Research of Solid Hydrocarbon Fuel Gasification Products Mixing with High-Enthalpy Gas Flux in Uniform Cross-Section Ducts

This paper presents the analysis of numerical simulation results for solid hydrocarbon fuel (SHF) gasification products mixing processes with subsonic high-enthalpy oxygen-containing gas (HEOG) flux in the uniform cross-section ducts. Mathematical model of mixing efficiency estimation for supersonic SHF gasification products jets with subsonic HEOG flux is developed based on numerical solution of a full system of Favre averaged Navier - Stokes equations for viscid, heat-conducting gas in 3D transient definition together with Transition SST turbulence model. Different methods of mixing process intensification are examined such as the number of SHF gasification products blast nozzles, SHF gasification products jet feed direction and pressure pulsations. The obtained results may be useful at preconceptual study phase for operating process efficiency estimation of gas mixture diffusion combustion in the uniform cross-section ducts. On the ground of parametric analysis by the developed mathematical model the most effective mixing process (η_mix = 0,9...0,95) is implemented when fuel-air equivalence ratio is over the range 0,5 to 1, relative dynamic velocity pressure is approximately 100 and the number of gas jets ratio to duct width is over the range of 3,6 to 5,0 piece/m. SHF gasification products jet feed direction can improve mixing efficiency up to 7...12% when pointed against HEOG flux at angle of 45° compared with perpendicular and 45° along the main flux direction. The pressure pulsations of SHF gasification products jet with frequency f < 15 kHz and relative amplitude А > 0,1 can improve mixing up to 10...15%.

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