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排序方式: 共有146条查询结果,搜索用时 15 毫秒
1.
fluent软件在通风工程中的应用 总被引:2,自引:2,他引:2
fluent是用于模拟计算流体流动以及热传导问题的CFD通用软件,广泛应用于工程领域和科学研究。介绍了fluent软件的基本特点,应用流体力学理论和方法,分析了解决通风领域工程问题的基本算法模型,并以巷道风流为例,利用该软件模拟了障碍物下的巷道流场。 相似文献
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在实验室建立系统模型的基础上,利用计算流体力学(CDF)软件Fluent对有害气体泄漏扩散过程进行了数值模拟,整个模拟计算过程的稳定性和收敛性均较好。研究结果表明:出口处的平均速度在迭代116次后达到稳定,迭代过程中的残差收敛标准为1e-5;流场中的速度分布较为明显,不同的颜色代表了不同的速度等高线,且流场中的最大速度为1.561256m/s,最小速度为0.021359m/s;获得模拟计算的最关键技术参数CO2浓度的空间分布,并与试验中的实测数据进行了对比,简单分析了产生误差的原因。研究对泄漏事故扩散趋势做出准确的预测,建立有针对性的应急救援预案,实施有效的现场控制,具有一定的科学参考价值。 相似文献
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基于Fluent的气固喷射器三维数值模拟研究 总被引:1,自引:0,他引:1
根据CFD和仿真思想,采用标准k-ε湍流模型,并利用拉格朗日法和欧拉法相结合的三维数值模拟技术,对气固喷射器内的流场和颗粒行为进行了数值模拟研究。对固体颗粒采用了离散相模型,考察了气固两相间的相互耦合[1]作用,结果表明:在该喷射器的接收室中,喷嘴管道周围的一些无效区域内有颗粒的聚集和停留,流场的湍动能在喷嘴出口区域周围达到最大值。其主要原因在于,喷射器中心高速射流区域周围产生了明显的回流现象,固体颗粒的加入对气体流动情况产生了一定影响,气体流场随后逐步稳定。 相似文献
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C. Bhasker 《Advances in Engineering Software》2011,42(7):501-512
Flow simulation in inlet ducts along with several turning vanes used in electrostatic precipitator (ESP) are analysed to understand the flow pattern at its exit locations. The geometry of inlet duct has been extracted from the Plant Design Manufacturing System (PDMS) and refined with turning vanes placed at several locations. The domain of duct geometry around turning vanes are decomposed with several volumes and filled with hexahedral elements with the help of stat-of-art mesh generator - Hypermesh. The resulting computational grid has been used in TASCflow solver to predict its flow pattern in the duct. Simulation for the specified conditions predicts uneven flow distribution in the ESP inlet duct. Due to large flow recirculation and turbulent losses in the duct, non-uniform averaged mass flow rates are noticed at duct exit locations. Simulation results suggest that the improvement of flow distribution in the duct through optimization can be tried by placing more turning/splitter vanes in the inlet duct. In order to ensure that the results obtained from TASCflow are meaningful and in right direction, in the absence of measurement data, simulation was benchmarked with other industry standard commercial flow solvers. The observations made from these popular solvers confirm the findings obtained using the TASCflow solver. The analysis with multiple solvers indicates that Fluent provides quick results, while better visualization can be made using CFX solver. The Star-CD solver, which captures the turbulent losses accurately takes more time for convergence provides alternatives. 相似文献
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设计一种高效率的热声制冷机谐振管,采用Fluent流体软件对比渐扩管、直管、渐缩管中的压力,发现渐缩管具有增压作用。设计了1/4波长的谐振管,并调节其声腔使其达到纵向谐振频率状态,以便提高热声制冷机的效率。 相似文献
9.
文章分析了某型发动机在外场点火试车试验中,发动机到达一定的转速后,发动机转速增加缓慢,伺服阀可能产生的原因.重点从系统油压波动、油液温度、液流流态等方面对伺服阀进行了分析. 相似文献
10.
Twisting is one of the most important steps in the yarn spinning, which influences the geometry of spinning triangle and determines the properties of spun yarns. Airflow is one of the most important measures on improving yarn spinning. In this paper, a kind of air nozzle with vortex guiding channel was designed and used on the modification of ring spinning system, and the spun yarn qualities was studied by analyzing the airflow field in the nozzle. Firstly, the three-dimensional physical model of nozzle was given using CAD software according to the geometrical size of the practical nozzle model. Then, the numerical simulations of the three-dimensional flow field in the nozzle were given using Fluent software. Finally, two different kinds of yarns 10Ne and 20Ne were spun in the modified ring spinning system with the nozzle installed. The airflow pressure 0.01 Mpa and two different swirling directions, anticlockwise and clockwise, were chosen. The qualities of spun yarns, hairiness, strength, evenness, and number of snarling were measured and analyzed. It is shown that the high vortex airflow can be produced in the nozzle, and then corresponding twist can be produced. For the Z(S) twisting spun yarn, under the effects of the clockwise (anticlockwise) vortex airflow, the pre-twisting would be produced and the yarn twist can be strengthened, while under the effects of the anticlockwise (clockwise) vortex airflow, the untwisting effect would be produced, and the yarn twist can be decreased. 相似文献