外取水射流喷头与全射流喷头的比较

Compared between outside signal fluidic sprinkler and complete fluidic sprinkler

为了解决全射流喷头信号嘴不便调节及旋转不稳定的问题,对全射流喷头信号嘴取水方式及喷体结构进行改进,提出了一种新型射流喷头——外取水射流喷头.采用外部取水信号嘴可以更加方便、直观地进行调节,外部信号嘴又可以起到分水针的作用,促进高速水流的裂变,提高了喷洒的雾化程度以及均匀性.双喷体结构的采用减弱了喷头在工作过程中偏离铅垂方向的现象.选取PXH型全射流喷头进行对比试验.结果表明,相同压力下,外取水射流喷头的射程比全射流喷头增加2.5%左右,且平均雨滴直径减小0.5 mm左右,因此其雾化效果也更好.外取水射流喷头径向水量分布曲线呈"三角形",比全射流喷头更有利于组合分布.采用Matlab语言对喷头组合分布均匀性进行仿真计算,在方案所选间距中,提出工作压力分别为0.15,0.20,0.25 MPa时,外取水射流喷头正方形布置最佳组合间距为R,1.1R和R,组合均匀系数值分别为78.3%,83.9%和87.6%.

With the aim to solve the structural problem of complete fluidic sprinkler,a new kind of fluidic sprinkler—outside signal fluidic sprinkler was proposed,which has outside signal fluidic element and double nozzle. Outside signal fluidic element made it more convenient to adjust. The high-speed jet were crushed. As a result,its atomization and uniformity coefficient were improved. The structural of double nozzle made the sprinkler more stable. PXH complete fluidic sprinkler for compared experiments. The experimental results demonstrated that,at the same pressure,radius of outside signal fluidic sprinkler is relatively 2. 5% larger than complete fluidic sprinkler,and the average raindrop diameters is about 0. 5 mm smaller than complete fluidic sprinkler. So the atomization performance of outside signal fluidic sprinkler is more superiority. The shape distribution of outside signal fluidic sprinkler wastriangle which is more helpful for combination than complete fluidic sprinkler. The combination uniformity coefficient were simulated using the Matlab program,the best combination distances of outside signal fluidic sprinkler at the pressure of 0. 15 MPa,0. 2 MPa and 0. 25 MPa were R,1. 1R and R among the combination distances were chosen,and the combination uniformity coefficient values were78. 3%,83. 9% and 87. 6% respectively.