葉輪是流體機械中的關鍵部件，廣泛應用于泵、風機、壓縮機和渦輪等設備中。

它由安裝在旋轉軸上的多個葉片組成，旨在通過旋轉來傳遞機械能給流體或從流體獲取機械能。

當葉輪旋轉時，它能夠增加經過的氣體或液體的速度和壓力，或者在渦輪的情況下，利用流體的能量來驅動機械運動。

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.