Hydraulic Optimization of Two-Way Counter-rotating Axial Flow Pump Turbine

Wang Xiuli,Long Yun,Zhu Rongsheng,Li Yang,Lin Bin,Zhang Yan,Fu Qiang

doi:10.3389/fenrg.2020.577232

Wang Xiuli, Long Yun + Show 5 more

Open Access

https://doi.org/10.3389/fenrg.2020.577232

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Abstract

The two-way counter-rotation technology is mainly applied to the tidal power station. In this paper, the hydrodynamic optimization of the two-way counter-rotating axial-flow pump turbine is carried out. Under the premise of realizing the forward and reverse power generation and the forward and negative pumping basic function, it has important engineering significance and academic value for improving the pump turbine performance of various working conditions. The main contents are as follows: hydraulic design of “S”-shaped blade for the two-way counter-rotating axial-flow pump turbine is conducted, and the influence of the gap between different impeller stages on the performance is calculated and analyzed, and the variation law of head and efficiency of the pump turbine under different inter-stage clearances is obtained. And the influence of the inter-stage gap on the unit is summarized from the vorticity distribution and the axial section pressure cloud diagram analysis, and the range of the best inter-stage gap of the unit performance is determined.

Highlights

At present, fossil fuels still account for the vast majority of global energy demand, and their mining progress and environmental degradation have far exceeded imagination
Similar to ordinary hydropower generation, tidal power generation is that during high tide, seawater is stored in reservoirs as potential energy, and the seawater is released during the ebb tide
The other part of the fluid is directly impacted on the working surface of the secondary impeller, causing a large number of vortices to accumulate at the secondary impeller, and the overall pressure in the secondary impeller is lower than other clearance conditions

Summary

Introduction

Fossil fuels still account for the vast majority of global energy demand, and their mining progress and environmental degradation have far exceeded imagination. Similar to ordinary hydropower generation, tidal power generation is that during high tide, seawater is stored in reservoirs as potential energy, and the seawater is released during the ebb tide. The bulb cross-flow type’s pumping conditions and power generation conditions can obtain excellent performance due to the straightness of the inlet and outlet water channels. Applying it to the tidal power station can realize six functions of two-way power generation, two-way pumping and two-way water drain, and it is very suitable for the development and utilization of tidal resources (Zhu, 2018; Gao et al, 2019; Yang, 2019)

Methods

Findings

Discussion

Conclusion