润滑与密封
潤滑與密封
윤활여밀봉
LUBRICATION ENGINEERING
2014年
12期
96-100
,共5页
静态混合器%固体颗粒冲蚀%流场分析
靜態混閤器%固體顆粒遲蝕%流場分析
정태혼합기%고체과립충식%류장분석
static mixer%solid particle erosion%flow field analysis
为研究SK型静态混合器内固体颗粒对混合元件的冲蚀程度，采用固－液两相流及计算流体力学方法（CFD），建立冲蚀及流场模型，运用Ansys Workbench中的流体动力学模块，对SK型静态混合器内的颗粒运动轨迹和颗粒对静止元件的冲蚀情况进行分析。结果表明：颗粒对静止元件的冲蚀主要发生在元件的螺旋边缘处，在总元件的3／5个处达到最大，且靠近入口和中间段的元件冲蚀量也较大；除冲击角度外，颗粒平均直径和平均冲蚀速度对冲蚀的作用最为关键，当颗粒粒径、速度和体积分数达到某一组合时产生的冲蚀现象最严重；冲蚀现象是固体颗粒的物理属性和流场特性的综合作用结果。
為研究SK型靜態混閤器內固體顆粒對混閤元件的遲蝕程度，採用固－液兩相流及計算流體力學方法（CFD），建立遲蝕及流場模型，運用Ansys Workbench中的流體動力學模塊，對SK型靜態混閤器內的顆粒運動軌跡和顆粒對靜止元件的遲蝕情況進行分析。結果錶明：顆粒對靜止元件的遲蝕主要髮生在元件的螺鏇邊緣處，在總元件的3／5箇處達到最大，且靠近入口和中間段的元件遲蝕量也較大；除遲擊角度外，顆粒平均直徑和平均遲蝕速度對遲蝕的作用最為關鍵，噹顆粒粒徑、速度和體積分數達到某一組閤時產生的遲蝕現象最嚴重；遲蝕現象是固體顆粒的物理屬性和流場特性的綜閤作用結果。
위연구SK형정태혼합기내고체과립대혼합원건적충식정도，채용고－액량상류급계산류체역학방법（CFD），건립충식급류장모형，운용Ansys Workbench중적류체동역학모괴，대SK형정태혼합기내적과립운동궤적화과립대정지원건적충식정황진행분석。결과표명：과립대정지원건적충식주요발생재원건적라선변연처，재총원건적3／5개처체도최대，차고근입구화중간단적원건충식량야교대；제충격각도외，과립평균직경화평균충식속도대충식적작용최위관건，당과립립경、속도화체적분수체도모일조합시산생적충식현상최엄중；충식현상시고체과립적물리속성화류장특성적종합작용결과。
In order to study the erosion extent of mixing element caused by solid particle in SK-static mixer,the erosion and flow field model was established by using solid-liquid two-phase flow and computational fluid dynamic method.Particle track and erosion on the static element caused by particle in the SK-static mixer were analyzed through fluid dynamic mod-ule in Ansys Workbench.The results show that erosion caused by particle mainly occurs at the helix edges of the elements, and the erosion rate density reaches the maximum at the three fifth of total element.Erosion rate density is also serious near the inlet and middle part of total elements.Averaged particle diameter and particle speed are the key factors influencing the erosion process apart from impact angle.The erosion is more serious with certain combination of particle diameter,impact velocity and volume fraction.The phenomenon of particle erosion is the result of comprehensive effecting of particle physi-cal property and flow field features.
