共查询到19条相似文献,搜索用时 171 毫秒
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介绍了电除尘器设计的基本过程,运用CFD流体分析软件对电除尘器的流场进行了分析,得到了流场分布的各相参数,并对除尘器结构进行了改进,分析比较了优化前后的结果,为工程中电除尘器的设计和流场的优化提供了理论依据,具有现实指导意义。 相似文献
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电厂SCR烟气脱硝系统流场的数值模拟 总被引:1,自引:0,他引:1
电厂SCR系统烟气流动情况会影响整个系统脱硝效果及系统运行.文章采用计算流体动力学(CFD)模型预测某600MW电厂选择性催化还原法烟气脱硝系统内的流场状态,分析其在锅炉最大连续蒸发量(BMCR)工况下,不同导流设计的流场情况.使用GAMBIT构造几何模型并划分网格,FLUENT6.0进行模拟计算.研究重点在对脱硝系统内不同的导流方法进行研究分析,最终针对某SCR系统自行设计导流装置,完成系统流场的优化,提高了系统的工作效率.研究结果对脱硝系统内的导流设计和改进提供了参考. 相似文献
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为了克服采用手工计算方法对脉冲气体激光器火花开关流场压力计算产生的误差大的问题和和对火花开关流场进行更加精确的计算,应用了计算流体动力学(CFD)软件Fluent的RNG k-ε湍流计算模块对脉冲气体激光器火花开关流场进行了模拟分析,得出了流场气流状态的三维仿真图形.计算出开关进出口压力损失,并依据此计算结果选用风机,实验结果开关气体流量达到了设计指标的106%,最高工作频率达到了设计指标的110%,完全满足了项目研究需要.证明应用CFD技术可以对复杂流场进行精确模拟计算,解决手工计算误差大的问题. 相似文献
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基于计算流体动力学(CFD)方法,应用流体仿真软件FLUENT对两种气液分离装置内部流场进行仿真研究,得到分离器内部流场速度分布规律和相分布规律,发现合理改变排气通道的直径,可以提高分离效率。同时分析比较了流场模拟结果,发现排气通道直径改变处存在涡流。 相似文献
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泵类产品CFD仿真分析中的一个重要内容是确定压差和流量,稳态流量分析的结果对泵体实际结构比较敏感。本文采用瞬态CFD分析方法,使用SolidWorks Flow Simulation仿真分析了某典型泵结构的流场,得到了压差-流量曲线,仿真分析结果与实验数据非常吻合。 相似文献
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超声速进气道流场的CFD数值仿真 总被引:5,自引:1,他引:4
进气道是航空推进系统的一个重要组成部分,进气道内的流场品质会显著影响发动机的性能.由于进气道内部流动的复杂性和其广泛的应用前景,进气道内的流动特性引起了人们广泛的关注.采用计算流体力学(CFD)方法,空间离散采用Harten-Yee的二阶迎风TVD格式,时间迭代采用隐式LU-SGS方法,数值求解Navier-Stokes(N-S)方程,对进气道内部流场进行了数值模拟,并研究了进气道内部流场的流场结构以及激波/边界层干扰问题.数值计算结果反映出了流场的基本物理现象,说明了所采用的研究方法是可行的.同时数值模拟结果对进气道的设计有一定的参考价值. 相似文献
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本文以计算流体力学(CFD)为基础,采用有限体积法,建立列车风道及车厢模型,对列车流场进行数值模拟,得到速度及温度场的分布.并对模型处理方法进行阐述,计算结果进行分析,进一步提出CFD技术在轨道车辆空调系统中的应用方向. 相似文献
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乙烯裂解炉反应管数学模拟新方法 总被引:8,自引:2,他引:8
综述了不同类型的乙烯裂解炉反应管数学模型,分析了各类模型的缺点。为此提出了一种进行反应管数学模拟的新方法。即应用CFD方法对反应管内流体流动、传热、传质及裂解反应过程,不经任何简化直接进行数值求解,得到了管内的流场、温度场和浓度场等详细信息。模拟计算得到了反应管长度方向上的温度、速度、压力和组分浓度的变化规律;在反应管径向上存在着明显的速度和温度分布,而组分浓度变化程度不如速度和温度明显;计算结果为提出结焦抑制方法提供了依据。 相似文献
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Monisha Mridha Mandal Christophe Serra Yannick Hoarau K. D. P. Nigam 《Microfluidics and nanofluidics》2011,10(2):415-423
Recent studies show that microfluidic devices are gaining importance as micromixer in chemical and bio-chemical analysis systems.
