Blade exit Angle is one of the main geometrical parameters selected first in design.
叶片出口角是设计中首先选择的主要几何参数之一。
For the convenience of application, the blades are divided into: strong backward-curved blade (pump type), backward-curved arc blade, backward-curved straight blade and backward-curved airfoil blade;
为方便应用，我们将叶片分为:强后弯叶片(水泵型)、后弯圆弧叶片、后弯直叶片和后弯翼形叶片；
Radial outlet blade and radial straight blade;
径向出口叶片和径向直叶片；
Forward curved blade, strong forward curved blade (multi-wing blade).
前弯叶片，强前弯叶片(多翼叶片)。
Table 1 lists the approximate range of exit angles for these blade types in a centrifugal fan.
表1列出了离心式风机中这些叶片类型的出口角的大致范围。
4, the impeller is the only component that the fan transfers to the gas energy, so its design has a great impact on the fan;
4、叶轮是风机传递给气体能量的唯一元件，所以它的设计对风机影响很大；
Whether the main structure of the impeller can be correctly determined plays a key role in the performance parameters of the fan.
能否正确确定叶轮的主要结构，对风机的性能参数起着关键作用。
It includes the key technology of centrifugal fan design - blade design.
它包括离心风机设计的关键技术——叶片设计。
The key part of blade design is how to determine the exit Angle of the blade.
叶片设计的关键环节是如何确定叶片出口角。