首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到19条相似文献,搜索用时 46 毫秒
1.
采用计算流体力学技术,模拟了北京某水厂臭氧接触池中水的流态分布及水力效率。通过流体停留时间分布(RTD)的分析,得知臭氧接触池的T10 /HRT为0.466,短流现象明显,水力效率低。在臭氧接触池中增加导流板后,T10 /HRT值可提高20.38%,但T90 /HRT高达1.316,回流现象明显;设置横挡板,可将T10 /HRT提高15.88%,同时T90 /HRT降至0.821,RTD更为集中,流场更接近理想活塞流。因此,增加横挡板有利于臭氧接触池水力效率的提高。  相似文献   

2.
采用模拟系统设计臭氧接触池   总被引:2,自引:0,他引:2  
在介绍臭氧接触池类型的基础上,采用模拟系统进行了臭氧接触池的设计,列举了设计实例,并定量比较了扩散管式接触池及U型管(DUT)接触池的性能.  相似文献   

3.
计算流体力学(CFD)在二沉池优化设计中的应用   总被引:1,自引:0,他引:1  
对二沉池研究中常用的计算流体力学(CFD)数学模型进行了分类和归纳,介绍了数学模型的数值解法,讨论了水流模型中的动量源项和悬浮物模型中的传质源项,并分析了二沉池内水流运动、悬浮物传质过程的主要研究成果。总结了应用CFD优化二沉池结构、进口条件及效率的研究进展,提出了今后的研究方向。  相似文献   

4.
目前福州市区各自来水厂采用的为常规的水处理工艺,为了消除水源水质对供水水质造成的突变性、无法预测性的影响,本文介绍了在福州东南区水厂原有处理工艺基础上增加臭氧-活性炭工艺的应用情况,并反映出其对提高水厂运行稳定性的良好效果。  相似文献   

5.
徐昉 《建筑学报》2004,(8):65-67
介绍可持续设计和CFD的相关背景知识,阐明CFD应用于可持续设计的可行性,并且通过简要的介绍三个典型的在可持续设计中应用CFD的工程实例,展示这种计算机模拟技术的能力及其对于可持续设计的独特价值,以鼓励我国广大的从事可持续设计的实践者和研究者,充分利用CFD技术,以便提高可持续设计的实践和研究水平。  相似文献   

6.
臭氧/UASB/接触氧化处理医药废水   总被引:9,自引:0,他引:9  
医药废水是一种浓度高、可生化性差的难降解废水。采用臭氧/UASB/接触氧化工艺处理,调试及运行结果均表明,系统对BOD5和COD的去除率分别达到98.0%和97.0%以上,运行稳定,出水水质达到《污水综合排放标准》(GB 8978—1996)的二级标准,运行费用为3.21元/m3。  相似文献   

7.
对清水池实例通过数值建模和CFD模拟,研究几何参数对清水池水力效率的影响,分析了其分散指数、Pe数、体积效率和短路指数等,并探讨了清水池的设计方法。结果表明:清水池的长宽比对其水力效率(T10/t)影响明显,水力效率随长宽比的增加而增大,但增速趋缓,函数相关系数较高。当T10/t0.5时,长宽比需在30以上。清水池分散度低,平移是传质的主要因素。设计实例的水力效率为0.537,MDI为2.00,若长宽比为150,则T10/t高达0.70。  相似文献   

8.
给水厂深度处理工艺中的臭氧系统设计   总被引:2,自引:0,他引:2  
介绍了给水厂深度处理工艺中臭氧系统的设计,给出了相关的设计参数,供广大技术人员参考。  相似文献   

9.
徐丽  洪波 《中国给水排水》2014,(22):146-148
采用混凝沉淀/臭氧/接触氧化组合处理工艺对天津某制药厂废水进行处理,处理规模为500 m3/d,处理后的废水各项指标达到或优于天津市《污水综合排放标准》(DB 12/356—2008)三级标准。调试运行实践表明,该工艺选用合理、处理效率高、出水水质稳定可靠,还为后期的提升改造预留了一定的空间。  相似文献   

10.
11.
应用计算流体力学优化清水池水力效率   总被引:2,自引:0,他引:2  
为确定计算流体力学(CFD)用于清水池水力效率计算的可行性而建立了CFD中试模型,得到了清水池数学模型的液龄分布函数和累计液龄分布函数。改变模型流场设置,包括挡板数量、挡板长度、穿孔板和导流墙,分别建立相应的扩展数学模型对流场进行模拟和比较。通过对上述改进流场水力效率的措施进行整合,建立了四挡板和七挡板优化数学模型,明显提高了整个流场的水力效率,使得流场接近活塞流的理想状况。  相似文献   

