 1, pp. 125-153
  20. Hilo, A.K., et al., Effect of corrugated wall combined with backward-facing step channel on fluid flow and heat transfer, Energy, 190 (2020), 1, pp. 116294
  21. Li H., et al., A study of the influence of coflow on flame dynamics in impinging jet diffusion flames, Journal of Turbulence, 22 (2021), 8, pp. 461-480
  22. Adamczyk, W.P., et al., Application of LES-CFD for predicting pulverized-coal working conditions after installation of NOx control system, Energy, 160 (2018), 1, pp. 693-709
  23. Payri, R., et al., The potential of Large Eddy Simulation (LES) code for the modeling of flow in diesel injectors, Mathematical and Computer Modelling, 52 (2010), 7-8, pp. 1151-1160
  24. Pierce, C.D., et al., Progress-variable approach for large-eddy simulation of non-premixed turbulent combustion, Journal of Fluid Mechanics, 504 (2004), 1, pp. 73-97
  25. Peters N., Laminar Diffusion Flamelet Models in Non-Premixed Turbulent Combustion, Progress in Energy and Combustion Science,10 (1984), 3, pp. 319-339
  26. Smith, G. P., et al., GRI-Mech 3.0. (1999)
  27. Tu, Y.J., et al., Numerical study of H2O addition effects on pulverized coal oxy-MILD combustion, Fuel Processing Technology, 138 (2015), pp. 252-262
  28. Subhash, C., et al., Flame impingement heat transfer: A review, Energy Conversion and Management, 46 (2005), 18-19, pp. 2803-2837.