Phase Resonance in Centrifugal Fluid Machinery : A Comparison between Pump Mode and Turbine Mode Operations and a Discussion of Mechanisms of Flow Rate Fluctuation through a Stator :A Comparison between Pump Mode and Turbine Mode Operations and a Discussion of Mechanisms of Flow Rate Fluctuation through a Stator

Yonezawa, Koichi; Toyahara, Shingo; Motoki, Shingo; Tanaka, Hiroshi; Doerfler, Peter; Tsujimoto, Yoshinobu

doi:http://dx.doi.org/10.5293/IJFMS.2014.7.2.042

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자료유형: 학술저널

저자정보: Yonezawa, Koichi Toyahara, Shingo Motoki, Shingo Tanaka, Hiroshi Doerfler, Peter Tsujimoto, Yoshinobu

저널정보: 한국유체기계학회 International Journal of Fluid Machinery and Systems International Journal of Fluid Machinery and Systems Vol.7 No.2

발행연도: 2014.6

수록면: 42 - 53 (12page)

DOI: http://dx.doi.org/10.5293/IJFMS.2014.7.2.042

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Phase resonance in Francis type hydraulic turbine is studied. The phase resonance is a phenomenon that the pressure fluctuation in the penstock of hydraulic turbine installation can become very large when the pressure waves from each guide vane caused by the interaction with the runner vane reach the penstock with the same phase. Experimental and numerical studies have been carried out using a centrifugal fan. In the present study, comparisons between the pump mode and the turbine mode operations are made. The experimental and numerical results show that the rotational direction of the rotor does not affect characteristics of the pressure fluctuation but the propagation direction of the rotorstator interaction mode plays an important role. Flow rate fluctuations through the stator are examined numerically. It has been found that the blade passing flow rate fluctuation component can be evaluated by the difference of the fluctuating pressure at the inlet and the outlet of the stator. The amplitude of the blade passage component of the pressure fluctuation is greater at the stator inlet than the one at the stator outlet. The rotor-stator interaction mode component is almost identical at the inlet and the outlet of the stator. It was demonstrated that the pressure fluctuation in the volute and connecting pipe normalized by the flow rate fluctuation becomes the same for pump and turbine mode operations, and depends on the rotational direction on the interaction mode.

#centrifugal fluid machinery #turbine #Phase resonance #rotor-stator interaction #flow rate fluctuation #pump

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