轴流风机的特性

Characteristics of axial fan

（1）轴流风机入口空气的温度、湿度变化对流量的影响符合气体状态方程。实际生产中，其变化值也可参考机组喘振线的标定数据进行对比印证。

(1) the influence of the temperature and humidity of inlet air on the flow rate of the axial fan conforms to the equation of state of gas. In actual production, the change value can also be compared with the calibration data of surge line of unit.

（2）由于轴流风机主要是依靠叶栅的扩压作用来提高气体压力，气流冲角对叶栅的性能非常敏感。在实际应用中，一般通过改变静叶栅角度（即通常所说的静叶角度）来改变气流冲角，从而使机组的风量发生变化来调节风量，达到在满足工艺要求的前提下降低动力消耗。

(2) the axial flow fan is very sensitive to the performance of the cascade because it mainly relies on the expansion of the blade to increase the gas pressure. In practical application, usually by changing the blade angle (usually called static blade angle) to change the airflow angle, so that the unit volume change to adjust the air volume, reduce power consumption to meet the technical requirements.

（3）轴流风机动静叶片的叶型决定了叶栅的级压比和效率，决定了风机的整机性能。目前轴流风机的动静叶片大多为三元流设计，整机效率较高。但由于精度较高，若外部干扰因素造成叶片损伤或者叶片结垢即叶型发生了改变，那么压缩机的压缩比和效率就会下降，叶片的结垢问题还会造成轴流风机的操作范围变窄，在极端情况下会影响到轴系的动平衡而造成停机事故。

(3) the blade shape of the axial flow fan determines the stage pressure ratio and efficiency of the cascade, and determines the whole performance of the fan. At present, the static and dynamic blades of axial fan are mostly three yuan flow design, and the efficiency of the whole machine is higher. But because of high precision, if the external interference factors caused by changes in leaf damage or leaf blade scaling type, then the compression ratio and efficiency will decrease, but also the scaling problem caused by blade axial flow fan operating range, in extreme cases will affect the dynamic balancing of shafting caused downtime accident.