【作者】 彭峰；

【导师】 潘卫明； 王家楣；

【作者基本信息】 武汉理工大学 ， 流体力学， 2004， 硕士

【摘要】 叶轮机械内全三维粘性流的计算越来越受到国内外学者的重视，是当前国际范围内流体机械研究中的一个十分活跃的领域之一。论文介绍了国内目前在离心风机方面主动防磨和被动防磨的相关进展和最新的研究方法。论文还阐述了离心风机气固两相流防磨技术的最新情况。论文采用滑移网格技术计算了离心风机气流通过叶片定子的情况并研究气流经过定子后流场的变化情况。尤其对风机气固两相流进行重点模拟。对比试验数据，得到理想的结果。计算结果表明所选的湍流模型能够很好的反映离心风机气固两相流的情况。 本文在分析离心风机气固两相流动理论的基础上，从主动防磨角度提出了两种减轻风机磨损的方法：改造风机进气箱和改造风机叶轮。论文对改造风机进气箱减磨的方法进行了三个对比实验，分析了不同方法所采用的防磨损机理以及对风机叶轮叶片磨损的改善程度。论文采用商用CFD软件，利用RNGκ-ε湍流模型对离心风机内部流场进行了三维数值模拟。论文还对改造风机叶轮减磨的方法进行了气固两相流的CFD研究，分析了改造前后风机叶轮的内部流场和磨粒轨迹的变化。对比实验研究和CFD研究的结果表明，论文提出的两种减磨措施能有效地减轻风机的磨损，为风机的主动防磨提供了两种有力的方法。从而表明显示了CFD在方案筛选方面的高效和所耗资源少的优点，论文进一步表明完全可以采用商业软件对工程上应用的一些叶轮机械进行数值模拟和优化设计。更多还原

【Abstract】 The current demands for three dimensions viscous flow in turbo machinery are more and more treated. This thesis presents a computational study of the flow field generated in a centrifugal fan and how that flow field changes through the downstream stator vane. Specifically, the effect that the fan flow field had on the gas-solid two-phase flow in the centrifugal fan was studied. This thesis presents the results of computational simulations done in parallel with experimental simulations of the centrifugal fan flow field. In comparisons of computational predictions with experimental data, reasonable agreement of the two-phase flow and general trends were found. The computational predictions of the centrifugal fan flow indicated that the turbulence model under-predicted gas-solid two-phase flows.On the basis of analyzing the theory of gas-solid two-phase flow, the paper put forward two ways of lightening the erosion of centrifugal fan from the point of view of initiative preventing erosion: changing fan’s inlet and changing fan’s impeller. This paper made three contrast experiments on changing fan’s inlet, analyzed the preventing erosion theory of each experiment and the improvement degree of the erosion of fan’s impeller and vanes. Meanwhile, the paper simulated the inner three-dimensional flow field of centrifugal fan with RNG k-s model, using commercial CFD software ?FLUENT. This paper also made CFD researches on the means of changing fan’s impeller, analyzed the inner flow field of fan’s impeller and the change of particle’s track. The result of experiment research and CFD research indicated that two preventing erosion measures of centrifugal fan were able to lighten effectively the erosion of centrifugal fan. The paper offered two good ways for initiative preventing erosion of centrifugal fan.更多还原