Abstract
This study experimentally and numerically investigates the unsteady flow in a centrifugal pump with special slope volute under various conditions to illustrate the detailed flow structures and pressure pulsation within the model pump. Whole flow passage is considered during the numerical simulation; pressure pulsation signals are extracted using nine fast-response pressure transducers. The Root mean square (RMS) method is introduced to deal with the discrete components at fBPF of the different monitoring points along the volute casing, which is an effective attempt to evaluate the overall pulsating level of the model pump. Results show that numerical method can predict the components at fBPF effectively; however, it has limited ability in capturing noise frequencies motivated by unsteady separate flow and non-linear interaction effect. Around the nominal flow rate, the predicted amplitudes at fBPF agree well with the experimental results, showing larger difference at the off-design conditions. To predict the pulsating level of the components at fBPF, two fitted equations of the RMS values versus the flow rate and specific speed are carried out, which would be very helpful in evaluating the pressure pulsation level in the centrifugal pump.
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Ning Zhang is currently studying for his Ph.D. at the School of Energy and Power Engineering, Jiangsu University, China. He received his Master’s degree in 2014 from Jiangsu University. He majors in unsteady flow phenomena in fluid machineries, especially in pumps, including rotor-stator interaction (FSI), flow induced vibration (FIV), and vortex induced vibration (VIV).
Minguan Yang was born in 1952. Currently, he is a professor and a Ph.D. candidate supervisor at the School of Energy and Power Engineering, Jiangsu University. His major research fields focus on multiphase flow within pumps and optimal design of fluid machineries.
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Zhang, N., Yang, M., Gao, B. et al. Experimental and numerical analysis of unsteady pressure pulsation in a centrifugal pump with slope volute. J Mech Sci Technol 29, 4231–4238 (2015). https://doi.org/10.1007/s12206-015-0919-y
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DOI: https://doi.org/10.1007/s12206-015-0919-y