运水烟罩内折射式喷头性能参数分析及试验

为了降低油烟对环境的污染,研究了运水烟罩内固定喷头的喷射雾化特性对运水烟罩油烟净化效果的影响.对弧面扇形折射式喷头和折射锥角分别为115°,120°,135°,140°和150°的直面扇形折射式喷头进行试验研究,测量了这6个不同型号的折射式喷头在5种不同工作压力下的流速、射程、喷洒面积、粒径大小以及水量分布等参数的变化情况,分析了雾化性能,探寻各参数之间的关系及变化规律.结果表明：流速、射程、喷洒面积均与工作压力成正比;雨滴粒径大小与工作压力成反比;喷头的最佳工作压力为0.30 MPa;直面折射式喷头比弧面折射式喷头油烟净化效果好;120°折射直面扇形喷头水量分布最均匀,雾化效果最好,喷洒面积最大.

Experiment and analysis of performance parameters for refraction nozzle in vent wash exhaust hood

In order to reduce the effect of cooking fume pollution on environment,the influence on the cooking fume′s cleaning effect of avent wash exhaust hood by the atomizing characteristic of nozzle was discussed. The experiments of the globoidal sector and the angle including 115°,120°,135°,140°,150° of direct sector refraction nozzle were carried out. Several parameters, i.e., velocity of flow, range of the nozzle, spray area, size of grain, and water distribution for the six refraction nozzles were measured under five pressures. The atomization performance was analyzed. The relations between these parameters were determined. Through the experiments it was found that the inlet pressure is directly proportional to the velocity of flow, range of the nozzle and spray area. The inlet pressure is inversely proportional to the size of grain. The best working pressure of the vent wash exhaust hood is 0.30 MPa. The cooking fume′s clea-ning effect of direct sector is better than globoidal sector refraction nozzle. The angle of 120°was selected for straight refractive nozzle. Its uniformity coefficient, atomization and spray area are the best.