空化射流型单倾角叠片式清洗器流场模拟与结构优化
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摘要
针对石油化工输油管道的清洗问题设计了基于射流空化的清洗器,为了解决清洗器在不同管径下如何设计的问题,通过Fluent模拟,对射流空化型叠片式清洗器流场进行研究。以管径70 mm的叠片式清洗器结构为基础,对管径改变时清洗器结构尺寸设计分别以等比例缩放和等间隙进行模拟研究。通过分析2种情况下管径改变后的压力场和气相分布,发现在等比例缩放时,空化长度随管径等比例变化,此时管径50、60、70、80和90 mm的清洗器产生的对应的空化区域长度分别为12、14、16、18和20 mm;控制间隙不变时,清洗器产生的空化长度随管径的增加先增大后减小,当管径为50、60、70、80、90 mm,空化长度分别对应为14、14、16、19和15 mm。本研究结果可为实际应用设计提供依据:当管径小于70 mm时应控制间隙不变,管径大于70 mm时可选择等比例缩放设计,可获得更好的空化效果。
A cleaning device based on jet cavitation is designed for the cleaning of petrochemical pipelines. In order to design the washer under different diameter, the flow field of jet cavitation type cascade washer is studied by Fluent simulation. Based on the structure of a stack of sheet type cleaners, the size design of the cleaner is studied with equal scale and equal gap, respectively, when the diameter of the pipe is changed. By analyzing the pressure field and gas phase distribution when the tube diameter changes in two cases. It is found that the cavitation length varies with the diameter of the tube, and the length of the cavitation region corresponding to the tube diameter 50, 60, 70, 80 and 90 mm is 12, 14, 16, 18 and 20 mm, respectively. And the control gap cavitation length increases to the maximum and then decreased with the tube diameter, 50, 60, 70, 80 and 90 mm corresponds to cavitation length 14, 14, 16, 19 and 15 mm respectively. Therefore, when the pipe diameter is less than 70 mm, the gap should be controlled invariant and the size of cleaner can be selected by proportionally scaling when the pipe diameter is greater than 70 mm. It provides a basis for application of design in practice.
A cleaning device based on jet cavitation is designed for the cleaning of petrochemical pipelines. In order to design the washer under different diameter, the flow field of jet cavitation type cascade washer is studied by Fluent simulation. Based on the structure of a stack of sheet type cleaners, the size design of the cleaner is studied with equal scale and equal gap, respectively, when the diameter of the pipe is changed. By analyzing the pressure field and gas phase distribution when the tube diameter changes in two cases. It is found that the cavitation length varies with the diameter of the tube, and the length of the cavitation region corresponding to the tube diameter 50, 60, 70, 80 and 90 mm is 12, 14, 16, 18 and 20 mm, respectively. And the control gap cavitation length increases to the maximum and then decreased with the tube diameter, 50, 60, 70, 80 and 90 mm corresponds to cavitation length 14, 14, 16, 19 and 15 mm respectively. Therefore, when the pipe diameter is less than 70 mm, the gap should be controlled invariant and the size of cleaner can be selected by proportionally scaling when the pipe diameter is greater than 70 mm. It provides a basis for application of design in practice.
引文
[1]李晓东,李勃,赵军强.空穴射流清洗技术在油田除垢中的应用研究[J].科技创新导报,2009(26):107-108.
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[8]张美霞,马文琦,孙红镱,等.双折弯叶片式空化射流清洗器流场数值分析[C]//第九届全国流体传动与控制学术会议(9th FPTC-2016)论文集.杭州:中国机械工程学会流体传动与控制分会,2016.
[9]张美霞.叶片式空化射流清洗器的结构参数设计及数值仿真研究[D].大连:大连海事大学,2017.
[10]姜艳威.油田管道空穴射流清洗工艺数值模拟与实验研究[D].哈尔滨:哈尔滨理工大学,2012.
[11]MA W Q,XIAO Z Y,ZHANG M X,et al.Numerical simulation of cavitation washer in pipe cleaning[C]//2015International Conference on Fluid Power and Mechatronics.Harbin,China:IEEE,2015:734-738.
[2]EDWARDS M.Controlling corrosion in drinking water distribution systems:a grand challenge for the 21st century[J].Water Science&Technology,2004,49(2):1-8.
[3]全先成,冯超.高压水射流技术在向家坝深井泵房排水管道清洗中的应用[J].水力发电,2013,39(7):58-60,106.
[4]刘庭成.高压水射流技术及其在清洗中的应用[J].洗净技术,2003(1):29-32.
[5]肖志勇.空化射流清洗器在管道清洗中的数值仿真及实验研究[D].大连:大连海事大学,2016.
[6]刘君明.油田管道清洗方法的研究现状[J].过滤与分离,2015,25(3):44-46.
[7]郑宏杰.国内外输油(气)管道清洗技术综述[J].科技与生活,2012(11):166-167.
[8]张美霞,马文琦,孙红镱,等.双折弯叶片式空化射流清洗器流场数值分析[C]//第九届全国流体传动与控制学术会议(9th FPTC-2016)论文集.杭州:中国机械工程学会流体传动与控制分会,2016.
[9]张美霞.叶片式空化射流清洗器的结构参数设计及数值仿真研究[D].大连:大连海事大学,2017.
[10]姜艳威.油田管道空穴射流清洗工艺数值模拟与实验研究[D].哈尔滨:哈尔滨理工大学,2012.
[11]MA W Q,XIAO Z Y,ZHANG M X,et al.Numerical simulation of cavitation washer in pipe cleaning[C]//2015International Conference on Fluid Power and Mechatronics.Harbin,China:IEEE,2015:734-738.