纸机干燥部蒸汽喷射式热泵内流体流动的三维CFD模拟  

Three-Dimensional CFD Modeling of Fluid Field inside Steam Ejector Heat Pump Used in Dryer Section of the Paper Machine

作　　者：袁越锦[1] 袁月定[2] 党新安[1] 吴中华[3] 刘亚萍[1] 

机构地区：[1]陕西科技大学机电工程学院,西安710021 [2]宜春学院数学与计算机科学学院,宜春336000 [3]天津科技大学机械工程学院,天津300222

出　　处：《纸和造纸》2012年第5期6-9,共4页Paper and Paper Making

基　　金：陕西省自然科学基金资助项目(2011JM3013);陕西科技大学自然科学基金资助项目(ZX11-23);浙江省温州市科技计划项目(H20100096)

摘　　要：运用计算流体动力学(CFD)方法建立纸机干燥部蒸汽喷射式热泵内流体流动的三维数值模型并进行数值模拟。模拟结果表明:热泵内流体速度场并不完全呈旋转轴对称分布;热力与结构参数对热泵的工作性能影响很大,喷射系数随着引射流体压力的增大而迅速增大,在一定范围内增大工作蒸汽压力可迅速提高喷射系数,但当压力超过某一定值后,喷射系数反而随着压力的升高而逐渐降低;存在一个最优的喉嘴距可使喷射系数达到最大值。A three-dimensional model of the fluid field inside the steam ejector heat pump used in the dryer section of the paper machine was developed by applying the computational fluid dynamics （CFD） technique. The simulation results indicated that the fluid velocity field in heat pump has a incomplete axially symmetrical distribution. The entrainment ratio of the heat pump initially increases rapidly with the increase of the ejected steam inlet pressure and then decreases after the inlet pressure exceeds one certain value. There is an optimized steam nozzle position under the given operating condition where the maximum of entrainment ratio was observed.

关 键 词：纸机 干燥部 蒸汽喷射式热泵 三维模型 CFD模拟 

分 类 号：TS734[轻工技术与工程—制浆造纸工程]