摘要
在室内将3种类型的灌水器置于自制水槽中,进行了灌水器的淹没出流试验。试验结果表明:灌水器在淹没出流时的出流规律与自由出流相同,但淹没时的流量略小于对应压力下自由出流的流量,其流量变化率多在10%以内;相比之下,低压时流量变化率比高压时大,即在灌水器额定工作压力(10m)附近,淹没出流对其影响较小。统计特征表明,灌水器淹没后出流更加均匀。不同灌水器类型对淹没与否的敏感程度有所差异,微管灌水器最为明显,其次是内镶式,补偿式变化很小。升降压过程中,降压过程的淹没出流对灌水器的流量变化率均小于升压过程。
Emitter's hydraulics under submergence condition were tested in laboratory. Compared with exposing in air, there is a same rule of emitters' discharge and less effect with increasing the inlet pressure to their designed head when the emitter immersing water. The statistical data shows that there is a higher uniform when emitters submerge in water than they expose in air. From micro-pipe to labyrinth and pressure compensation emitter, the effect of submergence becomes un-conspicuous. Discharges are larger in the rising work pressure than lowering emitters' during the working pressure of emitter changes.
出处
《灌溉排水学报》
CSCD
北大核心
2004年第5期59-61,共3页
Journal of Irrigation and Drainage
基金
国家自然科学基金资助项目(50079029)
国家"十五"重大科技攻关资助项目(2002AA2Z4091)
