Author(s): Andrej Predin
Linked Author(s):
Keywords: Radial turbomachines; Operating characteristics; Secondary flow; Secondary flow addition
Abstract: This paper gives the experimental analysis results of added secondary flow influence on the operating characteristics of the radial turbomachines. The secondary flow is added at the impeller entrance through the guide system, which ends with the circlering at the impeller intake diameter nearby the impeller front shroud. The guide vanes are set in the circle-ring guide system in the direction of the intake pipe axis. They assure the axial symmetrical non-whirl secondary flow at the impeller intake. The atmospheric, meaning non-force driven secondary flow loading is performed with the volute guide system placed at the entrance of the circle-ring guide system. Based on the presented experimental results, it can be concluded that the secondary flow favourably influences on the operating characteristic of the radial impellers (13< n q< 35). The stable operating area increases in the direction of the small operating capacities (thus giving the possibility of wider pump regulation). At the same time the overall efficiency is increased, especially in the area of the small, and under optimal capacities.
Year: 1999