文档介绍：上海交通大学
硕士学位论文
疏浚泥分离用水力旋流器效率的数值模拟研究
姓名:孙磊
申请学位级别:硕士
专业:船舶与海洋结构物设计制造
指导教师:谭家华
20091101
上海交通大学硕士学位论文
疏浚泥分离用水力旋流器效率的数值模拟研究
摘要
随着疏浚量的增大和环保要求的提高,合理利用疏浚泥资源具有重要的意义。
在疏浚工程中,疏浚泥的产量大且含泥量高,不利于进一步处理和再利用。为解决
疏浚泥处含沙量过大,应用 Fluent 软件建立水力旋流器内两相湍流三维模型,基于
疏浚泥的物理性质,数值模拟了水力旋流器脱水过程,选择两种分离效率公式,并
推导了适用于疏浚泥分离用旋流器的能量损失公式,作为分离性能和操作性的指
标。计算分析了旋流器圆柱段长度对分离效率的影响,提出一种圆柱型旋流器,其
分离效率和耗能都优于常规长锥型旋流器,计算了在疏浚泥浓度范围内,此类型旋
流器能够达到较高的分离效率。验证了对于固定结构的旋流器,生产能力存在上限
和下限,即改变入口速度对旋流器能耗的影响是有限的。计算了旋流器溢流管插入
深度对分离性能和操作性能的影响,说明了合适的溢流管插入深度有利于提高分离
效率。设计计算了带挡板的旋流器和带顶帽底帽的旋流器,这两种特殊结构使得旋
流器的分离性能进一步提高,回收率接近 100%,解决了底角泥沙堆积问题。
关键词:疏浚泥,水力旋流器,分离效率,数值模拟
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上海交通大学硕士学位论文
STUDY ON EFFICIENCY OF THE DREDGED SEDIMENTS
SEPARATION HYDROCYCLONE
ABSTRACT
With dredging quantity increasing and environment protection standard raising,
rational use was important. In dredging engineering it produced a lot of dredged sediment
with thick silt. It was bad to deal with or recycle. For solving the problem study a
hydrocyclone for dredged sediments separation by using Fluent to build 3D model with
two phase turbulence flow, it simulated the dewatering process in the hydrocyclone in
view of plicated physical properties. Choose two separation efficency formulars
and reason the energy loss formula for separation of dredged sediments as a standard of
separation and operation capability. It analyzed the influences about the cylindrical length
and the separation efficiency of the hydrocyclone. It presented an entire cylindrical
hydrocyclone. It was better than the general hydrocyclone in separation capability and
energy loss. Compute the hydrocyclone capability in dredged sediments concentration.
Check the production limit, that has an upper limt and lower limit, for an invariable
hydrocyclone in structure. That meaned it only influnced energy loss of the hydrocyclone
in a certain extent by changing inlet velocity. Give the relationship between the inserting
length of the overflow pipe and separation and o