A CO2 transferring installation composed of propeller fan and perforated film duct and an underground heat exchange system combining CO2 transfering function are designed and tested. The two methods possess a high effect on the promotion of vegetable production. 设计并试验测试了塑料风管传输装置及兼有CO2传输功能的地下热交换系统,两者对改善系统内的CO2分布,提高蔬菜产量起到了明显作用。
Application of CDA Blade Shape in the Design of High Pressure and High Efficiency Propeller Fan CDA叶型在高压头、高效率轴流通风机设计中的应用
At present, there are propeller, ducted fan, turbine engines, and the 3 different power equipments in UAV. Ducted fan, because of its low fuel consumption, thrust, and other major advantage is becoming more and more popular. 目前,无人机主要有螺旋桨、涵道风扇、涡轮发动机等3种不同的动力设备,涵道风扇由于其耗油量低,推力大等优点越来越被重视,是本文的主要研究对象。