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Three-Dimensional Modeling for Estimation of Hydraulic Retention Time in a Reservoir 总被引:2,自引:0,他引:2
Matthew G. Kennedy David P. Ahlfeld David P. Schmidt John E. Tobiason 《Canadian Metallurgical Quarterly》2006,132(9):976-984
A three-dimensional computational fluid dynamics model is used to estimate the hydraulic residence time for a portion of the Wachusett Reservoir in central Massachusetts. The basin under consideration has several major inflows and exhibits complex flow patterns. The basin is modeled using the FLUENT software package with particles used to track travel time in a steady-state flow field. A tetrahedral mesh with over 1.6 million cells is used with accurate depiction of basin bathymetry and inlet and outlet geometries. Modeling is performed to simulate behavior during a period when conditions are isothermal. It is determined that mean hydraulic residence time is 3–4?days; approximately half of what would be expected assuming strictly plug flow. The presence of a primary flow path, large scale eddies and stagnation zones contribute to the faster travel times. Reductions in inflow rates produce increased residence times and significant changes in flow patterns. 相似文献
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提出了一种快速极性相关算法,该算法利用标准8位微处理器具有的按位和处理8位数据的功能,采用了查表方式计算相关值,并以二分法进行峰值搜索。在Z8671单片机(晶振7.3728MHz)上执行该算法,允许的最高采样频率为18.08kHz。如果取相关计算长度为256点,测量窗口为127点,采样后只需10ms便可以给出流体流经距离L的渡越时间,从而使以微处器为核心的相关仪,可以满足实时应用的要求。 相似文献
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介绍了基于PC机、电子显示屏、RS485串口卡、Linx6800打印机等硬件及Visual Basic 6.0,Access等软件研制的实时生产数据采集及信息处理系统;客户端可以通过局域网络访问服务器获得生产信息从而了解生产情况. 相似文献
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建立了回转窑实验装置,通过冷态实验研究了回转窑转速、倾角、内径、窑尾挡料圈高度等操作参数和结构参数对物料停留时间的影响。结果表明,物料在回转窑内的停留时间分布近似正态分布;物料停留时间随着回转窑转速、倾角和内径的增大而缩短;窑尾挡料圈高度对物料停留时间影响较复杂,转速小于2.5 r/min时,窑尾挡料圈高度的增加使物料停留时间延长,而当转速大于2.5 r/min时,窑尾挡料圈高度的增加反而使物料停留时间缩短;在某一固定回转窑倾角时,物料停留时间与物料质量流率的乘积与单位转速内物料质量流率近似成线性关系。 相似文献
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介绍了连铸钢坯在环形加热炉内加热实际温度测试的设备和方法,以在包钢中的应用为例,分析了加热炉目前的加热效果,提出相应的改进意见,并探讨了数学模型控制和待轧策略。 相似文献