3D CFD Simulation of Phase Resonance in a Pump Turbine with an Acoustic Model

Yujian Fang, Ping Huang, Shibing Jin, Demin Liu, Jinfeng Zhang and Shouqi Yuan
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Yujian Fang: Department of Mechanical and Power Engineering, Jingjiang College, Jiangsu University, Zhenjiang 212028, China
Ping Huang: National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China
Shibing Jin: National Quality Inspection Center for Pump Products (Zhejiang), Wenling 317599, China
Demin Liu: Dongfang Electric Machinery Co., Ltd., Deyang 618000, China
Jinfeng Zhang: National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China
Shouqi Yuan: National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China

Energies, 2021, vol. 14, issue 22, 1-14

Abstract: In order to understand the complex nature of the system dynamic phenomena, such as the strong vibration and noise caused by blade passage in the pump turbine, a state-of-the-art three-dimensional (3D) compressible transient simulation would be desirable to study the problem in depth. This study investigated the phase resonance (PR) that occurred during a full-load operation in the turbine mode of a pump turbine on a prototype scale. As a first step, the wave reflection at the boundaries, and the influence of the timestep and sound speeds on the behavior of traveling pressure waves inside a spiral casing, were studied. It was found that nonreflective boundary conditions and an appropriately small timestep are critical to capturing the wave reflection and superposition process inside a spiral casing; a certain kind of direct PR risk was detected in its system design. The detected direct PR differed from the well-known PR with two features: firstly, it was almost independent of the sound speeds, and secondly, the pressure distribution over the spiral circumference varied among the amplitudes. The latter feature was caused by pressure waves at every stator channel induced by a rotor stator interaction (RSI). The 3D flow simulation with an acoustic model, which couples the RSI and PR phenomena, would predict better results for understanding the problem than the simplified one-dimensional (1D) method.

Keywords: phase resonance; CFD simulation; compressible flow; pump turbine; wave propagation; full load (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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