Trykkpulsasjoner inne i et Francis løpehjul

Unsteady synchronized pressure and velocity measurements were performed in the high head model Francis turbine during load rejection from BEP to PL. The aim of the study

The applied research is focused on the Francis-99 runner, a model runner of a High Head Francis turbine, which has been instrumented in order to study the

The position sensor was used to analyse the onboard measurements relative to stationary domain. The raw signal from the position sensor was +- 10V saw tooth signal representing

The transient measurements were done using miniature pressure transducers and linear strain gages placed at four different locations along the pipe length.. All output signals from

Further one can see in Figure 6 that the value T stress is decreasing, meaning that the rotating mass is relieved; the overall trend is due to the reduction of rotational speed,

Experimental studies (using second approach) on a Francis turbine showed that the pressure amplitudes during the transient cycles can vary up to three times that of the steady

The maximum increase and decrease in the grid frequency over a 440 seconds interval have been investigated, in addition to an extreme event where the frequency decreased far below

When the runner cone extension is rotating freely it will only be driven by the free vortex in draft tube and thereby reduce the tangential velocity and pressure pulsation