摘要
在地下隧道工程中,通常采用隔膜泵送方式清淤,应用受限于淤泥状态,颗粒含量,而且隔膜易破损,容易出现故障。为此,设计一种新型清淤装置,压缩空气从侧面流入,经过拉法尔喷嘴在管道中喷出,从而在吸管尾部产生真空,对淤泥、渣石等产生抽吸作用。通过数值模拟的方法研究了进口压力和喉部面积比对真空度的影响,结果表明随着喉部面积比增大,装置耗气量随之线性增大,而真空度先增大后降低。在最佳喉部面积比下,增大进口压力,装置耗气量和真空度都增大。现场实验表明装置对清水和石渣具有良好的抽吸和排渣效果。
In underground tunnel engineering,diaphragm pumping is usually used for dredging,but its application is limited by the state of silt,particle content,and the diaphragm is prone to damage and failure.Therefore,this article designs a new type of dredging device,in which compressed air flows in from the side and is sprayed out of the pipeline through a Laval nozzle,thereby creating a vacuum at the tail of the suction tube and producing a suction effect on sludge,slag,and other materials.The influence of inlet pressure and throat area ratio on vacuum degree is studied through numerical simulation.The results show that as the throat area ratio increases,the gas consumption of the device linearly increases,while the vacuum degree first increases and then decreases.At the optimal throat area ratio,increasing the inlet pressure leads to an increase in both the device′s air consumption and vacuum degree.On site experiments have shown that the device has good suction and slag removal effects on clean water and stone slag.
作者
张明明
ZHANG Mingming(China Railway Construction Heavy Industry Corporation Limited,Changsha Hunan 410100,China)
出处
《铁道建筑技术》
2024年第11期98-100,122,共4页
Railway Construction Technology
基金
中国铁建重工集团股份有限公司科技研发项目(KY201907-02)。
关键词
清淤
拉法尔喷嘴
面积比
真空度
dredging
Laval nozzle
area ratio
vacuum degree
