A velocity compounded impulse turbine is a type of impulse turbine in which the steam velocity is reduced in stages by using multiple moving blades arranged on the same rotor. It is designed to extract energy from high-velocity steam efficiently when the pressure drop is taken only across the nozzle and not across the moving blades. This turbine is generally used where a large pressure drop is available in a single stage but it is not practical to convert all kinetic energy into mechanical work in one row of moving blades. In a velocity compounded impulse turbine, steam first expands in the nozzle, converting pressure energy into kinetic energy. The high-velocity steam jet then strikes the first set of moving blades, where part of the kinetic energy is transferred to the rotor, causing it to rotate. After passing through the first moving blade row, the steam enters the fixed blade row known as the guide or reversing blades. These fixed blades change the direction of steam flow without changing its velocity significantly. The steam then enters the second moving blade row, where more kinetic energy is extracted. This process may be repeated with multiple stages of moving and fixed blades.