猪舍喷雾降温系统气流喷孔形式对流场影响的实验分析

Analysis of Air Flow Distribution Controlled by Different Nozzles for Misting Cooling System in Livestock Houses

局部环境射流控制喷雾蒸发降温系统是适用于我国南方夏季炎热地区开放型猪舍的局部送风降温系统。在该降温系统中，控制区域中的风速分布对降温效果影响很大，而影响风速分布的重要因素之一就是射流喷孔形式。在相同的气流出口流量的条件下，使用热球式风速仪分别对圆形、环形及环形旋流气流喷孔射流在控制区域所形成的风速分布进行了测量，在满足猪对风速范围要求的情况下，按照风速分布尽量均匀的原则，对各种形式气流喷孔的性能进行实验分析，实验结果表明对于该降温系统环形旋流喷孔的性能最优，在设计时应优先选用环形旋流气流喷孔。

Evaporative misting cooling system, which was controlled by jet, has been developed for open swine houses in South China .In this system air flow distribution greatly affects the efficiency of evaporative cooling and the livestock physiology . Various jets have different characteristics on air flow in local places where is been cooling . The air flow distribution was measured by heatglobe anemoscope. In the case of range of air flow that meets the demands of pigs, experimental analysis on performance of various kinds of jets was carried out according to the principle of welldistributed air flow . The experiment showed that the performance of circular revolving nozzle of the cooling system was excellent . The circular revolving nozzle should be chosen as the first consideration in designing the cooling system.