广东轻工职业技术学院学报
廣東輕工職業技術學院學報
엄동경공직업기술학원학보
JOURNAL OF GUANGDONG INDUSTRY TECHNICAL COLLEGE
2014年
1期
1-5
,共5页
流浆箱%稀释水%混合%数值模拟
流漿箱%稀釋水%混閤%數值模擬
류장상%희석수%혼합%수치모의
headbox%dilution water%mixing%numerical simulation
稀释水调浓水力式流浆箱通过局部调节浆料浓度控制全幅横向定量偏差,采用Realizable κ-ε湍流模,利用数值模拟的方法研究稀释水在布浆支管内与浆流的混合与扩散特性,数值模拟结果与相关试验数据吻合良好;稀释水在浆流中的混合主要通过反向漩涡的逐渐扩散。在入射点近场,稀释水与浆流快速混合,当z/d>7后,混合参数M变化趋向平缓,这表明混合速度逐渐降低。在稀释水入射点的下游,距离入射点越远,射流扩散程度越高,混合效果越好;提高稀释水的入射速度,有利于提高混合效果。
稀釋水調濃水力式流漿箱通過跼部調節漿料濃度控製全幅橫嚮定量偏差,採用Realizable κ-ε湍流模,利用數值模擬的方法研究稀釋水在佈漿支管內與漿流的混閤與擴散特性,數值模擬結果與相關試驗數據吻閤良好;稀釋水在漿流中的混閤主要通過反嚮漩渦的逐漸擴散。在入射點近場,稀釋水與漿流快速混閤,噹z/d>7後,混閤參數M變化趨嚮平緩,這錶明混閤速度逐漸降低。在稀釋水入射點的下遊,距離入射點越遠,射流擴散程度越高,混閤效果越好;提高稀釋水的入射速度,有利于提高混閤效果。
희석수조농수력식류장상통과국부조절장료농도공제전폭횡향정량편차,채용Realizable κ-ε단류모,이용수치모의적방법연구희석수재포장지관내여장류적혼합여확산특성,수치모의결과여상관시험수거문합량호;희석수재장류중적혼합주요통과반향선와적축점확산。재입사점근장,희석수여장류쾌속혼합,당z/d>7후,혼합삼수M변화추향평완,저표명혼합속도축점강저。재희석수입사점적하유,거리입사점월원,사류확산정도월고,혼합효과월호;제고희석수적입사속도,유리우제고혼합효과。
The method of adjusting the local concentration is taken by hydraulic headbox to control the basis weight in cross direction .In this paper , the turbulence model of Realizable κ-ε was adopted to simulate the mixing of dilution water with stock .The results of simulation are consistent with that of experiment .Reverse vortex pair is the main form of dilution water diffuses in stock .The result shows dilution water and stock mix quickly in near field of jet point, but in the downstream, the mixing parameters ( M) keeps comparatively steady when z >7d.This illustrates the speed of mixing decreases gradually .In the downstream , the dilution get more even with distance increases.Increasing the incidence speed of dilution water is good for mixing effect .