改性沥青搅拌罐涡轮搅拌器不同叶片安放角的影响分析
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摘要
为了提高搅拌设备内SBS改性沥青的搅拌混合效果,从而能够明显改善改性沥青的力学性能和感温性能,提高公路使用质量。由于SBS改性沥青混合属于固-液两相,通过采用计算流体软件CFD对不同叶片安放角下的开启涡轮搅拌器进行数值模拟,分析30°、45°、66°和四直叶涡轮搅拌器的速度矢量图和综合速度云图,并分别比较其不同涡轮搅拌器的轴向速度、径向速度和切向速度。研究结果表明,四直叶涡轮搅拌器搅拌流型以径向流为主,且产生双循环涡流,圆周带动能力强,混合效果较差; 30°、45°和66°斜叶涡轮搅拌器是以轴向流为主,且其速度最大值出现在搅拌器叶片端部。
In order to improve the mixing and stirring effect of SBS modified asphalt in the mixing equipment,increase the mechanical properties and temperature susceptibility of modified asphalt,the impeller of open turbine with different blade placement angles was numerically simulated by CFD software. Velocity vectors and integrated velocity nephograms of turbo stirrers with 30°,45°,66°and four straight blades were analyzed. Then the axial velocities,radial velocities and tangential velocities of these turbine stirrers were compared respectively. The results show that the mixing flow pattern of the four-blade turbine stirrer is mainly radial flow,and generates double-cycle vortex,which has strong circumferential driving ability and poor mixing effect. The inclined-blade turbine stirrer of 30°、45° and 66° are mainly axial flow,and the maximum velocity occurs at the stirrer blade tip.
In order to improve the mixing and stirring effect of SBS modified asphalt in the mixing equipment,increase the mechanical properties and temperature susceptibility of modified asphalt,the impeller of open turbine with different blade placement angles was numerically simulated by CFD software. Velocity vectors and integrated velocity nephograms of turbo stirrers with 30°,45°,66°and four straight blades were analyzed. Then the axial velocities,radial velocities and tangential velocities of these turbine stirrers were compared respectively. The results show that the mixing flow pattern of the four-blade turbine stirrer is mainly radial flow,and generates double-cycle vortex,which has strong circumferential driving ability and poor mixing effect. The inclined-blade turbine stirrer of 30°、45° and 66° are mainly axial flow,and the maximum velocity occurs at the stirrer blade tip.
引文
[1]武光霞.涡轮式组合搅拌器流场模拟研究[D].青岛:青岛科技大学,2014.
[2]周国忠,王英琛,施力田.用CFD研究搅拌槽内的混合过程[J].化工学报,2003,54(7):886-890.
[3]张浩伟.SBS改性沥青生产设备的研究[D].西安:长安大学,2017.
[4]张伟山.机械搅拌槽混合过程的数值研究[D].哈尔滨:哈尔滨工业大学,2009.
[5]周国忠.搅拌槽内流动与混合过程的实验研究及数值模拟[D].北京:北京化工大学,2002.
[6]梁瑛娜.直-斜叶组合桨搅拌槽内三维流场的数值模拟与实验研究[D].秦皇岛:燕山大学,2008.
[7]白晓莉,唐克伦,李辉,等.基于Fluent的搅拌器三维流场数值模拟及其实验研究[J].机械工程师,2015(4):17-21.
[8]郭武辉,潘家祯,许洪朋,等.同轴搅拌混合器性能的数值模拟[J].华东理工大学学报:自然科学版,2009,35(3):486-491.
[9]原健安,纪东,祝志刚.SBS剂量对改性沥青性质的影响[J].长安大学学报:自然科学版,2005,25(3):19-22.
[10]马银平.SBS改性沥青的生产工艺研究[J].山西建筑,2011,37(19):109-110.
[11]BUJALSKI W,JAWORSKI Z,NIENOW A.CFD Study of Homogenization with Dual Rushton Turbines-Comparison with Experimental Results[J].Chemical Engineering Research and Design,2002,80(1):97-104.
[12]郭云枫,刘洋,陈兵,等.SBS现场改性沥青路用性能研究[J].城市道桥与防洪,2016(6):62-65+9.
[13]党林贵,郭淑雪,王定标,等.不同组合桨搅拌器搅拌特性的数值研究[J].郑州大学学报(工学版),2013,34(3):59-62+80.
[14]王喆,王凤霞,韩涛.我国改性沥青的研究现状发展及发展前景[J].黑龙江科技信息,2007(14):204.
[2]周国忠,王英琛,施力田.用CFD研究搅拌槽内的混合过程[J].化工学报,2003,54(7):886-890.
[3]张浩伟.SBS改性沥青生产设备的研究[D].西安:长安大学,2017.
[4]张伟山.机械搅拌槽混合过程的数值研究[D].哈尔滨:哈尔滨工业大学,2009.
[5]周国忠.搅拌槽内流动与混合过程的实验研究及数值模拟[D].北京:北京化工大学,2002.
[6]梁瑛娜.直-斜叶组合桨搅拌槽内三维流场的数值模拟与实验研究[D].秦皇岛:燕山大学,2008.
[7]白晓莉,唐克伦,李辉,等.基于Fluent的搅拌器三维流场数值模拟及其实验研究[J].机械工程师,2015(4):17-21.
[8]郭武辉,潘家祯,许洪朋,等.同轴搅拌混合器性能的数值模拟[J].华东理工大学学报:自然科学版,2009,35(3):486-491.
[9]原健安,纪东,祝志刚.SBS剂量对改性沥青性质的影响[J].长安大学学报:自然科学版,2005,25(3):19-22.
[10]马银平.SBS改性沥青的生产工艺研究[J].山西建筑,2011,37(19):109-110.
[11]BUJALSKI W,JAWORSKI Z,NIENOW A.CFD Study of Homogenization with Dual Rushton Turbines-Comparison with Experimental Results[J].Chemical Engineering Research and Design,2002,80(1):97-104.
[12]郭云枫,刘洋,陈兵,等.SBS现场改性沥青路用性能研究[J].城市道桥与防洪,2016(6):62-65+9.
[13]党林贵,郭淑雪,王定标,等.不同组合桨搅拌器搅拌特性的数值研究[J].郑州大学学报(工学版),2013,34(3):59-62+80.
[14]王喆,王凤霞,韩涛.我国改性沥青的研究现状发展及发展前景[J].黑龙江科技信息,2007(14):204.