坡度对虹吸管路气液两相流动水力特性影响试验研究
|
摘要
通过系列试验观察了安装高度为6 m时不同坡度及不同水头差下中行管路倾斜布置的虹吸管内的气液两相流现象及气液两相流流型,并量测了倾斜管路内典型环形掺气电极处含气率的大小。通过实验发现,在正、逆坡管路中,随着坡度的增大,管内伪空化现象逐渐减弱,管内气泡和气囊的大小和数量逐渐减小;虹吸管内的流型与中行管路的布置方式(正坡、逆坡)及坡度的大小无关,坡度的改变仅对逆坡管路能否稳定虹吸产生影响;坡度的逐渐增大使得管内最大含气率及平均含气率均逐渐减小。
A series of tests were conducted to observe the behavior and pattern of the gas-liquid two-phase flow in a tilted siphon installed in middle pipelines;the pipeline was installed at 6m high and its slope and water head were changed in the experiment.The porosities in the flow at the annular electrode in the pipeline were measured.The experimental results show that as the slope angle of the pipeline(a positive slope or a negative slope) increases,pseudo-cavitation in the pipeline gradually weakens and the sizes and quantities of voids and bubbles decrease.The pattern of the two-phase flow in the siphon was not associated with the direction(positive or negative) and slope angle of the middle pipeline;changes in slope angle only affects the stability of siphoning.It is found that both the maximum and average values of porosity in the pipeline decline as the slope angle decreases.
A series of tests were conducted to observe the behavior and pattern of the gas-liquid two-phase flow in a tilted siphon installed in middle pipelines;the pipeline was installed at 6m high and its slope and water head were changed in the experiment.The porosities in the flow at the annular electrode in the pipeline were measured.The experimental results show that as the slope angle of the pipeline(a positive slope or a negative slope) increases,pseudo-cavitation in the pipeline gradually weakens and the sizes and quantities of voids and bubbles decrease.The pattern of the two-phase flow in the siphon was not associated with the direction(positive or negative) and slope angle of the middle pipeline;changes in slope angle only affects the stability of siphoning.It is found that both the maximum and average values of porosity in the pipeline decline as the slope angle decreases.
引文
[1]姜俊红,戴红霞.驼峰后带长直管虹吸式出水流道的水力特性试验研究[J],中国农村水利水电,2008,(8).
[2]陈中涛.虹吸式屋面雨水排水系统水力研究[D].杭州:浙江大学,2007.
[3]王卫平.虹吸管在水库放水涵管改造中的应用[J],节水灌溉,2008,(1).
[4]李琳,邱秀云,许史,等.长距离虹吸管道输水水力学模型试验研究[J].南水北调与水利科技,2010,8(3):106-109.
[5]许史,李琳,邱秀云,等.长距离虹吸管输水试验研究初探[J].中国农村水利水电,2010,(3):70-72.
[6]张小莹,李琳,王梦婷,等.虹吸管气液两相流动压降特性试验[J].水利水电技术,2015,46(11):115-120.
[7]张小莹,李琳,王梦婷,等.虹吸管气液两相流过流能力影响因素分析[J].水电能源科学,2015,33(9):90-94.
[8]张小莹,李琳,王梦婷,等.真空管道水力特性试验研究[J].水力发电,2015,41(11):123-126.
[9]张小莹,李琳,张圣凯.基于实验模型的虹吸管道水气两相流动特性研究[J].新疆农业大学学报,2015,38(3):246-250.
[10]谭义海,李琳,邱秀云.真空有压管道内伪空化水流试验研究[J].中国农村水利水电,2015,(10):100-103.
[2]陈中涛.虹吸式屋面雨水排水系统水力研究[D].杭州:浙江大学,2007.
[3]王卫平.虹吸管在水库放水涵管改造中的应用[J],节水灌溉,2008,(1).
[4]李琳,邱秀云,许史,等.长距离虹吸管道输水水力学模型试验研究[J].南水北调与水利科技,2010,8(3):106-109.
[5]许史,李琳,邱秀云,等.长距离虹吸管输水试验研究初探[J].中国农村水利水电,2010,(3):70-72.
[6]张小莹,李琳,王梦婷,等.虹吸管气液两相流动压降特性试验[J].水利水电技术,2015,46(11):115-120.
[7]张小莹,李琳,王梦婷,等.虹吸管气液两相流过流能力影响因素分析[J].水电能源科学,2015,33(9):90-94.
[8]张小莹,李琳,王梦婷,等.真空管道水力特性试验研究[J].水力发电,2015,41(11):123-126.
[9]张小莹,李琳,张圣凯.基于实验模型的虹吸管道水气两相流动特性研究[J].新疆农业大学学报,2015,38(3):246-250.
[10]谭义海,李琳,邱秀云.真空有压管道内伪空化水流试验研究[J].中国农村水利水电,2015,(10):100-103.