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علوم تجربی حرارتی و سیالات 2011
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  • internal hydraulic analysis of impeller rounding in centrifugal pumps as turbines

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1224
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
      the use of pumps as turbines in different applications has been gaining importance in the recent years, but the subject of hydraulic optimization still remains an open research problem. one of these optimization techniques that include rounding of the sharp edges at the impeller periphery (or turbine inlet) has shown tendencies of performance enhancement. in order to understand the effect of this hydraulic optimization, the paper introduces an analytical model in the pump as turbine control volume and brings out the functionalities of the internal variables classified under control variables consisting of the system loss coefficient and exit relative flow direction and under dependent variables consisting of net tangential flow velocity, net head and efficiency. the paper studies the effects of impeller rounding on a combination of radial flow and mixed flow pumps as turbines using experimental data. the impeller rounding is seen to have positive impact on the overall efficiency in different operating regions with an improvement in the range of 1–3%. the behaviour of the two control variables have been elaborately studied in which it is found that the system loss coefficient has reduced drastically due to rounding effects, while the extent of changes to the exit relative flow direction seems to be limited in comparison. the reasons for changes to these control variables have been physically interpreted and attributed to the behaviour of the wake zone at the turbine inlet and circulation within the impeller control volume. the larger picture of impeller rounding has been discussed in comparison with performance prediction models in pumps as turbines. the possible limitations of the analytical model as well as the test setup are also presented. the paper concludes that the impeller rounding technique is very important for performance optimization and recommends its application on all pump as turbine projects. it also recommends the standardization of the rounding effects over wide range of pump shapes including axial pumps.

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