摘要
为了研究管路系统对冷却塔水轮机的影响及冷却塔水轮机全过流系统的水力特性,提出了以下3种方案:方案1中不包含管路,仅对冷却塔水轮机进行水力特性分析;方案2和方案3中含有不同的水流管路系统。为此,建立了包含冷却塔水轮机机组、冷却塔水流管路等在内的全过流系统,并利用计算流体动力学软件,对重力场下的水轮机全过流系统的水力特性进行了三维数值模拟。结果表明:①管路的存在对水轮机的水力特性具有影响,与方案1相比,方案2和方案3中冷却塔的水轮机蜗壳、导叶、尾水管的水力损失均较大,转轮的水力损失较小;②方案1中冷却塔水轮机总的水力损失较小,为方案2和方案3总水力损失的91%,92%;③在方案2和方案3中,水轮机各个过流部件的水力损失相差均在0.002 m以内;④对于管路系统而言,与方案2相比,方案3能改善总管内的出流撞击现象,减少水力损失。
In order to analyze the impact of pipe system on the turbine used in cooling tower and hydraulic characteristics of flow system in the entire cooling tower,three schemes were proposed in this paper.The pipe system was excluded from the scheme 1,so we only analyzed the hydraulic characteristics of the turbine used in cooling tower under the scheme 1.Different pipe systems were involved in the scheme 2 and 3.Also,we constructed the entire flow system including turbine units and pipe system of cooling tower.Besides,the Computational Fluid Dynamics Software was adopted to simulate the hydraulic characteristics of the entire flow system in the gravitational field.The results showed that:①The pipe system had an effect on the hydraulic characteristics of the turbine.Compared with the scheme 1,the hydraulic losses in spiral case,guide vane and draft tube were relatively great and the hydraulic losses in turbine runner were relatively small under the scheme 2 and 3.②The total hydraulic loss was relatively small under the scheme 1,and it was 90%and 92%of the total hydraulic loss under the scheme 2 and 3 respectively.③The difference between turbine components was within 0.002m under the scheme 2 and 3.④For the pipe system,the scheme 3 could improve the outflow impact in the main pipe,compared with the scheme 2.
作者
王亦晓
秦战生
周大庆
桂佳
WANG Yixiao;QIN Zhansheng;ZHOU Daqing;GUI Jia(College of Energy and Electrical Engineering,Hohai University,Nanjing 211100,China)
出处
《人民长江》
北大核心
2020年第6期212-216,共5页
Yangtze River
关键词
水力特性
过流系统
重力场
水力损失
冷却塔水轮机
hydraulic characteristics
flow through system
gravitational field
hydraulic loss
turbine of cooling tower
