Numerical Simulation Of The Round Jet And The Impinging Stream

For its high carbon conversion rate (up to98%), high gasification efficiency andreliability, the Impinging Stream gasification furnace is widely used in IGCC power plant.It has been proved by experiments that the heat and mass transfer coefficients are highlystrengthened in the Impinging Stream. In addition, Impinging Stream can even be used inall kinds of chemical engineering processes, and this method is more efficiency and needless energy contrast to the traditional methods. In this paper, a single round jet nozzle aspart of multi-nozzle impinging stream was studied to explore fluid properties of the singleround jet. Based on these researches, we studied the group Impinging Stream services’ fluidcharacteristics in order to get more understanding of the Impinging Stream.Based on the FLUENT software, a single round jet nozzle is calculated. From thestatistics and mean field results, we obtained the following conclusions:(1) The LES model get better (compared with the experimental data) results whenused in gas and particle condition than the realizable k-ε and the RSM model, and can getthe best flow field of the round jet.(2) The length of the core area is get longer when the Reynolds number of the roundjet flow increased, so as the flow pulsation rate.(3) For the particle-laden round jet, we found that the presence of particles reducedthe average speed of gas flow and smaller particle St number have a stronger weaken effecton the fluctuating velocity of the gas flow field. In addition, particles are more likely to bedispersed in the fully developed jet when the St number is smaller.Also we got some conclusions of impinging stream based on calculations of theFLUENT software:(1) The mean-field flow get from Reynolds stress model is more consistent with PIVexperimental results than RSM model;(2) The radial velocity decay rate in impinging stream is much higher than the axialvelocity decay rate in round jet.(3) The LES model get better results when calculating the instantaneous flow field ofimpinging stream is more similar with the actual flow field.