摘要
为解决射流混水过程中的综合性能问题,探索射流混水物理场,利用计算流体力学、传热学理论,改变主动流体的Re,对射流混水过程进行数值计算。深入研究的结果表明：随着Re的减小,射流混水过程整体速度降低,壁面处速度梯度减小;入口2、出口两侧（或单侧）区域温度值较大,温度最大值发生在入口2第一条等值线;靠近壁面处熵产值较大,最大值发生在混合室上壁,湍流核心区熵产值较小,最小值发生在中轴线区域,它们间的熵产不具有同一量级,即产生一种＂壁面现象＂;随Re增大,熵产的面积加权平均值渐变波动增大,射流混水过程中粘性熵产比传热熵产大得多。射流混水过程最Re区间为1 950 000~215 500。
In order to solve the comprehensive performance problem of jet mixing and explore the physical field of jet mixing,this paper used computational fluid dynamics and heat transfer theory to change Re of active flow and made numerical calculation for the process of jet mixing.The results of deeply study showed that velocity of jet mixing and velocity gradient of wall surface reduced with reduction of Re.The temperature of two sizes（or one side） of outlet and inlet2 was higher and the maximum temperature appeared in the first isoline of inlet2.The entropy generation closed to the wall was large,of which maximum appeared in the superior wall of mixing chamber and the entropy generation in the core area of turbulence was small,of which minimum appeared in the medial axis area.The entropy generation between them had different orders,which caused wall surface phenomenon.The variable fluctuation of area-weighted mean of entropy generation increased with increasing Re and the viscous entropy generation was much larger than the heat-transfer entropy generation in the jet mixing.The best interval of Re is between 1950000 and 215500 in the process of jet mixing.
出处
《水资源与水工程学报》
2010年第5期72-75,共4页
Journal of Water Resources and Water Engineering
基金
辽宁工程技术大学研究生科研立项资助(Y201001203)
关键词
射流混水
计算流体力学
壁面现象
数据结论
jet mixing
computational fluid dynamics
wall surface phenomenon
conclusion of data
