Experimental constants include : ambient temperature 291k ~ 301k , rh 15 % ~ 21 . 2 % , wind velocity 3 . 2m / s at the nozzle position and horizontal to the spray fan , others are same as the fore experiment . the tendency of the two experiments results is consistent with the tendency from simulation . that indicate the improved shield spray is better than the original shield spray in reducing spray drift , and also more better than conventional spray without shield 风洞试验参数：喷雾药液为含1 bsf的水溶液，风速1 . 4m s ，风向垂直于喷雾扇面，温度281k 288k ，相对湿度rh9 20 ；室内试验参数：喷雾药液为含2 bsf的水溶液，喷头处风速为3 . 2m s ，风向平行于喷雾扇面，温度291k 301k ，相对湿度rh15 21 . 2 ；分别在喷头下风向喷幅外的空中和地面布点收集飘失和飘移沉积的雾滴量，作为评价减少雾滴飘失效果的指标：试验结果表明：改进后的罩盖喷雾减少雾滴飘失的效果好于双圆弧未开口罩盖喷雾，常规无罩盖喷雾的雾滴飘失量大于开口罩盖喷雾。
Abstract : according to the continuative condition of the tangential fields on the slot aperture which is the inclined narrow - slot on the broadwall of a sectoral waveguide , the moment method is used to calculate the magnetic current coefficient and distribution . then the scattering field , the scattering parameter and the equivalent impedance are obtained . leting only the te11 dominant mode propagates in the waveguide , the scattering parameters and the normalized equivalent series impedance in the x - band are computed . the basis disigned the slot antenna and the slot array is offered 文摘:根据缝隙口面切向场的连续条件，采用解析数值法矩量法，对扇面波导宽壁上窄的斜缝进行了计算，解得了磁流系数及其分布，并得到散射场、等效散射参量及等效阻抗等重要参数.假定波导中仅有te11主模传输，在x波段计算了散射参量和归一化等效串联阻抗，给出计算结果，为缝隙天线和缝隙阵列设计提供了依据
