In the moving blades of an impulse turbine, steam loses velocity and pressure does what?

In an impulse turbine, when steam passes through the moving blades, it undergoes a change in velocity as it is directed toward the blades by the nozzles. The key characteristic of impulse turbines is that they operate on the principle of converting the kinetic energy of the steam directly into mechanical energy without a significant change in pressure.

As the steam strikes the blades, it loses velocity as it transfers energy to the turbine rotor, causing the rotor to spin and produce work. During this process, the pressure remains relatively constant. This is because the design of the impulse turbine allows the steam to drop in velocity while maintaining pressure, as the energy conversion occurs primarily through the dynamic movement of the steam rather than through changes in pressure.

In summary, as steam loses velocity in the moving blades of an impulse turbine, the pressure effectively remains unchanged during this interaction, reflecting the efficiency of the system in producing mechanical energy while keeping pressure stable.