摘要
流量测验常见方法有常规水文缆道流速仪法、超声波时差法、声学多普勒流速(ADCP)、雷达波流速等,上述方法各有优缺点,适用于不同场合。文丘里现象被广泛用来测量封闭管道中单相稳定流体的流量,依据伯努利定律可知流速的增大伴随流体压力的降低,即受限流动在通过缩小的过流断面时流体出现流速增大的文丘里效应,根据该效应,可通过河段文氏等效,获得估算的天然河流水体流量。经实例验证,该方法计算精度较高,达到流量测验规范要求,可作为流量估算的一种辅助手段。
The common flow acquisition methods in the flow test are conventional hydrometric cableway current meter, ultrasonic time difference method, acoustic Doppler current profilers(ADCP) and radar wave current meter. According to Bernoulli’s law, the increase of flow velocity is accompanied by the decrease of fluid pressure. That is, the Venturi phenomenon that the flow velocity increases when the confined flow passes through the reduced cross section. This phenomenon has been widely applied to measure the flow rate of single-phase steady fluid in closed pipelines. Based on the Venturi effect and Venturi model, the equivalent formula of Venturi river is derived. In conclusion, the calculation of the method produces higher precision which can meet the standard requirements of flow test.
作者
胡兴艺
HU Xingyi(Hydrology and Water Resources Survey Bureau of Hunan Province, Changsha 410007,China)
出处
《水文》
CSCD
北大核心
2019年第2期72-75,共4页
Journal of China Hydrology
基金
湖南省重大水利科技项目"湖南省流量在线监测综合测试关键技术研究"(2017-230-10)
