不同工况对喷灌水量分布的影响

为了探究不同工况对射流式喷头喷灌水量的影响,通过对射流式喷头在不同组合间距和工作压力下的水量分布数据进行分析,拟合出了喷头在不同工作压力及组合间距下的降水强度,采用克里斯琴森均匀系数和分布均匀性系数计算了相应的喷灌均匀度.结果发现喷头组合间距在1.0R~1.4R变化时正方形组合喷灌的CU值随喷头间距的增大呈下降趋势,CU值均大于70%;1.0R和1.2R组合间距下正方形组合喷灌低值区域的占比比三角形组合高,而1.4R的组合间距则与上述相反;当压力由0.1 MPa升至0.3 MPa时三角形组合喷灌区域的灌水峰值随着压力的增大呈先减小后增大的趋势;在正方形组合形式下增大工作压力有利于提高喷洒区域内的均匀性;压力损失并不总是降低喷灌的均匀性,0.2~0.3 MPa压力下,10%的压力损失对喷头喷灌均匀性几乎没影响;射流式喷头1.4 m安装高度、0.25 MPa压力下宜采用1.4R间距的三角形组合.

Effect of different working conditions on water for sprinkler irrigation

To explore the influence of different working conditions on water distribution of fluidic sprinkler,the best sprinkler uniformity was about to achieved.Through the analysis of water distribution data in different combination spacing and pressure,the precipitation intensity was fitted.The Christian-sen and distribution uniformity coefficient were used to calculate the corresponding sprinkler irrigation uniformity.The results show that CU values of square combination sprinkler irrigation decreases with the increase of sprinkler head spacing between 1.0R and 1.4R,and the CU values are all greater than 70%.The proportion of sprinkler intensity in the low-value is higher in square combination than that in the triangle combination under the combination spacing of 1.0R and 1.2R.While the combination spa-cing of 1.4R is opposite to the above.When the pressure increases from 0.1 MPa to 0.3 MPa,the peak irrigation value in the triangular combination decreases first and then increases with the increase of the pressure.The uniformity of spraying area is improved as increasing working pressure under square combination.The pressure loss do not always reduce the uniformity of sprinkler irrigation.The pressure loss of 10%has little impact on the uniformity of sprinkler irrigation under the pressure of 0.2-0.3 MPa.The triangular combination with 1.4R spacing should be adopted under the installation height of 1.4 m and pressure of 0.25 MPa.