共查询到19条相似文献,搜索用时 187 毫秒
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脉冲清灰系统是袋式除尘器和电袋除尘器的关键技术之一。通过理论估算的方法确定系统关键参数的初值,并依靠在脉冲喷吹试验平台试验的方法来获得最优的设计参数。 相似文献
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以WINDOWS2000操作系统和通用CFD软件FLUENT为基础,研究构建了不同的并行计算硬件平台的方法,计算了典型的山谷污染物扩散过程的湍流流场。通过对SMP、MMP两种并行处理方法的分析,研究了并行计算方法的优缺点。结果表明:尽管MMP平台比务件相当的SMP平台并行计算效率偏低,但具有相当高的效费比,在环境、污染相关问题的CFD计算中极具应用前景。 相似文献
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同一产品用在不同的两个平台上能否同时满足这两个平台的使用要求,将两个平台结合起来进行可靠性增长试验设计可以回答这个问题,并且有利于节约经费,减少时间成本。该电子产品在平台A和平台B任务不同,可靠度非常接近。在剖面设计过程中,关于两个平台的温度、湿度、电应力的设计在相同的,振动应力将两个平台结合起来设计,振动应力取结合任务时间内在两个平台上的振动极大值包络。当增长模型未知,总试验时间采用指数分布的定时截尾方案。采用QJ3217-2000中没有增长模型的可靠性增长试验方法对试验结果的可靠性下限进行评估。最后对于多平台应用的产品,将多个平台结合起来进行可靠性增长摸底试验是可行的,符合我国的国情,易于被设计师接受。 相似文献
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物质流分析是研究循环经济的重要方法,本文面向资源循环的流程制造企业,对不同复杂度的物质流系统进行了建模方法研究。首先对国内外在物质流领域的建模理论研究进行了综述,然后对物质流的特点和循环物质流的建模方法进行了分析,对基于投入产出表格的物质流分析方法、理论层面基于图论的物质流分析方法以及物质流分析软件进行了综述,最后重点探讨了Petri网建模与仿真工具在循环物质流分析中的建模方法,研究了不同类型Petri网在解决不同复杂度的物质流系统问题中的适用性,为物质流建模与仿真提供理论支撑。 相似文献
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Mohamed Ahmed Reda Hamed 《环境质量管理》2023,32(3):203-208
Due to its simplicity and accurately measuring the flow rate, the venturi system is a special kind of pipe that is widely used in various applied fluid mixtures. One of the venturi system's important applications is ejectors devices that accurately facilitate adding air to water to sustain oxygen demand target levels in many waterworks engineering systems. This study aims to improve venturi system measurement accuracy through experimental investigation and analytical analysis for the venturi system conditional configuration parameters effect on target aeration operational efficiency. In the experiment work, different runs are implemented to characterize the performance of such aerators by describing the impact of venturi characteristics and configurations, including water flow rate, air inlets orifices diameters, inlet velocities, throat lengths, inlet angles, outlets angles, and outlet diameters on aeration efficiency. Results show that the venturi air vent diameter is an important governing parameter for determining aeration performance value. Additionally, an indicated increase in aeration performance with an increasing throat length to its diameter ratio. Meanwhile, the results revealed a varying noted effect of the venturi system characteristics and configurations on aeration performance. Moreover, the equations that relate venturi system configuration and Reynolds numbers with the aeration operational performance are developed to facilitate the target accurate aeration efficiency estimation. 相似文献
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潜流人工湿地在景观水系水质维持中的应用 总被引:2,自引:0,他引:2
以上海金地格林世界高尔夫公园生态景观水体水质维持系统工程为例,探讨了建立以FILSYS潜流人工湿地工艺为核心的住宅区生态景观水体水质维持系统,以及FLSYS潜流人工湿地工艺的应用特点和效果,并对其经济效益进行了分析。 相似文献
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Chih‐Heng Tsai Chang‐Tai Tsai 《Journal of the American Water Resources Association》2000,36(5):1075-1086
ABSTRACT: A mathematical model to predict both velocity and concentration distributions for sediment‐laden open channel flow is developed. Velocity profiles are derived by theoretical analysis and numerical method. Logarithmic law and semi‐empirical wake function concept are not adopted. An empirical equation for the ratio of sediment exchange and fluid diffusion coefficients is considered to solve the diffusion equation for suspended‐sediment concentration profiles. Four sets of experimental data from previous researchers are compared to numerical calculation. In the engineering applications, velocity and concentration profiles of sediment‐laden flow can be predicted simultaneously by the present model with the measured velocity and sediment‐concentration at reference level. 相似文献
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ABSTRACT. Studies to determine frequency characteristics of regulated streams at points within a stream system require the use of flow routing models. This study compares several different flow routing methods using data from six river reaches. Results indicate that approximate flow routing methods yield good flow estimates when compared with observed flows. The unit response method, recently introduced, performed as well as other approximate methods for all reaches studied and gave better results for reaches subject to power releases. 相似文献
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Wendy A. Rice Steven M. Gorelick 《Journal of the American Water Resources Association》1985,21(6):919-930
A graphical inverse method for determining the regional transmissivity distribution was applied to three field problems. The study areas were the Hanford Site, Washington; the Rocky Mountain Arsenal, Colorado; and the Nevada Test Site, Nevada. This method can aid in flow system conceptualization by revealing the location of bedrock controls for groundwater flow. It is a valuable tool for aiding the hydrogeologist in asking questions about the nature of trends in the pattern of transmissivity values. Quantitative estimates of regional transmissivities can be used as starting points for further parameter refinement. Sensitivity analysis using Monte Carlo simulation shows that quantitative estimates of transmissivity can be obtained when measurement error in the hydraulic head does not cause a large error in the hydraulic gradient. 相似文献
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Vladimir Novotny 《Journal of the American Water Resources Association》1980,16(6):1057-1065
ABSTRACT: Delivery of sediment and particulate pollutants from diffuse sources is shown to be related to the loss of sediment carrying energy of runoff during the overland flow phase. The loss is caused by the termination of rainfall and by reduction of flow energy during the recession phase of the overland flow hydrograph. It has been demonstrated both by theoretical analyses and experimental measurements that the saturated sediment concentration in overland flow is a function of rainfall erosivity and the runoff flow rate. The hypotheses were verified by field measurements from a small homogeneous watershed. 相似文献
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介绍了中心平台油气处理工艺、清除采出砂的必要性和要求。论述了地面集输系统的除砂方法以及中心平台除砂工艺,评价了除砂方法和工艺的优、缺点。供海上油田作业时借鉴。 相似文献