Drag torque意思

"Drag torque" is a term used in various contexts, but it is most commonly associated with fluid dynamics and the study of rotating objects in fluids. In this context, drag torque refers to the torque exerted by a fluid on a rotating object due to drag or friction.

When an object is rotating in a fluid, such as an airplane wing or a turbine blade moving through air, or a ship's propeller moving through water, the fluid exerts a resistive force on the object. This force is called drag, and it acts in a direction opposite to the object's motion. The torque associated with this drag force is known as drag torque.

Drag torque can have a significant impact on the performance of rotating objects, affecting their speed, efficiency, and stability. Engineers often design objects to minimize drag torque, using techniques such as streamlining, the use of low-drag materials, and the control of rotational speed.

In the context of electrical engineering, "drag torque" may also refer to the torque exerted by a magnetic field on a rotating electrical device, such as a motor or generator. In this case, the drag torque is caused by the interaction of the magnetic field with the device's moving parts, and it can affect the device's performance and efficiency.