Response of spherical diffusion flames subjected to rotation: Microgravity experimentation and computational simulation

Authors

Sean W. Yoo, Princeton University
Swetaprovo Chaudhuri, Princeton UniversityFollow
Kurt R. Sacksteder, NASA Glenn Research Center
Peng Zhang, Princeton University
Delin Zhu, Princeton University
Chung K. Law, Princeton UniversityFollow

Date of this Version

2012

Citation

Combustion and Flame 159 (2012) 665–672; doi:10.1016/j.combustflame.2011.07.013

Abstract

Microgravity experiments were conducted in the 2.2-s drop tower and zero-gravity facility at NASA-GRC to gain fundamental understanding of the effects of spinning on an otherwise spherical diffusion flame. The flames were generated by injecting either a fuel or an oxidizer mixture from a porous burner to a controlled ambient of either an oxidizer or fuel mixture, respectively. Results show that the polar flame location scales with the angular velocity monotonically as ω^a, where a is greater and smaller than unity for small and large spinning velocities, respectively. On the contrary, the equatorial flame location responds nonmonotonically to increasing spinning velocity: first increasing and then decreasing. The experimental observations agree well with the computational simulation where the simulated results demonstrate that the nonmonotonic response of the equatorial flame location is caused by dilution of the reactant concentration in the outwardly-directed radial flow by the product and inert that are carried by the inwardly-directed polar flow upon traversing the flame segment in the polar region.