Experimental study on transient flow fluctuation characteristics in a 3 × 3 rod bundle under rolling condition
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C.-X. Yan
Abstract
Experimental investigation on adiabatic transient flow fluctuation characteristics in a 3 × 3 rod bundles subjected to rolling motion in normal pressure and temperature was carried out. Single-phase flow as well as gas parameters under stagnant liquid condition were concerned. Ranges of liquid Reynolds number and gas flow rate were 657–3 328 and 0.079–0.2 m3/h, respectively. Rolling period and amplitude range from 8 s to 16 s and from 5° to 15°, respectively. Fluctuation amplitudes of transient parameters such as flow rate, pressure drop, void fraction and gas rising velocity were focused on this study. The results indicate that flow rate and frictional pressure drop present obvious fluctuations after rolling motion, and the fluctuation amplitudes decrease with the decrease of bypass valve opening. Flow rate reaches to peak at the positive rolling amplitude and it reaches to trough at the negative rolling amplitude, and there is no obvious phase difference between the fluctuation and rolling angle. Periodical fluctuation of gas flow rate was weakened with the increase of gas inlet pressure and valve opening under experimental conditions, while the variations of void fraction and gas rising velocity were limited. Transient parameter fluctuations correspond to the rolling period at low gas flow rate, whereas their periodical fluctuations are inconspicuous in relative high gas flow rate. Amplitudes of void fraction and gas rising velocity increase with increasing the rolling amplitude while the amplitudes of void fraction and gas rising velocity are nearly invariable with the rolling period no matter if gas flow rate oscillates.
Kurzfassung
Experimentelle Untersuchungen zu adiabaten transienten Strömungsschwankungen in einem 3 × 3-Stabbündel, das bei Normaldruck und -temperatur einer Rollbewegung ausgesetzt ist, wurden durchgeführt. Dabei handelte es sich sowohl um eine einphasige Strömung als auch um Gasparameter bei stagnierendem Flüssigkeitszustand. Die Bereiche der Flüssigkeits-Reynoldszahl und des Gasdurchsatzes lagen bei 657–3 328 bzw. 0,079–0,2 m3/h. Rollperiode und Amplitudenbereich von 8 s bis 16 s bzw. von 5° bis 15°. Schwankungsamplituden der transienten Parameter Durchfluss, Druckverlust, Hohlraumanteil und Gasanstiegsgeschwindigkeit wurden in dieser Studie untersucht. Die Ergebnisse deuten darauf hin, dass Durchflussmenge und Reibungsdruckabfall nach der Umwälzbewegung deutliche Schwankungen aufweisen und die Schwankungsamplituden mit abnehmender Öffnung des Bypass-Ventils abnehmen. Die Durchflussmenge erreicht ihren Höhepunkt bei der positiven Rollamplitude und ihren Tiefpunkt bei der negativen Rollamplitude, und es gibt keine offensichtliche Phasendifferenz zwischen Fluktuation und Rollwinkel. Die periodischen Schwankungen des Gasdurchsatzes wurden durch die Erhöhung des Gaseinlassdrucks und der Ventilöffnung unter experimentellen Bedingungen abgeschwächt, während die Schwankungen des Hohlraumanteils und der Gasanstiegsgeschwindigkeit begrenzt waren. Transiente Parameterschwankungen entsprechen der Rollperiode bei geringem Gasdurchsatz, während ihre periodischen Schwankungen bei relativ hohem Gasdurchsatz unauffällig sind. Die Amplituden des Hohlraumanteils und der Gasanstiegsgeschwindigkeit nehmen mit zunehmender Rollamplitude zu, während die Amplituden des Hohlraumanteils und der Gasanstiegsgeschwindigkeit mit der Rollperiode nahezu unveränderlich sind, unabhängig davon, ob der Gasdurchsatz schwankt.
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© 2019, Carl Hanser Verlag, München
Articles in the same Issue
- Contents/Inhalt
- Contents
- Technical Contributions/Fachbeiträge
- Revision of a CHF correlation for PWR under low pressure conditions with only dimensionless parameters as independent variables
- Experimental study on transient flow fluctuation characteristics in a 3 × 3 rod bundle under rolling condition
- The core shroud leakage analysis and study for Kuosheng nuclear power plant
- Coupling simulation of neutron kinetics core model with CFD of IPWR steam line break accident
- Numerical prediction of single-phase flow mixing characteristics in a 1/12th of the cross segment of a 54-rod bundle
- 10.3139/124.110984
- Control rod material effect on safety parameters of research reactors
Articles in the same Issue
- Contents/Inhalt
- Contents
- Technical Contributions/Fachbeiträge
- Revision of a CHF correlation for PWR under low pressure conditions with only dimensionless parameters as independent variables
- Experimental study on transient flow fluctuation characteristics in a 3 × 3 rod bundle under rolling condition
- The core shroud leakage analysis and study for Kuosheng nuclear power plant
- Coupling simulation of neutron kinetics core model with CFD of IPWR steam line break accident
- Numerical prediction of single-phase flow mixing characteristics in a 1/12th of the cross segment of a 54-rod bundle
- 10.3139/124.110984
- Control rod material effect on safety parameters of research reactors
