水流量标准装置的高精度换向器设计  

Design of highly-accuracy diverter for primary water flow standard facility

作　　者：朱雷[1] 张建光[1] 张海平[1] 陈莹[1] 孟晓超[1] 

机构地区：[1]中国水利水电科学研究院水力机械实验室,北京100038

出　　处：《排灌机械工程学报》2014年第6期511-516,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：水利部公益性行业科研专项经费资助项目(201001049)

摘　　要：为了在水力机械模型测试中对流量进行原位标定,并在水利行业建立水大流量的溯源基准,中国水利水电科学研究院研制了静态质量法水大流量标准装置.文中对标准装置中的关键装置换向器进行了设计.首先设计了新型换向器装置,并依据计量检定规程JJG164—2000对换向器进行了检定,结果表明在流量Q为0.8m^3/s条件下换向器相对不确定度U_(Drel)为0.015%(k=2);在此基础上应用数值模拟的方法对换向器过程进行了分析,采用VOF两相流模型和K-ε湍流模型求解换向器内的气液分界面,计算不同位置的注入流量;最后利用高速摄像确定了换向器运动过程,得到了换向器的动态曲线并确定计时触发位置.研究结果已应用于水大流量原位标定以及大口径流量计的检定和校准.A new high-accuracy diverter for primary water flow standard facility has been developed by hydraulic machinery laboratory at IWHR,China.As the core of water calibration facility,diverter determines the test accuracy.Diverter uncertainty test was performed according to China verification code of JJG 164—2000,getting the result that combined standard uncertainty of diverter UDrel is less than 0.015%（k =2）.In order to analyze the dynamic principal characteristic,numerical simulation method was adopted,which employs VOF multiphase model and k- e turbulence model to obtain the water volume fraction inside diverter and to calculate the collecting rate for different positions.By high-speed camera,the operation procedure of the diverter has been obtained,and the dynamic curve and the timing trigger position have been achieved.The results have been applied to calibrate large flow in situ and large diameter flowmeter.

关 键 词：换向器 静态质量法 水流量标准装置 不确定度 VOF两相流模型 

分 类 号：S277.9[农业科学—农业水土工程] TK7[农业科学—农业工程]