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Ebm-papst presented the HyBlade fan series for the first time in 2007, which improved the noise behavior and efficiency of large axial fans. [39] The AxiEco fan series was introduced in 2019. Due to the three-dimensional shape of the fan blade, it was possible to achieve a higher level of pressure stability for axial fans.
A variable pitch fan is similar in concept to that of a variable-pitch propeller and involves progressively reducing the pitch (or blade angle) of the fan on a turbofan as the engine is throttled. Although variable pitch fans are used in some industrial applications, the focus of this article is on their use in turbofan engines .
Where noise is an issue, larger, slower-turning fans are quieter than smaller, faster fans that can move the same airflow. Fan noise has been found to be roughly proportional to the fifth power of fan speed; halving the speed reduces the noise by about 15 dB. [22] Axial fans may rotate at speeds of up to around 38,000 rpm for smaller sizes. [23]
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