国防科技大学学报
國防科技大學學報
국방과기대학학보
JOURNAL OF NATIONAL UNIVERSITY OF DEFENSE TECHNOLOGY
2014年
3期
25-31
,共7页
雾化%多尺度仿真%大涡模拟%流体体积法%拉格朗日粒子法
霧化%多呎度倣真%大渦模擬%流體體積法%拉格朗日粒子法
무화%다척도방진%대와모의%류체체적법%랍격랑일입자법
primary atomization%multiscale%large eddy simulation%volume of fluid%Lagrangian particle tracking
提出了一种雾化过程多尺度仿真算法:对大块液团运动,采用流体体积法直接模拟;将与网格尺度相当或更小的液滴简化成粒子,采用一种基于虚网格的拉格朗日粒子法进行追踪;湍流运动采用了湍流动能单方程输运模型的大涡模拟。基于新算法开发了一套仿真程序,并对此程序进行了验证,对影响模型精度的重要参数进行了深入研究。采用该算法对单股射流的雾化过程进行了仿真,雾场的瞬态和统计特性分析表明,仿真结果与试验结果吻合较好。
提齣瞭一種霧化過程多呎度倣真算法:對大塊液糰運動,採用流體體積法直接模擬;將與網格呎度相噹或更小的液滴簡化成粒子,採用一種基于虛網格的拉格朗日粒子法進行追蹤;湍流運動採用瞭湍流動能單方程輸運模型的大渦模擬。基于新算法開髮瞭一套倣真程序,併對此程序進行瞭驗證,對影響模型精度的重要參數進行瞭深入研究。採用該算法對單股射流的霧化過程進行瞭倣真,霧場的瞬態和統計特性分析錶明,倣真結果與試驗結果吻閤較好。
제출료일충무화과정다척도방진산법:대대괴액단운동,채용류체체적법직접모의;장여망격척도상당혹경소적액적간화성입자,채용일충기우허망격적랍격랑일입자법진행추종;단류운동채용료단류동능단방정수운모형적대와모의。기우신산법개발료일투방진정서,병대차정서진행료험증,대영향모형정도적중요삼수진행료심입연구。채용해산법대단고사류적무화과정진행료방진,무장적순태화통계특성분석표명,방진결과여시험결과문합교호。
A new multiscale method of primary atomization is proposed.The liquid blobs larger than the grid volumes were captured by the volume of fluid algorithm,the droplets comparable with the grid volumes or smaller were simplified to particles and tracked by a Lagrangian particle tracking model on a virtual mesh.Large eddy simulation with one equation sub-grid scale turbulent energy transport model was used to describe the turbulent flow.A new developed code was validated by several cases,and some key parameters were investigated to improve the precision.The primary atomization of a single jet was calculated,and the results of instantaneous and average characteristics are in good agreement with the experimental results.