摘要
对以色列最典型的3种重力滴灌灌水器的水力性能与内部流动机理进行研究。结果表明经典的流量压力关系模型完全适合于0.5～15.0m水头压力范围;灌水器流道断面统计平均流速在0.07～1.15m/s之间;流道内部流体流动的雷诺数为73～930,临界雷诺数比常规尺度流道的值要小;上下边界层厚度在0.12～0.65mm之间,占流道深度的15%～67%,表现为上下边界层充分发展的复杂流动。
The hydraulic performance and its mechanism of liquid flow in three representative gravity drip irrigation emitters in Israel were studied. Based on the freedom discharge test, the results showed that the classical model of relation between flux rate and pressure could totally fit for the pressure range from 0.5 m to 15.0m. The section average velocity of flow was between 0.07～ 1.15m/s in flow path of the emitters. The critical Reynolds number of liquid flow in the flow path of emitters was 73～930, smaller than that in general flow path. The thickness of up-down-direction boundary layers was 0.12～0. 65mm, took 15%～67% percent of the flow path depth, showed full expanded flow in up-down-direction boundary layers.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2005年第10期54-57,共4页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家自然科学基金资助项目(项目编号:50379053)
国家"863"高技术研究发展计划资助项目(项目编号:2002AA6Z3091)
关键词
重力滴灌
水力性能
流动机理
流道
Gravity drip irrigation, Hydraulic performance, Liquid flow mechanism, Flow path
