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Pressure fluctuation characteristics in the pressurization unit of a multiphase pump

Journal of Hydrodynamics 2021年第6期33卷 1230-1241页

作者： Guang-tai Shi Zong-ku Liu Ye-xiang Xiao Xue-lin Tang Xiao-bing Liu Key Laboratory of Fluid and Power Machinery Ministry of EducationXihua UniversityChengdu 610039China College of Water Resources and Civil Engineering China Agricultural UniversityBeijing 100083China State Key Laboratory of Hydroscience and Engineering and Department of Energy and Power Engineering Tsinghua UniversityBeijing 100084China Beijing Engineering Research Centre of Safety and Energy Saving Technology for Water Supply Network System China Agricultural UniversityBeijing 100083China

The tip clearance induces the tip leakage vortex(TLV),which has a great impact on the pressure fluctuation characteristics of the multiphase *** investigate the effect of the tip clearance on the pressure fluctuations,based on the Reynolds time-averaged Navier-Stokes equation and the shear stress transfer(SST)k-ωturbulence model,the three-dimensional turbulent flow in the pump is numerically simulated for different tip clearances in the water and gas-liquid two-phase cases by using the ANSYS CFX software and the results are verified with experimental *** is shown the greater pressure fluctuation intensity corresponds with the TLV both in the water and gas-liquid two-phase *** the meantime,the location of the maximum pressure fluctuation intensity is related to the tip clearance *** addition,for different tip clearances,the pressure fluctuation intensity with the rotor and stator interaction(RSI)is relatively *** difference is that when R_(tc)=1.5 mm,the pressure fluctuation intensity near the impeller middle point is also relatively *** the whole,the pressure fluctuation intensity in the gas-liquid two-phase case is larger than that in the water ***,the gas causes the frequency of the high-amplitude pressure fluctuation in the impeller and the diffuser to be shifted from 7 f_(n)(f_(n) denotes impeller rotational frequency)and 3 f_(n) to the low-frequency region,*** pressure fluctuations at the blade-passing frequency(BPF)and the multiple BPFs gradually ***,the amplitude at the dominant frequency in the gas-liquid two-phase case is at least one order of magnitude smaller than that in the water case,and the peak-to-peak value of the pressure fluctuation is also much smaller.

关键词： Multiphase pump gas void faction pressure fluctuation intensity tip leakage vortex(TLV) numerical simulation

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