非稳态流动突缩管流场与阻力特性研究

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• 英文论文题名：Flow field and pressure drop of unsteady flow in sudden contraction channels
• 论文作者：庄乃亮 ; 谭思超 ; 袁红胜 ; 杨博男
• 英文论文作者：ZHUANG Nai-liang ; TAN Si-chao ; YUAN Hong-sheng ; YANG Bo-nan ; Fundamental Science on Nuclear Safety and Simulation Technology Laboratory ; Harbin Engineering University
• 年：2015
• 作者机构：核安全与仿真技术重点学科实验室;
• 论文关键词：非稳态流动 ; 突缩 ; 阻力特性 ; 流场分布
• 英文论文关键词：unsteady flow ; sudden contraction ; pressure drop ; flow field
• 会议召开时间：2015-09-21
• 会议录名称：中国核科学技术进展报告（第四卷）——中国核学会2015年学术年会论文集第2册（核能动力分卷（上））
• 语种：中文
• 分类号：U664.15
• 学会代码：EGVD
• 会议名称：中国核学会2015年学术年会
• 会议地点：中国四川绵阳
• 主办单位：中国核学会
• 学会名称：中国核学会
• 页数：7
• 文件大小：789k
• 原文格式：O
• 会议级别：全国

摘要

针对非稳态流动条件下矩形截面对称突缩管内流场分布与阻力特性进行了实验研究。采用粒子图像测速法(PIV)获得了简谐脉动流水平突缩管(突缩比2)瞬时流场分布信息,实验参数范围:300The flow field and resistance characteristics in sudden contraction channel of unsteady flow were investigated experimentally by 2D particle image velocimetry(PIV).Contraction ratio(upstream to downstream area ratio) of 4 and 2 were selected comparatively for the study.The instantaneous two dimensional velocity profile and flow resistance were obtained.The results of unsteady flow were compared with those of steady flow with the Reynolds number ranged from 300 to 7500,based on the upstream hydraulic diameter.The time averaged pulsatile pressure drop of sudden contraction channel is larger than that of steady flow in laminar-turbulent transition region,and the ratio of the former to the latter has positive correlation with pulsatile amplitude while the ratio is insensitive to the pulsatile frequency.The flow visualization shows that the size of corner eddy near the sudden contraction decreases with the acceleration increasing.It is the acceleration of pulsatile flow that intensifies the hydraulic loss of the sudden contraction.

引文

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