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抽水蓄能电站回水排气系统流场数值模拟 被引量:3
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作者 杨春霞 徐顶娥 +2 位作者 张振 胡雪原 耿魏强 《中国电机工程学报》 EI CSCD 北大核心 2022年第11期4069-4078,共10页
为研究抽水蓄能电站回水排气系统流场变化,基于SIMPLEC算法和Realizable k-ε湍流模型,对电站回水排气系统进行三维数值模拟,分析不同总管管径下排气系统排气过程中速度场、压力场的变化。结果表明,总管管径变化时对支管内的气体流场变... 为研究抽水蓄能电站回水排气系统流场变化,基于SIMPLEC算法和Realizable k-ε湍流模型,对电站回水排气系统进行三维数值模拟,分析不同总管管径下排气系统排气过程中速度场、压力场的变化。结果表明,总管管径变化时对支管内的气体流场变化较小,总管上气体的压力、速度都随着管径的增加而逐渐降低;总管管径从250mm增加到400mm时,管道内流量逐渐增加,管道流量从16.79kg/s逐渐增加到20.72kg/s,而管道内流速急剧降低,管内流速从215.99m/s降为112.37m/s;在管道交叉处,当总管直径较小时,气体进入总管时受总管管壁的约束作用比较大,气体对管壁的冲击力较小,随着总管直径的增加,气体对总管的撞击力迅速增加,气体流动更加复杂。随着管径的增加,支管截面plane1上的气体速度随着管径的增加呈现先增加后减小的趋势,最大流速出现在管径为300mm的工况下,为284.2m/s;支管与总管交叉处截面plane2上气体速度变化较小,最大流速出现在350mm工况下,为310.8m/s;总管截面plane3上气体速度变化逐渐增加,最高流速为362.3m/s,出现在管径为400mm的工况。 展开更多
关键词 抽水蓄能电站 回水排气系统 总管管径 数值模拟
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How to choose the most appropriate technique for the single-stage treatment of cholecysto-choledocolithiasis?
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作者 Aldo Bove Paolo Panaccio +4 位作者 Raffaella di Renzo Gino Palone Marco Ricciardiello Sara Ciuffreda Giuseppe Bongarzoni 《Gastroenterology Report》 SCIE EI 2019年第4期258-262,I0001,I0002,共7页
Background:We utilized transcystic clearance and intra-operative papillotomy through a rendezvous technique for the treatment of cholecysto-choledocolithiasis.The goal of this study was to evaluate the reliability of ... Background:We utilized transcystic clearance and intra-operative papillotomy through a rendezvous technique for the treatment of cholecysto-choledocolithiasis.The goal of this study was to evaluate the reliability of pre-operative parameters to address the most suitable surgical procedure.Methods:A total of 180 patients affected by calculi of the gallbladder and bile duct underwent the single-stage treatment.According to several pre-operative parameters,141 patients had to supposedly undergo transcystic clearance of the bile duct,while 39 patients had to be treated with the rendezvous technique.All patients were treated with the sequential procedure:first,we tried the transcystic procedure and,if there was a failure,we used a rendezvous technique.We prospectively analysed each group based on a series of variables such as sex,age,operative time,success rate of proposed treatment,conversion rate,post-operative complications and hospital stay.Results:Transcystic clearance was successful in 134 out of 141 patients(95.0%),while 2 patients needed to undergo a laparo-endoscopy procedure(failure).Thirty-five out of 39 patients(89.7%)obtained common bile-duct(CBD)clearance through the rendezvous technique,while 1 patient obtained clean-up through the simple transcystic procedure(failure).Five out of 141 patients with transcystic clearance and 3 out of 39 patients with the rendezvous technique underwent laparotomy CBD clearance with conversion rates of 3.5%and 7.7%,respectively.Post-operative complications showed similar percentages for both procedures.However,the surgical time turned out to be longer for the rendezvous technique.Conclusions:The one-stage procedure for the treatment of cholecysto-choledocolithiasis was possible in 94%of the cases utilizing a surgical technique selected according to the patient’s case history.The pre-operative parameters,such as jaundice,CBD diameters and stone diameters,have certified their reliability as good predictors of the most suitable procedure to follow. 展开更多
关键词 Common bile-duct stone transcystic laparoscopic bile-duct clearance laparoscopic common bile-duct exploration rendezvous intra-operative endoscopic retrograde cholangiography
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