非定常噴流の雰囲気ガス導入に及ぼす噴射パラメータの影響 (<小特集>エンジンシステムの新展開)

概要

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In unsteady gas jets, the influence of gas injection conditions on ambient gas entrainment processes was evaluated by a LIFA (laser-induced fluorescence of ambient gas technique. The influence of injection nozzle diameter, D, the ratio of nozzle length to diameter, L/D, discharge velocity, u_m, kinematic viscosity of the gas jet, ν, specific gravity of the gas jet, ρ_j and of ambient gas, ρ_a was investigated. Experimental results show that the influence of injection conditions on the ambient gas entrainment processes correlates with the influence of both specific gravity ratio, ρ_j/ρ_a, and eddy kinematic viscosity, ν_t, whhch is calculated from the discharge turbulence intensity of jets. The discharge turbulence intensity increases with increase in u_m and with decrease in ρ_j, L/D, and D. The mean jet concentration, C_<jm>, which was calculated by averaging C_j over the whole jet, can be predicted approximately with only one parameter, (ρ_j/ρ_a)D^2/[(ν+ν_t)Δt].
一般社団法人日本機械学会の論文
1995-10-25