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V okviru zaključne naloge smo obravnavali delovanje centrifugalnih vodnih črpalk v okviru laboratorijske merilne postaje na Fakulteti za strojništvo, ki omogoča analizo delovanja črpalk v različnih režimih delovanja. Glavni cilj je bil obnoviti in nadgraditi merilno postajo ter vzpostaviti merilni sistem za zajem obratovalnih veličin in analizo karakteristik. Prvi del naloge je bil zato usmerjen v analizo trenutnega stanja. Glede na dotrajanost določenih delov merilne postaje smo izvedli zamenjavo regulacijskega ventila in nadgradili sistem za zajem in obdelavo izmerjenih veličin. V programskem okolju LabView smo vzpostavili okolje za zajem in obdelavo podatkov ter analizo karakteristik črpalk in cevovoda. V drugem delu naloge smo izvedli preizkuse ob različnih vezavah ene in/ali dveh centrifugalnih črpalk. Na podlagi meritev smo izračunali volumski pretok, dobavno višino, izkoristek in teoretično moč. Izrisali smo graf odvisnosti dobavne višine od pretoka, kar predstavlja osnovno karakteristiko centrifugalne črpalke. Na podlagi izmerjene potrebne električne moči smo dodatno, v vseh obratovalnih točkah izračunali energijski izkoristek centrifugalnih črpalk. Na podlagi dobljenih rezultatov lahko zaključimo, da je bila nadgradnja merilne postaje uspešna, saj nadgrajeni merilni sistem deluje pravilno, rezultati pa so v okviru pričakovanih vrednosti. The final thesis looked at the performance of centrifugal water pumps in the context of a laboratory metering station, which allows the analysis of the performance of pumps in different operating regimes. The main objective was to refurbish and upgrade the measurement station and to set up a measurement system for the acquisition of operating quantities and the analysis of the characteristics. The first part of the task focused on the analysis of the current situation. The control valve was replaced and the system for the acquisition and processing of measured values was upgraded. In the LabView software environment, we set up an environment for data acquisition and processing, as well as for the analysis of the pump and pipeline characteristics. In the second part of the task, tests were carried out with different couplings of one and/or two centrifugal pumps. Based on the measurements, we calculated the volumetric flow rate, delivery height, efficiency, and the theoretical power. We have plotted a graph of the dependence of the delivery head on the volumetric flow, which represents the basic characteristic of a centrifugal pump. Additionally, the energy efficiency of the centrifugal pumps has been calculated at all operating points based on the measured electrical power required. Based on the results, it can be concluded that the upgrade of the metering station has been successful, as the upgraded metering system is working correctly, and the results are within the expected values. |
