Flow in the Volute
Radial inflow turbines for turbocharging - Modelisation

In small centripetal turbines, the assembly commonly referred to as the “volute” accounts for approximately half of the energy loss, regardless of thermal losses. It is therefore necessary to be able to analyze the power dissipated by the fluid in this poorly understood part of the turbine. A kinematic study of the gas in the volute is essential to determine, with a good approximation, the velocity components.

For example, Euler’s theorem (§ 4.2 of [BM 4 570] ) shows that we must know the velocity vector at the impeller inlet to determine the theoretical power output...