摘要
针对异纤分拣机剔除系统喷管板不合理设计导致的喷管板气流出口速度分布不均匀和能量损耗大的问题,对剔除系统喷管板的上板进行了喷管流道形状优化设计,采用维托辛斯基(Vitosinski)曲线方法和富尔士(Furs)方法设计一个传统的拉瓦尔喷管,用等长度等截面积方法对其进行矩形截面的转换,运用数值方法验证了转换的最佳起始点为喉部到扩张段20%的位置,出口截面宽高比在1.0~0.7时转换效果最佳,在这2个约束条件下对喷管板上板进行变形。对优化前后的喷管板进行整体的数值模拟,结果表明:气流出口速度由最大相差10%左右减小到相差0.3%左右,入口压力由0.4MPa减小到了0.2MPa,使喷管出口速度变得均匀,并减小能量损耗。
Aiming at the problem of uneven distribution of airflow outlet velocity and large energy loss caused by unreasonable design of the nozzle plate of the foreign fiber sorter rejection system,this paper optimizes the flow path shape of the upper plate of the nozzle plate.A traditional Laval nozzle was designed using the Vitosinski curve method and the Furs method,and then the shape of the exit rectangular section was converted by the equal length and other cross-sectional area method.The numerical method was used to verify that the optimal starting point of the conversion was 20% from the throat to the expansion section,and the best conversion effect was obtained when the aspect ratio of the outlet section is 1.0~0.7.The upper plate of the nozzle plate were then optimized under these two constraints.The numerical simulation of the nozzle plate before and after optimization was carried out.The results show that the outlet velocity of the airflow is reduced from about 10% to a difference of about 0.3%,and the inlet pressure is reduced from 0.4 MPa to 0.2 MPa,which makes the nozzle outlet speed uniform and reduces energy loss.
作者
杜玉红
陈一平
周志超
董超群
DU Yu-hong;CHEN Yi-ping;ZHOU Zhi-chao;DONG Chao-qun(Tianjin Key Laboratory of Modern Mechanical and Electrical Equipment Technology,Tianjin Polytechnic University,Tianjin 300387,China)
出处
《天津工业大学学报》
CAS
北大核心
2019年第4期76-82,共7页
Journal of Tiangong University
基金
国家自然科学青年基金资助项目（51205288）
天津市科委面上基金资助项目（13jcybjc15900）
天津市科技支撑计划重点项目（16YFZCSY00860）
关键词
异纤
拉瓦尔喷管
流道形状
矩形截面
数值模拟
foreign fiber
Laval nozzle
flow path shape
rectangular section
numerical simulation