12.
There are many ‘compelling possibilities’ for computational fluid dynamics (CFD) in architecture, as demonstrated by its successful adoption in the aerospace, automotive and product manufacturing industries. Sawako Kaijima, Roland Bouffanais, Karen Willcox and Suresh Naidu of ARCH-CFD, a research initiative at the International Design Centre established by the Singapore University of Technology and Design (SUTD) and the Massachusetts Institute of Technology (MIT), explore CFD's potential.  相似文献   

13.
14.
Recently in the UK, there has been significant interest in the design of combined sewer overflow chambers and storage tanks. This paper describes an extensive laboratory and computational fluid dynamics study into the hydraulic performance and sediment retention efficiency of tanks. The work has shown that (i) it is possible to predict the flow field which is measured in the laboratory using computational fluid dynamics, and (ii) a critical bed shear stress may be used to determine the extent of sediment deposition. Subsequently a bed shear stress model and the particle tracking routine in 'FLUENT'have been used to compare the sediment retention efficiency of eight different chamber designs. The results showed that the length to breadth ratio of the chamber was the most important parameter to influence sediment deposition, and that changes to the benching and longitudinal gradient of the tank had minimal effect.  相似文献   

15.
A good understanding of the hydraulic performance of aerated lagoons is required for their design and operation. A comprehensive numerical procedure has been developed for the three-dimensional computational modelling of the flow in large lagoons including high-speed floating mechanical surface aerators. This paper describes the procedure that consists of separate aerator modelling, then applying the obtained results as boundary data for a full lagoon model. A model application to an industrial aerated lagoon serves as an example of flow analysis. Post processing of the results by calculating the local average residence time (age of fluid) provides a powerful and intuitive technique to visualize and analyse the lagoon performance. The model has been verified by comparing the local average residence time predictions with measurements from a dye study. It is shown that the numerical modelling proposed is feasible and constitutes an effective new tool in improving the performance and design of industrial lagoons.  相似文献   

16.
目前建筑结构抗风研究方法主要有现场实测、风洞试验以及CFD数值模拟,虽然前两种方法得出的数据可靠、实用,但是试验周期长、代价昂贵等等这些因素一定程度上约束了它们在实际工程中的应用.CFD是近年来发展起来的一门新兴学科,已经被证实能有效的应用在建筑工程的风荷载模拟方面.文章较详细的介绍了CFD的原理,包括连续方程、运动方程以及N-S方程,并介绍了CFD软件FLUENT的计算流程.最后利用FLUENT软件以威斯汀中心为实例进行数值模拟,给出了表面风压系数、局部体型系数以及整体体型系数,并列出了最不利工况下体型系数.  相似文献   

17.
《Urban Water Journal》2013,10(8):631-640
This article describes a general method to assess discharge-water depth relationships for combined sewer overflow (CSO) chambers. This method is particularly suitable for: complex geometries, unavailable univoc relationship between upstream and downstream flow and complex downstream hydraulic conditions. The methodology presented in this article is based on computational fluid dynamics. Its aim is to propose a relationship between the water depths in the CSO chamber and the overflow discharge. This study focuses on the evaluation and integration of the uncertainties in the determination of the most suitable depth-overflow relationship. Uncertainties related to numerical model, boundary conditions and water depth have been taken into account in order to elaborate water depth-overflow rate relationship. This approach is illustrated through the example of the ‘Milan’ CSO of Mulhouse city, France.  相似文献   

18.
分析了计算流体动力学技术在室内气流组织设计中的主要作用,针对写字楼办公室选择了三种不同的气流组织方式进行了数值模拟,得出了此类建筑的最佳气流组织方式.  相似文献   

19.
Numerical studies of wind-driven rain (WDR), reporting detailed analysis of rain exposure on building facades, focus mainly on simplified building facades. However, small-scale facade details have a large impact on the rain exposure of a building, redistributing WDR locally. The present study reports results of computational fluid dynamics simulations with Eulerian multiphase (EM) model for WDR on a stand-alone mid-rise residential building. The influence of facade details, namely roof overhangs, balconies and window sills, is analysed. It is shown that even a very small surface detail, such as a window sill with a size of 0.10?m, can decrease catch ratio by up to 37% and droplet impact speed by up to 40%. Numerical simulations also show the practicality of the EM model for detailed analysis of WDR intensity on a complex building and its ability to be used as a design tool.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号