旋转式喷头转速对水力性能影响试验研究

Effects of Rotational Speed of Sprinkler on Hydraulic Performance

以Nelson R33旋转喷头为样机，通过设置10种不同粘度的阻尼油脂来调节喷头的转速，对其进行水力性能试验分析。结果表明，使用不同粘度的阻尼油脂可以显著改变喷头转速，当采用粘性最大的阻尼油脂KL704时，喷头在150kPa和200kPa工作压力下转速分别为0．085r／min和0．26r／min，而无阻尼时，喷头转速为202r／min和229．59r／min。同时发现，在150kPa和200kPa工作压力下喷头转速低于20r／min时，随着转速的增加射程逐渐减小，减小程度为25％～26．9％，而转速高于20r／min时，喷头射程随着转速变化的幅度趋于平缓。综合转速对射程及组合灌溉均匀度的影响，喷头转速为1r／min左右，更有利于组合喷灌的均匀性及系统布置的经济性。

To explore the effect of rotational speed of sprinkler on hydraulic performance, 10 different viscosities damping oil were set to adjust the rotational speed based on the Nelson R33 sprinkler. The results indicated that the viscosity of damping oil could significantly change the rotational speed of the sprinkler. Under the pressures of 150 and 200 kPa, the rotational speed ranged from 0. 085 to 0.26 r/min without damping oil while the rotational speed ranged from 202 to 229.59 r/min with the maximum viscosity oil of KL704. The sprinkler range decreased greatly with the increase of rotational speed under the rotational speed below 20 r/min, whose decreasing amplitude ranged from 25 % to 26.9 %, while the sprinkler range tended to change stably with the rotational speed above 20 r/min. Considering the effects of rotation speed on sprinkler range and sprinkler irrigation uniformity comprehensively, it was more conducive to the combined sprinkler irrigation uniformity and the economy of system arrangement that the rotational speed was about 1 r/min under pressures of 150-200 kPa.