基于CFD-DPM耦合法新型差压密度计中水泥浆液流动特性分析

发布时间：2018-02-15 01:41

本文关键词： CFD-DPM 水泥浆液流动特性水灰比固液两相流　出处：《中南大学学报(自然科学版)》2017年05期 　论文类型：期刊论文

【摘要】：为了揭示水泥浆液密度检测过程中运动规律,基于欧拉-拉格朗日法建立连续-离散相模型,通过CFD连续模型和DPM离散模型分别求解液相速度分布和固相颗粒运动轨迹,对差压密度计中水泥浆液流速场和颗粒场进行模拟。研究结果表明:在差压密度计测量过程中,水灰比为5:1~3:1的低质量分数浆液沿测量筒中心线和横截面方向均匀分布,水灰比为3:1~0.5:1的高质量分数浆液沿测量筒中心线方向均匀分布,沿横截面方向呈一阶递减梯度分布,常规质量分数水泥浆液在核心测量区域内基本呈稳定流动状态;水灰比为0.5:1~5:1的浆液固相颗粒均匀分布于测量筒内,未出现局部聚集和真空区域。双耦合模型解决了水泥浆液传统模型模拟失真问题,为差压密度计研发过程中水泥浆液流动状态的分析提供了依据。
[Abstract]:In order to reveal the movement rule of cement grout density detection process, the Euler Lagrange method to establish continuous discrete phase model based on distribution and solid particle trajectory by CFD continuous model and discrete model DPM respectively solve the liquid velocity, the velocity field and particle field of cement slurry flow differential density meter was simulated. The results show that: in the differential density meter measurement process, low water cement ratio for 5:1~3:1 slurry mass fraction measured along the cylinder center line and cross section of uniform distribution, water cement ratio high concentration slurry as 3:1~0.5:1 along the center line of the measuring tube to uniform distribution along the cross section direction is a first-order decreasing gradient distribution, conventional mass fraction a cement slurry in the core area of steady flow measurement; water cement ratio of 0.5:1~5:1 slurry solid particles distributed uniformly in the measuring tube, there was no local aggregation and vacuum region. The dual coupling model solves the distortion of the traditional model of cement slurry, and provides the basis for the analysis of the flow state of the cement slurry during the development process of the differential pressure densitometer.

【作者单位】：中南大学地球科学与信息物理学院有色金属成矿预测与地质环境监测教育部重点实验室湖南省有色金属资源与地质灾害探查重点实验室;
【基金】：国家自然科学基金资助项目(51208514) 国家中小企业创新基金资助项目(12C26214304879) 中南大学中央高校基本科研业务费专项资金资助项目(2011QNZT007)~~
【分类号】：O359

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