A Numerical Study on Premixed Bluff Body Flame of Different Bluff Apex Angle

Abstract

In order to investigate effects of apex angle (α) on chemically reacting turbulent flow and thermal fields in a channel with a bluff body V-gutter flame holder, a numerical study has been carried out in this paper. With a basic geometry used in a previous experimental study, the apex angle was varied from 45° to 150°. Eddy dissipation concept (EDC) combustion model was used for air and propane premixed flame. LES-Smagorinsky model was selected for turbulence. The gird-dependent learning and numerical model verification were done. Both nonreactive and reactive conditions were analyzed and compared. The results show that asαincreases, recirculation zone becomes bigger, and Strouhal number increases a little in nonreactive cases while decreases a little in reactive cases, and the increase ofαmakes the flame shape wider, which will increase the chamber volume heat release ratio and enhance the flame stability.

Technical research and development

“…In the recent period, more and more attention has been paid to studies of various aspects of combustion processes and the design of appropriate burner devices [474][475][476][477][478][479][480][481][482][483][484][485][486][487][488]. Among the various types of burners, microjet burner devices can be distinguished, in which combustion is carried out by crushing the ignition torch into separate micro flame.…”

“…The available publications devoted to this topic touch on only certain aspects of the operating processes of the considered burner devices and by no means exhaust the needs of their design and operation. At the same time, CFD modeling is used as a research method in a number of papers, with the help of which detailed field information on the characteristics of the combustion process can be obtained [484][485][486][487][488].…”