摘要
为了进一步提高气力清淤的浓度和效率,提出一种新的轴向螺旋进气方式。以普通河砂模拟淤积固体,采用与工程实际相近的槽底供砂方式,在运动中抽砂,研究螺旋进气对气力清淤性能的影响。结果表明:水平清淤,气力清淤性能随进气螺旋角的增加而增加,性能曲线呈驼峰式发展。当螺旋角为10°时系统获得最佳性能,此时系统排砂量和提升效率较常规气力清淤分别提高28%和11.8%。垂直清淤,气力泵吸口埋入砂层,系统排砂量和排砂浓度得到进一步提高,且二者随气力泵埋入深度的增加而增加,砂层出现明显坍塌和流动,呈以气力泵为中心的倒圆锥砂坑,且砂坑体积与泵的埋入深度成正比增长。
A new air injection method was proposed to improve the concentration and efficiency of airlift systems. The effect of air swirl injection angle on airlift dredging performance was studied by using ordinary river sand to simulate the underwater sediment, and the sand supply at the bottom of the water tank which was similar to the engineering practice. The results show that the dredging performance of airlift increases with the increase of angle in air injection, and a peak value corresponds to it. The maximum solid mass flow rate and lifting efficiency of the swirl injection operating at the angle of 10 o have improved by 11.8% and 28% over that of conventional injection. Solids mass flow rate and lifting concentration had improved significantly in the case of airlift pump suction buried in sand(H<0), and both of them increase with the increases of H. During the experiment of the sand pump in a vertical direction, the underwater sand layer collapsed and flowed, inverted conical sand pits volumes increased in direct proportion to the depth of the pump embedded in the sand layer obtained.
作者
胡东
林安源
王霞光
林鹏
HU Dong;LIN An-yuan;WANG Xia-guang;LIN Peng(Collge of Energy and Mechanical Electrical Engineering,Hunan Universiry of Humanities,Science and Technology,Loudi 417000,China)
出处
《泥沙研究》
CAS
CSCD
北大核心
2022年第3期45-51,共7页
Journal of Sediment Research
基金
国家自然科学青年科学基金项目(52006061)
湖南省重点研发计划项目(2020NK2063)
湖南省水利科技项目(XSKJ2019081-56)
湖南省教育厅重点科研项目(18A419)。
关键词
清淤
气力提升
螺旋进气
浓度
效率
dredging
airlift
swirl injection
concentration
lifting efficiency
