Aerodynamics of Tsuji Burners with Augmented Fuel Injection

Tsuji burners, in which flames may be anchored the forward stagnation region of a cylindrical porous fuel injector placed uniform air stream, are addressed here for moderately large Reynolds numbers. Attention is focused on conditions under fuel-injection velocity not sufficiently small compared with outer boundary layer to remain attached part cylinder surface. In resulting flow, flame embedded thin mixing that forms at surface separating stream from both having, general, different densities. The flow side potential, while usually rotational because exit injection generate vorticity, example, by imposing requirement must emerge normal surface, condition analyzed herein. It shown introduction suitably density-weighted function reduces problem constant-density density-square-root-weighted ratio free-stream Λ emerging as only controlling parameter. numerical solution, involving determination vorticity distribution inviscid through an iterative scheme, provides structure including mixing-layer location and inviscid-flow strain rate there. Numerical results presented values ranging (Λ≪1) (Λ≫1) velocities. limit vanishingly velocities (Λ approaching zero) demonstrate that, unlike prediction potential-flow when fuel-side never approaches classical solution corresponding potential around solid (Λ=0), result affecting interpretation analyses experiments stabilized burners blown off. particular, streamline oxidizer regions lies farther larger near-quiescent wake lower along streamline.