In a Curtis stage of a steam turbine, what separates the two rows of moving blades?

In a Curtis stage of a steam turbine, the separation between the two rows of moving blades is achieved by a row of fixed blades. In a typical Curtis turbine design, steam expands through the fixed blades, which serve as nozzles to direct the steam flow appropriately before it reaches the moving blades. This arrangement is crucial, as the fixed blades are strategically positioned to convert the steam's thermal energy into kinetic energy, ensuring efficient operation as the steam transfers to the moving blades for work extraction.

The role of the stationary fixed blades is significant because they not only help to guide the flow of steam but also facilitate the pressure drop necessary to increase the velocity of the steam before entering the next row of moving blades. This design minimizes energy loss and maximizes turbine efficiency, making it an integral part of the functioning of the Curtis stage.

In contrast, a set of stationary nozzles refers to a component that directs steam but is typically not the designation used within the Curtis stage context, as it specifically features fixed blades for steam distribution and expansion. The other options, such as a pressure chamber or cooling fins, do not directly pertain to the function of separating the moving blade rows in this type of turbine stage. The fixed blades are fundamental to achieving optimal steam