基于流量调节阀的变量喷灌装置设计与试验

Design and Experiment of Variable Rate Sprinkler Irrigation Based on Flow Control Valve

摘要:

为实现Senninger i-Wob2型喷头的喷灌流量精准变量调节，在喷头前安装V型流量调节阀作为执行机构，通过阀体水力性能试验，建立阀前压力、阀体开度和喷头流量之间的数学关系，据此设计变量喷灌控制系统，实现喷灌流量的精准调节。研究结果表明：确定压力-开度-流量的数学模型特征流量系数KL为20.40，阀后压力预测系数KP为0.97，流量预测系数Kφ为7.08;喷头射程和流量在相对开度为60%前，随阀体开度变化较为明显;而在相对开度为60%后，射程与流量随相对开度的变化幅度越来越小;调节阀流量调节的稳态相对偏差不超过6.67%，调节时间不超过42 s，测量精度在96%以上。该研究实现了基于流量调节阀喷灌流量的精准控制，为流量调节阀在变量灌溉中的应用提供了数据支持。

Abstract:

Aiming at the problem that the current sprinkler flow control is not fine enough, the precise variable adjustment of the irrigation flow of the Senninger i-Wob2 sprinkler was realized by installing a V-type flow control valve in front of the sprinkler as an actuator. Through the hydraulic performance test of the valve body, the mathematical relationship between the pressure before the valve, the opening of the valve body and the flow of the nozzle was established. According to the mathematical relationship, the overall structure of the variable irrigation control was designed, and the specific operation steps of the control structure were clarified, so as to realize the precise adjustment of the irrigation flow. The results showed that the flow calculation formula and the calculation method of the corresponding parameters were established, and the characteristic flow coefficient KL of the mathematical model of pressure-opening-flow was 20.40, the pressure prediction coefficient KP after the valve was 0.97, and the flow prediction coefficient Kφ was 7.08 through the hydraulic performance test data of the valve body. The range and flow rate of the nozzle changed obviously with the valve opening before the opening of 60%. However, after the opening was 60%, the range and flow rate changed with the valve opening was getting smaller and smaller;the steady-state relative deviation of the flow regulation of the control valve did not exceed 6.67%, the adjustment time did not exceed 42 s, and the measurement accuracy was above 96%. The research result realized the accurate regulation and control of sprinkler irrigation flow through the flow control valve, and provided strong data support for the application of flow control valve in variable irrigation.