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所属单位：能源与动力学院

发表刊物：APPLIED SCIENCES-BASEL

关键字：gas turbine engine lean direct injection four-point low emissions combustion

摘要：To investigate the combustion characteristics in multi-point lean direct injection (LDI) combustors with hydrogen/air, two swirl-venturi 2 x 2 array four-point LDI combustors were designed. The four-point LDI combustor consists of injector assembly, swirl-venturi array and combustion chamber. The injector, swirler and venturi together govern the rapid mixing of hydrogen and air to form the mixture for combustion. Using clockwise swirlers and anticlockwise swirlers, the co-swirling and count-swirling swirler arrays LDI combustors were achieved. Using Reynolds-Averaged Navier-Stokes (RANS) code for steady-state reacting flow computations, the four-point LDI combustors with hydrogen/air were simulated with an 11 species and 23 lumped reaction steps H-2/Air reaction mechanism. The axial velocity, turbulence kinetic energy, total pressure drop coefficient, outlet temperature, mass fraction of OH and emission of pollutant NO of four-point LDI combustors, with different equivalence ratios, are here presented and discussed. As the equivalence ratios increased, the total pressure drop coefficient became higher because of increasing heat loss. Increasing equivalence ratios also corresponded with the rise in outlet temperature of the four-point LDI combustors, as well as an increase in the emission index of NO EINO in the four-point LDI combustors. Along the axial distance, the EINO always increased and was at maximum at the exit of the dump. Along the chamber, the EINO gradually increased, maximizing at the exit of chamber. The total temperature of four-point LDI combustors with different equivalence ratios was identical to the theoretical equilibrium temperature. The EINO was an exponential function of the equivalence ratio.

ISSN号：2076-3417

是否译文：否

发表时间：2017-06-01

合写作者：Yuan, Li,Mongia, Hukam C.

通讯作者：李建中