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ABSTRACT
Recently, researches on pump as turbine (PAT) have been one of the hot issues in fluid machineries. Of these hydraulic turbines, multi-stage PATs are widely used in industrial fields. However, most attentions have been paid on performance of the single-stage PATs and the turbines themselves. In this paper, a potential multi-stage PAT system with load pump was investigated numerically and experimentally. The match relations between PAT and load pump were explored by theory, and an analytical method to predict performance of PAT system was proposed in addition. Computational fluid dynamics method (CFD) was adopted to study the performance characteristics of PAT under a constant rotation or certain head. The operational rules of multi-stage PAT system were analyzed in both constant and variable speed that confirmed the prediction of system performance. The results could give guidance to choose a proper load pump and promote efficiency of PAT system.
Funding
This work was supported by the National Natural Science Foundation of China (Grant No. 51536008, Grant No. 51576179), Zhejiang Provincial Natural Science Foundation of China (Grant No. LZ15E090002), the Open Research Subject of Key Laboratory of Fluid and Power Machinery for Ministry of Education (Grant No. szjj2017-101).