An analysis of unsteady torque on a quasi-three-dimensional centrifugal impeller
Abstract
The effects of a change in the breadth of a centrifugal impeller on unsteady torque are determined on the assumption of a quasi-three-dimensional flow. Small sinusoidal fluctuations of rotational velocity and/or flow rate are considered. The unsteady torque is divided into three components: quasi-steady, apparent mass, and wake. Numerical results show that the wake component is usually smaller than the other components. Apparent mass coefficients for the two disturbances are given for quasi-three-dimensional impellers. It is found that the outer-to-inner breadth ratio has little effect on the apparent mass coefficient for flow-rate fluctuation, but the coefficient for rotational fluctuation is larger for impellers with smaller outer-to-inner breadth ratios.
- Publication:
-
JSME International Journal Series B
- Pub Date:
- October 1984
- Bibcode:
- 1984JSMEB..27.2166T
- Keywords:
-
- Centrifugal Compressors;
- Computational Fluid Dynamics;
- Impellers;
- Three Dimensional Flow;
- Torque;
- Unsteady Flow;
- Analytic Functions;
- Angular Velocity;
- Flow Velocity;
- Sine Waves;
- Fluid Mechanics and Heat Transfer