Quick coupling valves are commonly used to make an easy and quick connection/disconnection of a sprinkler to/from the supporting pipeline. However, significant headloss occurs during the operation of the irrigation system by this valve. In the present study, water flow through a standard quick coupling valve was numerically modelled by computational fluid dynamics (CFD). In addition, different turbulence models were run to determine the effect of any component of the valve on flow characteristics. Comparison between numerical and observed data from the experiments on the prototype confirmed the validity of standard k-ε as a high precision model. Three-dimensional numerical simulation of the steady-state flow under different rates of flow showed that the spring had the least negative effect among the installed components inside the quick coupling valve. On the other hand, the body length of the valve, especially the length of the inlet part of the valve, played the main role in the pressure drop. Unexpectedly, the installed sealing O-ring reduced the headloss. Moreover, an effective modification was carried out on the components of an ordinary valve by increasing by 20 mm the length of the valve from the inlet side and modifications in trim elements. Finally, the findings revealed that 50% of headloss occurred in the developed valve compared to the ordinary type regardless of the flow rate.

中文翻译：

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用于加压灌溉的有效快速耦合阀的优化*

快速连接阀通常用于使洒水喷头与支持管道之间轻松快速地连接/断开。然而，在灌溉系统通过该阀运行期间会发生显着的水头损失。在本研究中，通过计算流体动力学 (CFD) 对通过标准快速耦合阀的水流进行数值模拟。此外，还运行了不同的湍流模型来确定阀门的任何组件对流动特性的影响。原型实验的数值和观测数据的比较证实了标准k的有效性-ε 作为高精度模型。不同流量下稳态流动的三维数值模拟表明，在快速耦合阀内部安装的组件中，弹簧的负面影响最小。另一方面，阀门的阀体长度，尤其是阀门入口部分的长度，对压降起主要作用。出乎意料的是，安装的密封 O 形圈降低了水头损失。此外，通过将阀门从入口侧的长度增加 20 毫米并修改内件元件，对普通阀门的组件进行了有效的修改。最后，研究结果表明，与普通类型的阀门相比，无论流量如何，开发的阀门都会发生 50% 的水头损失。