Fig 5 - uploaded by David Stefan
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The decelerated swirling flow often breaks down into helical structure which is unstable and causes
unsteady velocity and pressure fields. The numerical and experimental investigation of this flow
pattern is carried out on the experimental apparatus consisting of the swirl generator (source of strong
swirling flow) and the conical diffuser (equippe...
Contexts in source publication
Context 1
... precessing vortex rolls up and decays periodically generating the synchronous pressure pulsations. One period of the vortex decay is captured in series of images presented in Fig.5. (2) where the index number i = 1 -5 refers sensors order in the flow direction. ...
Context 2
... closer visual observation of image ensemble it was found that the upstream part of the vortex rotates faster than the downstream part. Consequently the vortex spiral turns into the loop and collapses upstream in form of straight short vortex (see t = 0.013 -0.034 sec in Fig.5.). While the frequency magnitudes of asynchronous pulsations are equal in the first and second cross- sections, the frequency magnitudes decrease in the third and fourth cross-section. ...
Context 3
... has to be noted that while the experimental observation is presented for flow rate Q = 13.5 l/s (due to the strongest cavitation well visualizing the vortex core) the numerical results presented below are for flow rate Q = 7 l/s and no cavitation. Nevertheless comparing the Fig.9 with Fig.5 it is clear that the numerically computed collapse of the spiral vortex is well correlated with the experimental one. ...
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