A volute or spiral housing that directs fluid into or out of a rotating impeller. The cross-sectional area gradually changes along the spiral path to maintain a uniform fluid velocity as it enters the runner or to convert kinetic energy into pressure as it exits. It is heavily used in centrifugal pumps, turbochargers, and Francis turbines.
Heard on the job
The pressure drop across the scroll looks too high for this flow rate.
Also heard as
- volute
- scroll casing