Investigation of Unsteady Pressure Pulsation in New Type Dishwasher Pump with Special Double Tongue Volute

Zhang, Jinfeng; Zhu, Yilei; Li, Yalin; Huang, P. G.; Xu, Hui; Zheng, Feng

doi:10.1155/2022/9349432

Cited by 2 publications

(1 citation statement)

References 27 publications

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“…(1) Boundary conditions There was a dynamic and static interface between the guide vane and the runner and the runner and the draft tube. The multiple reference frame (MRF) model and sliding grid model were used to deal with the interface models [27]. In this paper, a multiple reference frame model was chosen to deal with the dynamic-static interface.…”

Section: Boundary Conditions and Calculation Methodsmentioning

confidence: 99%

Study on Flow Characteristics of Francis Turbine Based on Large-Eddy Simulation

Xu,

Cheng,

Lin

et al. 2023

Water

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The research object was a Francis turbine, and the working conditions at 100%, 75%, 50%, 25%, and 1% opening were determined by the opening size of the guide vane. Large-Eddy Simulation (LES) was adopted as a turbulence model method to conduct three-dimensional unsteady turbulent numerical simulation of the entire flow channel of a Francis turbine, and the flow situation of various parts of the turbine under different working conditions was obtained. The flow characteristics of each component under different working conditions were analyzed, and the hydraulic performance of each part was evaluated. The factors that affected the stability of hydraulic turbines were identified, and their formation mechanisms and evolution laws were explored. The results show that the guide vane placement angle was reasonable in the guide vane area, and the hydraulic performance was fine. The impact on the stability of the hydraulic turbine was small. Further research showed that the hydraulic performance was poor in the runner area, and there were flow separation and detachment phenomena in the flow field. This created a channel vortex in the runner blade channel. The channel vortex promoted the lateral flow of water and had a significant impact on the stability of the hydraulic turbine. The diffusion section of the draft tube can dissipate most of the kinetic energy of the water flow in the draft tube area, and it had a good energy dissipation effect. However, the was a large pressure difference between the upper and lower regions of the diffusion section, and it generated a backflow phenomenon. It created vortex structures in the draft tube, and the stability of the hydraulic turbine was greatly affected.

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Section: Boundary Conditions and Calculation Methodsmentioning

confidence: 99%

Study on Flow Characteristics of Francis Turbine Based on Large-Eddy Simulation

Xu,

Cheng,

Lin

et al. 2023

Water

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Orthogonal Optimization Design of the Compound Impeller for a New Type of Dishwasher Pump

Sun

et al. 2022

Processes

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A new type of dishwasher pump without a pipeline system was invented for the first time to form an original sink-type dishwasher avoiding the accumulation of dirt in the hydraulic system. In order to improve the hydraulic performance of this new type of dishwasher pump with twin-volute passive rotation driven by a compound impeller, an orthogonal optimal design method was first introduced to optimize the compound impeller composed of axial cascades and radial blades. Six geometric parameters were selected as the main factors to design the orthogonal table L18(36). All impeller models were manufactured via high-precision 3D printing and tested to determine the optimal solution. Firstly, the hydraulic performance was measured using a specially designed test bench under the assumption of static-volute conditions. Then, the optimization scheme was verified in real machine experiments under the rotating-volute condition, and numerical calculations were used to assess the performance improvement due to optimization under the static- and rotating-volute conditions. The results show that the main factors affecting the pump head and efficiency are impeller outlet diameter D2 and profile line L. The optimized pump head and efficiency are significantly higher than those of the original scheme. Furthermore, the entropy production of each flow passage component of this new type of dishwasher pump is significantly reduced after optimization. Under the static-volute condition, the scheme obtained using the range analysis displays an increase of 0.3 m in the pump head and 2.99% in pump efficiency. Under the rotating-volute condition, the optimization scheme is also effective (pump head increased by 0.54 m, and pump efficiency by 7.46%). At the same time, the passive rotation speed of the twin-volute increases from 60 rpm to 70 rpm, verifying that both the optimization method is reliable and can be used when developing and optimizing dishwasher pumps.

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Investigation of Unsteady Pressure Pulsation in New Type Dishwasher Pump with Special Double Tongue Volute

Cited by 2 publications

References 27 publications

Study on Flow Characteristics of Francis Turbine Based on Large-Eddy Simulation

Study on Flow Characteristics of Francis Turbine Based on Large-Eddy Simulation

Orthogonal Optimization Design of the Compound Impeller for a New Type of Dishwasher Pump

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