Question 59Gas Turbine - Assistant Engineer

The correct answer is B) Impulse-Reaction. In a high-pressure (HP) turbine, the impulse-reaction type of construction is generally utilized to keep the exit pressures relatively constant across the turbine blades. This design combines both impulse and reaction principles, where the first stage is impulse-based and the later stages incorporate reaction principles. This allows for a more uniform pressure distribution and efficient energy extraction across the turbine blades. The other options are not the most suitable for this purpose. Curtis and Rateau designs are primarily impulse-based, while a pure impulse construction would not provide the same level of pressure control across the blade stages.