摘要
为了研究苎麻纤维残留胶质的射流冲击分纤脱胶机理,设计试制了高温射流冲洗试验装置,开展了单喷嘴和双喷嘴开纤脱胶试验,数值模拟了单喷嘴和双喷嘴射流冲击壁面的表面温度场、压力场分布及有效的作用区域。结果表明,当喷嘴直径为2.0 mm,进口温度为373 K时,单喷嘴射流冲击试验的较佳组合参数喷距为30 mm,进口压强为1.2 MPa,时间为16 min,测得残胶率为3.1%;以单喷嘴相同设定参数模拟了双喷嘴较佳喷嘴间距为30 mm,冲击压力范围为0.2~0.3 MPa,温度范围为320~334 K,该试验测试的喷嘴间距与数值模拟相符合,测试残胶率为3.1%,单纤维断裂强力为51.71 c N。该技术为开发新型苎麻纤维分纤洗脱设备提供技术参数。
In order to research and develop a new technology of ramie fiber splitting and residual gum removal,ramie fibers treated by alkali scouring with 10.8%residual gum content were selected as the research object.A hydraulic dynamic device was trial-manufactured for investigating the ramie fiber splitting and residual gum removal.According to the trial results,an equipment with a high temperature（373 K）water-jet function was designed and manufactured.Firstly,without consideration of interaction among factors,orthogonal experiments with 3 factors and 3 levels were carried out using the equipment with single nozzle to inspect the influence of jet distance,inlet pressure,and treating time on the residual gum content.The results showed that the optimal combination was 30 mm jet distance,1.2 MPa inlet pressure,and 16 min treating time,and the jet distance was the primary factor.Under the optimal conditions,residual gum rate was 3.1%.Secondly,under the conditions of the inlet pressure of 1.2 MPa,the outlet diameter of 2.0 mm,and the temperature of 373 K,the distribution of both temperature field and pressure field,and the effective area on ramie fiber surface by the treatment of water-jet impact with single nozzle were simulated using the FLUENT software,with different jet distance of 20,30,40 and 50 mm.The numerical simulation results indicated that with 30 mm jet distance,the pressure field on ramie fiber surface was in a range from 0.16 to 0.30 MPa,which was consistent with the outcomes of hydraulic dynamic impact experiment as well as the orthogonal experiments.Thus,it hinted that the jet distance at 30 mm was the most effective condition for the ramie fiber splitting and residual gum removal.Meanwhile,the inlet pressure at 1.2 MPa,the outlet diameter of 2.0 mm,the temperature at 373 K,the jet distance at 30 mm,and the internal space between nozzles ranging from 20,30 to 40 mm were set to simulate the effective area on ramie fiber surface by the treatment of water-jet impact with double nozzles.The numerical simulat
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2017年第10期302-309,F0003,共9页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金项目(51375351)
关键词
纤维
温度
压力
射流冲击
苎麻
数值模拟
开纤
脱胶
fiber
temperature
pressure
jet impingement
ramie
numerical simulation
splitting
degumming
