Abstract
Through numerical simulations, this work analyzes the unsteady pressure pulsation characteristics in new type of dishwasher pump with double tongue volute and single tongue volute, under volute static and rotation conditions. Likewise, the performance tests were also carried out to verify the numerical results. Multiple monitoring points were set at the various positions of new type dishwasher pump to collect the pressure pulsation signals, and the relevant frequency signals were obtained via Fast Fourier Transform, to analyze the influence of volute tongue and its passive speed on the pump performance. The results reveal that when the double tongue volute is stationary, the pressure pulsation amplitudes increase from the impeller inlet to the impeller outlet. Under the influence of shedding vortex, the pressure pulsation in the lateral region of tongue becomes disorganized, and the main frequency of pressure pulsation changes from blade frequency to shaft frequency. In addition, compared with the static volute, double tongue volute can effectively guide the water flow out of the tongue during the rotation process, thus ensuring good periodicity for pressure pulsation in the tongue region. Accordingly, a volute reference scheme with passive rotation speed is proposed in this study, which can effectively improve the pressure pulsation at tongue position, and provides a new idea for rotor-stator interference to guide the innovation of dishwasher.
Highlights
Using a combination of volute and spray arm, new dishwasher pump realizes open cleaning without the pipeline, thereby indicating the following advantages: no pipeline dirt, short cleaning time, and labor and water saving
Yang et al [5] analyzed the pressure pulsation characteristics in a three-stage electrical submersible pump by experiments and numerical simulations. is research showed that the rotor-static interference between the impeller and the guide vane was a direct cause of pulsation
The accuracy of simulations is verified via experiments, and the pressure pulsation characteristics in the dishwasher pump with double tongue volute are studied by numerical calculation method
Summary
Using a combination of volute and spray arm, new dishwasher pump realizes open cleaning without the pipeline, thereby indicating the following advantages: no pipeline dirt, short cleaning time, and labor and water saving. Zhang et al [6] experimentally investigated the influence of different blade cutting angles on the pressure pulsation of centrifugal pump and. Feng et al [8] studied the influence of tip clearance on pressure pulsations in an axial flow water pump via numerical simulations. Chalghoum et al [17] studied the influence of different volute shapes on pressure pulsation in the centrifugal pumps. Shim et al [18] carried out a multiobjective optimization for double volute centrifugal pump with diaphragm, where the pressure pulsation for the optimized model was reduced, significantly. Only a few research studies discuss the pressure pulsation caused by the interaction between special double tongue volute (formed by 180° array of a single tongue volute) and compound impeller (combined with axial flow blade and centrifugal blade). Most of the research on pressure pulsation in the pump is based on the static condition of volute, while the literature on pressure pulsation under the rotating condition of volute is scarce, which initiates an urge to carry out required relevant research
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