Combustion heat release effects on the dynamics of bluff body stabilized premixed reacting flows

Prashant Girdharilal Mehta, Marios C. Soteriou

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The physics of bluff body flameholder stabilized premixed combustion is investigated using the results of time dependent two-dimensional Lagrangian simulations. The Vortex Element Method is used to simulate the low Mach number compressible flow field while the reacting field is simulated using a kinematical flamesheet model. The numerical model is validated against nonreacting experimental data for shear layers - simulated by considering a thin bluff body with a velocity difference across it - and traditional bluff body flows. Results for the reacting bluff body flow indicate a shift in the solution from the Von Karman asymmetric shedding of coherent vortices at a characteristic frequency witnessed in the nonreacting flow, to a rather symmetric shedding that is not dominated by any single frequency. Analysis indicates that this shift is mainly due to the dilatation that accompanies the combustion heat release while baroclinic vorticity plays a supporting but secondary role. The dynamics in the near field of the flameholder (4-5 bluff body thickness downstream) is dominated by the vorticity generated at the bluff body walls. Further downstream vorticity generated by the baroclinic torque dominates the dynamics. The amount of the downstream baroclinic vorticity is strongly dependent on the presence of wall generated vorticity. The latter excites the flame in the near field thereby enhancing the conditions for baroclinic vorticity generation.

Original languageEnglish (US)
Title of host publication41st Aerospace Sciences Meeting and Exhibit
StatePublished - 2003
Externally publishedYes
Event41st Aerospace Sciences Meeting and Exhibit 2003 - Reno, NV, United States
Duration: Jan 6 2003Jan 9 2003

Other

Other41st Aerospace Sciences Meeting and Exhibit 2003
CountryUnited States
CityReno, NV
Period1/6/031/9/03

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering

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