旋转式微喷头转速对水力性能影响的试验研究

通过试验分析了旋转式微喷头的转速对水力性能的影响,试验处理设置为:3种喷嘴直径,分别为1.4mm、1.8 mm和2.4 mm;5种阻尼脂量,分别为无阻尼、1/6阻尼脂、1/3阻尼脂、2/3阻尼脂和全阻尼。结果表明,利用阻尼脂可以显著降低微喷头的转速,在100~250 kPa工作压力下,微喷头的转速可以从无阻尼时的2230~4225 r/min降到全阻尼时的0.1~1.1 r/min。与无阻尼的高速旋转微喷头比较,低转速微喷头可以显著增加射程,在100~250 kPa工作压力时,其射程增加20.5%~31.8%。而在低转速区,微喷头的射程变化不大,在200kPa工作压力下,直径1.8 mm喷嘴微喷头转速从0.41 r/min增加到6.1 r/min时,射程仅降低4.4%。与无阻尼的高转速微喷头比较,低转速微喷头水量分布更趋近于三角形分布。

Effect of Rotation Speed of Micro-sprinklers on Hydraulic Performance

An experimental study was conducted to asses the effect of rotation speed on hydraulic performance of rotating micro-sprinklers.The results indicate that the damping grease can notably decrease the rotation speed,under 100~250 kPa pressure,the micro-sprinkler rotation speed decreases from 2230~4225 r/min without damping grease to 0.1~1.1 r/min with all the damping grease;comparing with high rotating speed,the throw distance of 1.8 mm nozzle microsprinkler in low rotation speed increases by(20.5%)~31.8% under 100~250 kPa pressure,while during the low rotation speed zone,the throw distance change vary little,At 200 kPa pressure,when the rotation speed of 1.8 mm nozzle micro-sprinklers increases from 0.41 r/min to 6.1 r/min,the throw distance decreases only by 4.4%;The distribution rate curve of slow-rotating micro-sprinklers is more like triangle than that of high rotating ones.