Abstract
This contribution is focused on analysis of pressure losses in spiral case of centrifugal pump with thick trailing edges and with recirculation channels. Recirculation channels have different geometrical configuration and influence the size of available specific energy as well as hydraulic efficiency. Subsequently, the contribution analyses the flow in spiral case itself with respect to its function and its filling with liquid. Studied phenomena affect the research of pumps with low specific speed, the stability of specific energy characteristic curves and also the configuration of recirculation channels.
Highlights
The characteristics of centrifugal pump are primarily by dependency of specific energy and efficiency on flow rate
This contribution is focused on analysis of pressure losses in spiral case of centrifugal pump with thick trailing edges and with recirculation channels
These are static characteristics despite describing the actions that are considerably dependent on the rotation of the machine. From these static curves can be deduced some dynamic characteristics of the machine e.g. stability of specific energy curve. As it is clear from definition of Euler turbine or pump equation the real specific energy curves will be influenced by the losses inside the centrifugal pump
Summary
The characteristics of centrifugal pump are primarily by dependency of specific energy and efficiency on flow rate These are static characteristics despite describing the actions that are considerably dependent on the rotation of the machine. The energy dissipation can characterize stability of specific energy curve as well as dynamic characteristics of centrifugal pump It is important how the impeller, gaps between hub or shroud and pump stator parts and spiral case participate on total pressure losses. It manifests that especially the spiral case can have a significant impact on the stability. From the view of losses different distribution of dissipated power between the spiral case and remaining parts occurs [3]
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