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- W2170854908 abstract "In industrial applications turbomachines are not only used at their design point, but also at significant lower or higher flow rates. This operating range is limited on the low flow rate side by instabilities in flow-leading parts of the machinery. For these operating conditions vortices are created due to the separation of the boundary layer from the walls of the flow-leading parts of the machine, e. g. in the impeller. These unique or multiple stall cells can start to propagate at a fraction of the rotor speed in the impeller when the flow is further throttled. They induce very strong pressure oscillations and as a result machine parts can even be destroyed. It is very difficult to describe these phenomena physically and especially mathematically, because they depend on many operational parameters of the considered turbomachine. In the present experimental set-up a radial pump is investigated for various operating conditions down to rotating stall. To investigate the flow field in every channel of the impeller Time-Resolved PIV is used, so that measurements in transient and unsteady flows inside the rotating system become possible. In this study acquisition frequencies of 50 Hz, 500 Hz and 800 Hz are used with a 1280x1024 pixel CMOS-camera. For a frequency of 50 Hz a measuring series consists of 500 double pictures. This means that it is possible to measure the flow field over 100 rotations of the impeller. These measurements are used to calculate the frequency of the stall cell. The higher acquisition frequencies are used to investigate and characterise in more details the flow field in the impeller. The flow field is measured in each channel of the impeller at the same position. In order to determine the circumferential speed of the rotating stall in the impeller a frequency analysis is applied to the measured flow field. For this, each individual velocity vector in the flow field is analyzed using FFT both for the direction and the magnitude of the vector. To obtain a characteristic frequency spectrum of the flow field the mean value is then obtained through averaging of the separate frequency spectra for each vector. The oscillation frequency of the flow field and thus the displacement speed of the rotating stall cell can be determined in that way from the measured velocity fields." @default.
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- W2170854908 date "2006-01-01" @default.
- W2170854908 modified "2023-09-27" @default.
- W2170854908 title "INVESTIGATION OF OFF-DESIGN CONDITIONS IN A RADIAL PUMP BY USING TIME-RESOLVED-PIV" @default.
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