Numerical study of a flame in a Kármán vortex street

✍ Scribed by Ilkka Karasalo; Izak Namer

• Publisher: Elsevier Science
• Year: 1982
• Tongue: English
• Weight: 828 KB
• Volume: 47
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(82)90105-5

✦ Synopsis

A numerical study of a simplified flow configuration modeling the interaction of a premixed laminar flame with a K~m~n vortex street is presented. The flow is assumed to be two dimensional, inviscid everywhere except inside the vortices, and incompressible everywhere except at the flame. The flame is modeled as a single layer source for the velocity potential with a burning speed which depends on the local curvature. Complete flow fields are calculated as a function of time for various values of the Markstein parameter, vortex shedding frequency, separation of the vortex street, the strength of the vortices, and the ratio of unburned to burned fluid densities, p u/p b. The velocity far upstream was set at 60 cm/s for all cases. The essential features of the interaction of a flame with a vortex street are demonstrated, including the deflection of the vortex street and streamlines ahead of the flame and the development of a flame brush. The results of the calculations show that predictions of the flame behavior are strongly dependent on the value of,o u/,O b. It was also found that the frequency of the vortex street, the phase relations as the vortices pass through the flame, and the strength of the vortices are important parameters in determining the behavior of the flame.