化工进展
化工進展
화공진전
CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
2014年
6期
1413-1418
,共6页
混合室%设计%计算流体力学%数值模拟%浆料分布
混閤室%設計%計算流體力學%數值模擬%漿料分佈
혼합실%설계%계산류체역학%수치모의%장료분포
mixing chamber%design%computational fluid dynamics%numerical simulation%distribution of pulp
为了进一步改善新型布浆器的布浆性能，设计了单腔式混合室（混合室Ⅰ）、以两组支管为单位的多腔式混合室（混合室Ⅱ）及以单组支管为单位的多腔式混合室（混合室Ⅲ），采用计算流体力学（CFD）方法对混合室内的流动特性进行了模拟。结果表明，单腔混合室内，由于平行射流组各股射流间的强烈干涉作用，导致各股射流向混合室中部聚集，造成出口处质量流量分布呈现中间明显高于两侧的状态。在多腔混合室Ⅱ内，每个混合腔内有两组射流，保证了浆料的良好混合，避免了射流在中部聚集的现象。在多腔混合室Ⅲ内，由于每个混合腔内只有一组支管射流，实现了互补混合过程，混合效果明显好于混合室Ⅰ和混合室Ⅱ。从质量流量分布看，混合室Ⅲ的分布曲线比混合室Ⅰ和混合室Ⅱ的更平缓，其最大偏差仅为0.254%，明显小于混合室Ⅰ的0.538%和混合室Ⅱ的0.294%，更接近于理论混合平均值和期望值。
為瞭進一步改善新型佈漿器的佈漿性能，設計瞭單腔式混閤室（混閤室Ⅰ）、以兩組支管為單位的多腔式混閤室（混閤室Ⅱ）及以單組支管為單位的多腔式混閤室（混閤室Ⅲ），採用計算流體力學（CFD）方法對混閤室內的流動特性進行瞭模擬。結果錶明，單腔混閤室內，由于平行射流組各股射流間的彊烈榦涉作用，導緻各股射流嚮混閤室中部聚集，造成齣口處質量流量分佈呈現中間明顯高于兩側的狀態。在多腔混閤室Ⅱ內，每箇混閤腔內有兩組射流，保證瞭漿料的良好混閤，避免瞭射流在中部聚集的現象。在多腔混閤室Ⅲ內，由于每箇混閤腔內隻有一組支管射流，實現瞭互補混閤過程，混閤效果明顯好于混閤室Ⅰ和混閤室Ⅱ。從質量流量分佈看，混閤室Ⅲ的分佈麯線比混閤室Ⅰ和混閤室Ⅱ的更平緩，其最大偏差僅為0.254%，明顯小于混閤室Ⅰ的0.538%和混閤室Ⅱ的0.294%，更接近于理論混閤平均值和期望值。
위료진일보개선신형포장기적포장성능，설계료단강식혼합실（혼합실Ⅰ）、이량조지관위단위적다강식혼합실（혼합실Ⅱ）급이단조지관위단위적다강식혼합실（혼합실Ⅲ），채용계산류체역학（CFD）방법대혼합실내적류동특성진행료모의。결과표명，단강혼합실내，유우평행사류조각고사류간적강렬간섭작용，도치각고사류향혼합실중부취집，조성출구처질량류량분포정현중간명현고우량측적상태。재다강혼합실Ⅱ내，매개혼합강내유량조사류，보증료장료적량호혼합，피면료사류재중부취집적현상。재다강혼합실Ⅲ내，유우매개혼합강내지유일조지관사류，실현료호보혼합과정，혼합효과명현호우혼합실Ⅰ화혼합실Ⅱ。종질량류량분포간，혼합실Ⅲ적분포곡선비혼합실Ⅰ화혼합실Ⅱ적경평완，기최대편차부위0.254%，명현소우혼합실Ⅰ적0.538%화혼합실Ⅱ적0.294%，경접근우이론혼합평균치화기망치。
In order to improve performance of pulp distribution of new distributor,three structures of mixing chamber were designed,namely single cavity mixing chamber (mixing chamberⅠ), multicavity mixing chamber with two sets of branch pipes as a unit (mixing chamberⅡ),multicavity mixing chamber with a set of branch pipe as a unit (mixing chamberⅢ),and computational fluid dynamics(CFD) was used to simulate flow characteristic in three mixing chambers. The results showed that in the mixing chamberⅠ,there was strong interference effect between two adjoining jet-flows in a row parallel pipes and jet-flows assembled to central section in mixing chamber. So the mass flow rate out of mixing chamber in center was obviously higher than two sides. In the mixing chamberⅡ,two sets of jet-flow in a mixing chamber could have a good mixture and avoided phenomenon of jet-flows aggregation. In the mixing chamber Ⅲ,there were only two jet-flows of corresponding branch pipe in every mixing chamber and complementary mixture was really realized. From the viewpoint of distribution of mass flow rate out of mixing chamber,the curve of mass flow rate of mixing chamberⅢ was much gentler than mixing chamberⅠ and mixing chamberⅡ. Maximum deviation of mass flow rate to expected value in mixing chamberⅢ was only 0.254%,obviously smaller than 0.538%in mixing chamberⅠand 0.294%in mixing chamberⅡ.
