تحليل رفتار پمپ و ارايه بهترين نقطه كاركرد آن در حالت چرخش به عنوان توربين

Analyzing and Prediction of the Best Performance Point of Pump Rotating as Turbine

Operating of pump as turbine could be considered with two point of view: first in transient operation when flow to be reversed and second in steady operation that pump is used instead of turbine. Although very efforts have been done for obtaining of relations of pump as turbine operation but few efforts have been done according to flow analyzing and losses behaviour. In the first phase of this presented paper, with considering of pump as turbine behaviour in steady operating, the hydraulic losses of volute and impeller according to the experimental results and theoretical relations have been obtained and in the next section, the new method for prediction of the best operating point has been presented. Because . of complexity of pump as turbine behaviour, the prediction of performance of pump as turbine is difficult. The existed relations. that predicate the pump as turbine behaviour is pending of empiric. So the very interests exist for obtaining of theoretical relations. In the present paper, the performance point of pump as turbine is determined with calculation of hydraulic parameters and then the best performance point of pump as turbine is presented. Finally the obtained results are compared with experimental results.