However, little attention has been paid to investigate chemical reactions such as polymerization reaction process in microreactors.
In the present study, numerical modeling of the free-radical polymerization of styrene was carried out in novel coiled flow
inverter (CFI) microreactor. The concept of CFI is based on the technique developed by Saxena and Nigam (AlChE J 30:363–368,
1984). This device is made up of helical coiled tube which is bent periodically to 90° at equidistant length. The CFD modeling
for polymerization reaction taking place in coiled tube reactor was also performed in order to understand the influence of
secondary flows on reactor performance for fluid flowing with very low flow rate. Its performance was compared with CFD results
obtained in a straight tube reactor having identical length and operating under the same process conditions. The results showed
that monomer conversion in the coiled tube reactor was higher than that of the straight tube reactor. Further work was carried
out in the novel CFI reactor to study the effect of diffusion coefficient and number of bends on different parameters such
as monomer conversion, number-average degree of polymerization (DP
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), and polydispersity indexes (PDI). It was found that the performance of CFI as reactor increased when the diffusion coefficients
of reactants was decreased. Thus, CFI was found to be an efficient microfluidic device for controlling the free-radical polymerization. 相似文献
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环己烷氧化环流反应器的数值模拟 总被引:2,自引:2,他引:0
本文针对环己烷空气氧化反应器的工艺条件,运用计算流体力学原理及CFD软件CFX5.6/5.7对工业生产实际中该环流反应器进行了数值模拟。考察了反应器内的流体流动情况及进气量对反应器整体气含率和表观液速的影响,并从流体力学原理的角度阐述了产生这种现象的原因。对指导工厂生产扩产、生产工艺的优化和新型环流反应器的开发等具有积极的意义。 相似文献
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Toshifumi Asano Yoshiaki Ukita Katsuhiro Matsui Masahiro Takeo Seiji Negoro Yuichi Utsumi 《Microsystem Technologies》2007,13(5-6):441-446
We proposed and fabricated a vertical micro reactor stack with vertical fluid flow operation for environment analysis, post-genome
analysis, gene diagnosis, and screenings of useful materials for pharmaceutical. This reactor is characterized as the simple
structure and new aspects of the vertical fluid transportation evoked by the use of the fluid filter with micro through-bores.
The lithographite, galvanoformung and abformung (LIGA) process using synchrotron radiation was applied for the fabrication
of the fluid filters. The computational fluid dynamics (CFD) simulation results suggested that the fluid can be held by the
fluid filter and easily transported by the pneumatic operation. It was also confirmed that the fluid flow velocity through
the filter was controlled by varying the loaded pressure around several kPa. Furthermore, it was expected that the fluid was
stirred and mixed when passing through the fluid filter. It was demonstrated that the proposed chemical reactor result in
a good performance of the vertical fluid flow operation and biochemical reaction. 相似文献
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《Control Engineering Practice》2003,11(1):93-101
The rotary kiln for chemical waste incineration is a poorly defined reactor, and is controlled in a feedback manner. To optimally control such systems, a well-structured database should be built to assist in the control in the feedforward manner. This concept has been explored through computational fluid dynamics (CFD) modelling as an off-line tool. CFD has been widely used in simulation and prediction of fluid flow and the related transport phenomena, but without link to process control. The generation of the CFD database and integration of the CFD predictions to the actual process control situation are discussed in this paper. 相似文献
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