摘要
在边界条件和初始条件相同的情况下,分别改变锥形扩压器的扩散角及渐扩管的长宽比,基于FLU-ENT软件和高性能集群对扩压器内流速的衰减特性及扩压性能进行了数值模拟及分析.研究结果表明:在渐扩管长宽比一定的情况下,渐扩管效率随着扩散角的增大先增大后减小;在扩散角不变的情况下,渐扩管效率随着渐扩管长宽比增大而增大.因此,用适当的扩散角或增大渐扩管长宽比的方法可得良好的压力恢复.关于并行计算,当核数目不变时,随着网格数量的增加,并行效率呈增加趋势但增大的幅度越来越小;当网格数不变时,随着核数目的增加,并行计算效率呈减小的趋势.本预测结果可为扩压器的优化设计及工程应用提供参考.
At the same situation of boundary and initial conditions,changes are made for diffusion angle of conical diffuserand aspect ratio respectively. Study on the performance of the conical diffuser has been made by using of the simulationbased on FLUENT software and cluster. The results show that when aspect ratio is certain,the efficiency of conical diffus-er first increases and then decreases with the increase of diffusion angle. When the diffusion angle is certain,the efficien-cy of diffuser is increasing with the increase of aspect ratio. Thus,good pressure recovery can be obtained with an appro-priate spread angle or increase the aspect ratio of the diverging tube method. For parallel computing,when the cores num-ber remains changed,the parallel efficiency is improved with an increase in the number of grids. When the grid numberremains the same,parallel computing efficiency shows a trend of decrease with the increase of the number of processorcores. The predicted results can serve as reference of diffuser for optimizing design and engineering applications.
出处
《南京师范大学学报（工程技术版）》
CAS
2016年第2期47-53,共7页
Journal of Nanjing Normal University(Engineering and Technology Edition)
基金
湖南省自然科学基金(14JJ2103)
湖南省重点学科建设项目(2012ZDXK012)
中南林业科技大学人才引进项目(104-0096)
关键词
FLUENT
扩压器
紊流
并行计算
压力恢复效率
FLUENT
diffuser
turbulent flow
parallel computation
pressure recovery efficiency
