Flow measurement at the short structures in hydraulic complex conditions: HE Djerdap 2 [Serbia, Romania] case study | Merenje protoka na kratkim objektima u hidraulički neregularnim uslovima na primeru HE Đerdap 2 [Srbija, Rumunija]
2011
Prodanović, D., Građevinski fakultet, Beograd (Serbia) | Pavlović, D., Građevinski fakultet, Beograd (Serbia) | Branisavljević, N., Građevinski fakultet, Beograd (Serbia)
Hydraulic conditions at short structures in most cases prevents the existance of cross sections with parallel streamlines and fully developed turbulent flow profile. In such conditions the flow measurement is rather challenging. In spite of recent developments in flow measuring methods, there is no universal device that can be used in inappropriate hydraulic conditions with adequate accuracy. This paper gives the overview of the contemporary flow measuring methods with the focus on its usability in hydraulically difficult conditions. As a case study, the problem of flow measurements at the intake of the aggregates of Hydroelectric Power Plant (HE) Djerdap 2 is presented. Due to its position in Danube and leftovers of preconstruction works in river bed, there is a significant incoming angle of the water to the HE Djerdap turbines. The streamlines angle is larger at the Serbian side then at the Romanian side, resulting the worse efficiency of the Serbian turbines. To analyze the effect of the curved incoming stream to the turbine performance, the true flowrate has to be measured. Since the Kaplan’s short turbines were used and no regular cross section where flow can be measured using standard methods exists, available measuring methods for velocity field measurement were analyzed in this paper. For selected method based on electromagnetic velocity measurement devices, the field check was performed and presented. The paper concludes with the assessment of accuracy and total costs for selected flow measurement method.
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