摘要
为了优化多孔孔板流量计的结构、提高计量精度,结合实验、CFD仿真与射流理论相结合的方法对多孔孔板流量计计量精度的影响因素进行分析.结果表明:漩涡的卷吸作用是影响计量精度的关键因素,并得出回流通量能够表征卷吸作用的结论;多孔孔板流量计在不同的流速范围内,回流通量沿流向呈非相似性分布和相似性分布.在非相似性分布的流速区间内,流出系数C_d的重复性较差,不同多孔孔板的重复性随着回流通量的增加而增大,流出系数C_d波动较大.在相似性分布的流速区间内,流出系数C_d的重复性较好,不同多孔孔板流量计的量程范围和线性度随着回流通量的增大而降低.
In order to optimize the structure of the multi-hole orifice flow meter and improve the measurement precision,with the combination of experiment,CFD and the theory of jet the influence factors of multi-hole orifice flow meter measurement accuracy are studied in this paper.It is concluded that the entrainment of vortexes is the main factor affecting the accuracy of measurement,and backflow flux can characterize the strength of entrainment. In different flow rate ranges,backflow flux presents dissimilar and similar distributions along the flow. In the velocity range of dissimilar distribution,the repeatability of discharge coefficient C_d is poor and the value of repeatability increases with the increase of backflow flux;the discharge coefficient C_d fluctuates strongly. In the velocity range of similar distribution,the discharge coefficient C_d has good repeatability,and the linearity and range of multi-hole orifice meter decrease with the increase of backflow.
出处
《天津大学学报（自然科学与工程技术版）》
EI
CSCD
北大核心
2016年第5期465-471,共7页
Journal of Tianjin University：Science and Technology
关键词
多孔孔板流量计
回流通量
射流
卷吸
multi-hole orificeflow meter
backflow flux
jet
entrainment
