2018
DOI: 10.1155/2018/5796875
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Experimental Study of a Low‐Specific Speed Francis Model Runner during Resonance

Abstract: An analysis of the pressure in a runner channel of a low-specific speed Francis model runner during resonance is presented, which includes experiments and the development of a pressure model to estimate both the convective and acoustic pressure field from the measurements. The pressure was measured with four pressure sensors mounted in the runner hub along one runner channel. The mechanical excitation of the runner corresponded to the forced excitation from rotor-stator interaction. The rotational speed was us… Show more

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Cited by 8 publications
(6 citation statements)
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“…The method is not perfect and typically overestimates the eigenfrequency, but its value lies in the understanding it provides for the resonance phenomena in such runners. It also provides an explanation to the shape of the pressure field found in a Francis Runner operating at resonance [10] where a standing wave between the inlet and outlet was observed.…”
Section: Introductionmentioning
confidence: 88%
“…The method is not perfect and typically overestimates the eigenfrequency, but its value lies in the understanding it provides for the resonance phenomena in such runners. It also provides an explanation to the shape of the pressure field found in a Francis Runner operating at resonance [10] where a standing wave between the inlet and outlet was observed.…”
Section: Introductionmentioning
confidence: 88%
“…The draft tube of the testrig was an elbow-type. The Francis turbine in the test-rig is shown in Figure 1 [12]. Measurements were performed on two runners in the Francis test-rig.…”
Section: Methodsmentioning
confidence: 99%
“…The Francis test-rig, including the high and low pressure vessels. The figure is reproduced from Agnalt et al 2018[12].…”
mentioning
confidence: 99%
“…The Francis-99 runner has undergone multiple experimental campaigns in the recent years, including hydraulic and structural measurements. For this paper the work conducted by Agnalt et al [4] and Solemslie et al [5] are used as a basis for the presented study. The basis is a submerged, non-rotating, modal test, artificially excited at specific ND-patterns, and the results show multiple eigen modes for all ND-patterns within the frequency range 200 Hz to 600 Hz [5].…”
Section: Previous Workmentioning
confidence: 99%
“…The basis is a submerged, non-rotating, modal test, artificially excited at specific ND-patterns, and the results show multiple eigen modes for all ND-patterns within the frequency range 200 Hz to 600 Hz [5]. On the contrary, Agnalt et al [4] used the convective rotor/stator interaction between the guide vanes and rotating runner blades to enable the natural excitation of the turbine. For the optimal guide vane opening α GV , a discreet "BEP-sweep" was performed by increasing the head and the rotational speed accordingly to retain the optimal value of the speed factor n ED .…”
Section: Previous Workmentioning
confidence: 99%