共查询到19条相似文献,搜索用时 156 毫秒
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利用CFD数值分析对风机2种结构扩散器进行了多工况运行的数值模拟计算,介绍了利用计算流体力学进行数值计算的求解方法,分析了2种结构扩散器的运行效率。为采用CFD方法分析流体内部流动问题提供了参考,为轴流式风机扩散器的研究与效率提高提供了数值实验依据。 相似文献
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扩散芯筒出流速度分布直接影响扩散器入口速度分布,进而影响主扇运行效率.根据工程现场情况,在扩散芯筒外筒体角度为2.1°~5.5°的范围内,和在扩散芯筒整流体角度为2.5°~6.0°的范围内,建立了多个矿井主扇扩散芯筒的物理模型.根据扩散芯筒出流平均速度,建立了扩散芯筒入口速度赋值公式,利用自定义函数初始化了入口速度边界.在扩散芯筒出流平均速度为6.0~10m/s范围内,利用Fluent数值模拟软件包,借助可实现κ-ε两方程湍流模型,进行了扩散芯筒多工况数值模拟.扩散芯筒数值模拟结果表明,就扩散芯筒出流速度分布而言,整流体角度的影响作用大于外筒体角度;在扩散芯筒整流体角度6.0°的优化情况下,随着外筒体角度增加和来流速度增大,扩散芯筒出流速度分布均匀度逐渐变差. 相似文献
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主扇扩散器流速分布模拟与动压损失研究 总被引:3,自引:0,他引:3
矿井主扇扩散器是用来降低出口动压以提高风机静压而回收风机出口动能的装置。根据流体动力学理论 ,本文就扩散器流场和速度场问题 ,应用计算流体动力学 (CFD)的方法模拟了 6 0°倾斜扩散器和流线型扩散器的风流流场和速度场 ,其重点分析了扩散器出口断面流速分布及出口动能损失的计算方法 ,对研究扩散器的最优设计参数及通风节能有较大的指导作用。 相似文献
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矿井主要通风机扩散器结构形式及其性能评价 总被引:4,自引:0,他引:4
扩散器是矿井主要通风机能量回收装置,扩散器结构形式与风机的能量损失有密切关系,而扩散器的结构阻力大小与其内部的流场有关。根据流体力学、空气动力学、计算流体动力学和实验流体力学等相关理论,借助重整化群湍流模型建立了扩散器内风流流动的数学模型,基于工程实际给定计算边界条件,并利用计算流体动力学手段分析了不同结构形式的扩散器内风流流场及其结构阻力,其结果与现场情况基本一致。由此,得出了不同结构形式扩散器与扩散器结构阻力损失的关系,揭示了实现扩散器节能降耗的流体力学机理。 相似文献
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基于边坡特征的矿山台阶边坡破坏类型及规模分析 总被引:1,自引:0,他引:1
台阶边坡破坏是矿山边坡破坏的最主要形式,台阶边坡的稳定性不仅受到结构面的分布和产状影响,而且边坡破坏规模还与台阶边坡的几何特征有很大的关系。通过分析岩质边坡的几何特征,总结出台阶宽度最大的边坡是决定边坡破坏规模的决定性因素,而最大宽度的坡脚则是最大的制约点,由制约点决定不同破坏规模的边界条件,并得到了不同台阶破坏规模的边界条件。与传统的台阶边坡定性分析相比,改进的方法不仅得到了台阶边坡的破坏形式,同时还得到了相应破坏的规模;便于抓住影响矿山台阶边坡的主要结构面或者结构面组合,根据可能的破坏规模来确定需要进一步分析计算的破坏形式,为评估边坡破坏的影响范围提供了定性的依据,并为稳定系数的计算提供了目标;提高了岩质边坡稳定性分析计算的效率,为矿山的安全生产提供指导和依据。 相似文献
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为了更有效地进行烟气脱硝改造工程,研究了SCR脱硝系统内不可逆能量损失分布情况。以某电站SCR系统为研究对象,进行数值模拟与熵产计算,建立系统内熵产分布场,综合考虑熵产分布和传统流场优化理论,以期更有针对性地对系统进行改造,减少工程量。研究表明,烟道转弯、渐扩处,以及导流板附近熵产较大。优化后可以减少SCR系统内能量损失,完成工程目标。 相似文献
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Based on the boundary condition of field engineering, numerical simulations of 28 conditions of existing diffusers of 3 structure
types were investigated by Computational Fluid Dynamics software package, and there were the problems of larger structure
resistance and lower diffusing efficiency of these diffusers by analysis of CFD results. The structure outlines of the energy-saving
diffuser were constructed by the application of stream function and potential function superimposing. On the basis of numerical
simulations of energy-saving diffusers of 5 area-enlarging ratios, structural resistances and diffusing efficiencies of 5
energy-saving diffusers were comparatively analyzed, and the range from 2.00 to 2.31 of the rational area-enlarging ratio
of energy-saving diffusers was derived. The optimization area-enlarging ratio of the energy-saving diffuser was presently
2.28 through comparable analysis. From the above, the results show that the coefficient of performance of the energy-saving
diffuser is better than 3 existing diffusers. 相似文献
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Hongtoushan copper mine was studied by analyzing the type of heat source, the calculation method about thermal releasing in
stope, thermal transfer between rock and air, distribution of temperature in stope were formulated. With CFD (Computational
Fluid Dynamics, DFD) simulation and Fluent software, geometrical model of a stope was built, boundary conditions was initialized,
then the temperature distribution, velocity and pressure field, concentration of oxygen and CO2 of air were simulated. In order to validate the simulation result, the parameters of the stope were measured with meter,
and comparing with the data of simulation. The result shows that the data of measuring and simulating are compatible. According
to the distribution of temperature and velocity, some ways such as flow angle and flow velocity are put forward, simulation
and parameter optimization made also, a satisfied result is acquired. The conclusion can be used on ventilation designing
and stope improving.
Supported by National Scientific and Technological 11th Five-Year Plan of China(2006BAK05B04-03) 相似文献