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【中文摘要】 利用计算流体软件FLUENT建立了喷水室内喷嘴及喷嘴出口外部流场的三维数学模型。采用标准-湍流模型模拟了喷嘴内部及出口外部流场,并根据各种情况分析了喷嘴参数对流场速度分布、压力分布和出口速度的影响。结果表明,喷嘴的扩散角和扩散段尺寸对喷嘴及出口流场影响较大:喷嘴的扩散角直接影响喷嘴出口后液滴的方向和速度大小,并影响流场的湍流分布情况,影响流场的紊流区域分布,最终影响水滴与风流的热湿交换;扩散段尺寸影响流场压力分布,特别会产生负压区直接影响射流后液滴的状态。 【英文摘要】 It built a three-dimensional model of flow field of the internal and export of the nozzle in a spraying room, using the soft ware FLUENT. It simulated the flow field of internal and export of the nozzle by using the standard - model. and it analyzes the parameters affect to the velocity distribution,pressure distribution and the velocity of the exit various conditions. The results show that, the diffusion angle and the size of divergent section have a great influence with the exit flow field. As the diffusion angle has a direct influence to the droplets direction and value, and they also affect the turbulence intensity distribution, and finally affect the heat and mass exchange between the droplet and wind flow; The size of divergent section affects the pressure distribution of the flow field, especially it affects the state of the droplet directly with the negative pressure. 【中文关键词】 喷嘴; 雾化; 流场; 数值模拟 【英文关键词】 Nozzle; Atomization; Flow field; Numerical simulation