Taking the Hudson TB 12 ( 4 ) type fan as an example, this paper gives an analysis and comparison between the pitch angle and speed controls for air flow of the air cooler fans and reviews the economy of both the methods of control.

• 本文以哈德森(HUDSON)TB12(4)型风机为例,对空冷器风机流量的调角调节和调速调节进行分析对此,并评述了这两种调节方法的经济性。