Axial And Radial Turbines By Hany Moustaphapdf - 2021

This equation highlights a fundamental design difference: In axial turbines, $U$ is constant across the stage (ignoring radial variations), simplifying the energy transfer analysis. In radial turbines, the change in radius from inlet to outlet provides a significant contribution to the work output via the $U_1 C_\theta 1$ term, allowing for high pressure drops across a single stage.