The influence of guide vane opening on pressure pulsation characteristics and flow-induced noise in Francis turbine
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Abstract:
In or der t o study the influence of different g uide v ane o penings on the pressur e pulsat ion characteristics and flow2in2 duced no ise in Fr ancis tur bine, we used CFD and LM S Virtual Lab softw are to calculate t he unsteady flow field and sound field in a Francis turbine under three g uide v ane o pening degr ees. The results showed that the pressure pulsat ion in the Francis tur2 bine was mainly affected by the r otation fr equency of blade ( 1081 33 H z) and the low2fr equency pressur e2pulse ( 41 15 Hz) . With the increase of t he g uide v ane opening, the influence of blade frequency on the pr essure pulsatio n in t he inlet of the r unner and the v olute w ould g radually increase. The distributio n of o utfield noise accor ded w ith the g eometric contour of the Fr ancis tur2 bine. T he elbow section o f the draft t ube w as helpful for the attenuation o f the flow2induced no ise of the Francis turbine. T he gr eat er the guide vane opening , the g reater the sound pr essure of the exter na l no ise g enerat ed by the Francis tur bine, and the more o bv ious the dipo le cha racteristics. The research results can pr ovide a r efer ence fo r the stable o per atio n o f Francis turbine and the co nt rol of flow2induced noise.
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