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Title:NUMERIČNA IN EKSPERIMENTALNA NAPOVED HIDRAVLIČNEGA NAVORA NA ČEP VODILNE LOPATICE REVERZIBILNE ČRPALKE-TURBINE V ČRPALNEM REŽIMU
Authors:ID Ocepek, Matic (Author)
ID Lipej, Andrej (Mentor) More about this mentor... New window
Files:.pdf 1140$$doktorska_disertacija_ocepek_matic_nq_pdfa.pdf (24,51 MB)
MD5: CFBFD99549E309A22C84EBEA37908FFB
 
Language:Slovenian
Work type:Doctoral dissertation
Organization:UNM FS - University of Novo mesto - Faculty of Mechanical engineering
Abstract:Računalniška dinamika tekočin (CFD) ima vedno pomembnejšo vlogo pri napovedovanju značilnosti vseh vrst hidravličnih turbinskih strojev. Relativne rezultate karakterističnih krivulj za različne hidravlične oblike je mogoče napovedati zelo točno. Nasprotno je napovedovanje absolutnih vrednosti različnih karakteristik še vedno izziv. V doktorski disertaciji je predstavljena primerjava rezultatov modelnega preizkusa in numerične analize za glavne karakteristike reverzibilne črpalke-turbine v črpalnem in turbinskem režimu: padec/dobavna višina, hidravlični navor na gredi, pretok in izkoristek ter natančna analiza napovedi navora na čepe vodilnih lopatic za različne režime delovanja. Podrobne meritve modela reverzibilne črpalke-turbine so bile opravljene v hidravličnem laboratoriju v skladu z mednarodnim standardom IEC 60193. Posebna pozornost je bila namenjena meritvam navora na čep vodilne lopatice. Rezultati raziskave vključujejo primerjave glavnih karakteristik, ki izhajajo iz meritev in numeričnih analiz v različnih režimih delovanja reverzibilne črpalke-turbine. Brezdimenzijske vrednosti navorov na čepe vodilnih lopatic so primerjane in predstavljene v obliki diagramov. Primerjava kaže dobro ujemanje med rezultati preizkusa modela in analize CFD. Medtem ko je stacionarna analiza CFD dovolj točna za turbinski režim, nestacionarni izračuni zagotavljajo točnejše rezultate za delovanje v črpalnem režimu. Številne nestacionarne analize CFD kažejo, da je CFD enakovreden ali boljši od modelnega preizkusa v smislu hitrosti, stroškov in točnosti. Rezultati raziskave potrjujejo, da je uporaba analize CFD za napovedovanje navora na čepe vodilnih lopatic v energetskih hidravličnih strojih najbolj razumen pristop, ki odpravlja potrebo po dragih in zapletenih modelnih preizkusih.
Keywords:modelni preizkus v hidravličnem laboratoriju, reverzibilna črpalka-turbina, CFD, računalniška dinamika tekočin, nestacionarna CFD analiza, karakteristične krivulje
Year of publishing:2025
PID:20.500.12556/ReVIS-11917 New window
Publication date in ReVIS:05.07.2025
Views:38
Downloads:0
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Secondary language

Language:English
Title:NUMERICAL AND EXPERIMENTAL ANALYSIS OF GUIDE VANE PIVOT TORQUE PREDICTION IN THE REVERSIBLE PUMP-TURBINE
Abstract:Computational Fluid Dynamics (CFD) has been playing an important role in the prediction of different characteristics of all types of hydraulic turbomachinery. Relative results of the characteristics curves for different hydraulic shapes can be predicted very accurately. On the contrary the prediction of the absolute values of various characteristics is still a challenge. In the dissertation the comparison is presented between the results of the model testing and numerical analysis of the main reversible pump-turbine characteristics in pump and turbine mode: head, torque, efficiency and detailed analysis of prediction of the guide vane pivot torque for various operating regimes. Thorough model reversible pump-turbine measurements were done in hydraulic laboratory according to the international standard IEC 60193. Special attention was paid to the measurements of the guide vane torque. The research results include efficiency and QH curves derived from model test and numerical analyses across various operating regimes. Dimensionless guide vane pivot torque values from both model test and numerical analysis are compared and presented in the diagram form. The comparison shows good agreement between the model test and CFD results. While steady-state CFD is generally accurate enough for turbine mode operation, unsteady calculations provide more accurate results for pump mode operation. Numerous unsteady CFD analyses in turbine and pump mode operation demonstrate that CFD is equivalent or superior to the model test in terms of speed, cost and accuracy. This research establishes that using CFD to predict guide vane pivot torque in hydraulic turbomachinery is now the most reasonable approach, eliminating the need for model tests.
Keywords:model measurements in the hydraulic laboratory, reversible pump-turbine, CFD, Computational Fluid Dynamics, time-dependent (unsteady) CFD analysis, characteristic curves


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