Flame–turbulence interactions during flame acceleration using solid and fluid obstacles

A combination of solid and transverse jet obstacles is proposed to trigger flame acceleration deflagration-to-detonation transition (DDT). numerical study this approach performed by solving the reactive Navier–Stokes equations deploying an adaptive mesh refinement technique. detailed hydrogen–air reaction mechanism with 12 species 42 steps employed. The efficiency mechanisms combined on are investigated comprehensively. effects multiple jets, start time, stagnation pressure DDT process studied. Results show that there a 22.26% improvement in run-up time 33.36% reduction distance for compared having only obstacles. acts as obstruction producing suitable blockage ratio introducing intense turbulent region due Kelvin–Helmholtz instability. This leads dramatic flame–turbulence interactions, increasing surface area dramatically. dual produces mushroom-like vortices, leading significantly stretched front intensive instabilities, therefore, these features produce high acceleration. As operation decreases, obstacle almost changes its role from both physical turbulence vorticity generator ratio. There moderate reduces detonation obstacle-laden chamber. While further pressure, it does not have positive effect shortening transition.