叶轮是流体机械中的要害部件，广泛应用于泵、风机、压缩机和涡轮等设备中。它由装置在旋转轴上的多个叶片组成，旨在通过旋转来通报机械能给流体或从流体获取机械能。当叶轮旋转时，它能够增加经过的气体或液体的速度和压力，或者在涡轮的情况下，利用流体的能量来驱动机械运动。

The impeller is a critical component in fluid machinery, widely utilized in devices such as pumps, fans, compressors, and turbines. It comprises multiple blades mounted on a rotating shaft, designed to transfer mechanical energy to a fluid or extract energy from it through rotation. When the impeller rotates, it can increase the speed and pressure of the passing gas or liquid, or in the case of a turbine, use the energy of the fluid to drive mechanical motion.