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Axial Flow Pump

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Desheng Zhang – One of the best experts on this subject based on the ideXlab platform.

  • a study on tip leakage vortex dynamics and cavitation in Axial Flow Pump
    Fluid Dynamics Research, 2017
    Co-Authors: Lei Shi, Desheng Zhang, Weidong Shi, Yongxin Jin, B P M Van Esch

    Abstract:

    The tip leakage Flows and related cavitation in the tip region of an AxialFlow Pump were investigated in detail using the numerical and experimental methods. The numerical results of the Pump model performance were in good agreement with experimental data. The Flow structures in the tip clearance were clarified clearly with detailed data involving the Axial velocity and turbulent kinetic energy. When depicting the feature of vortex core, the advanced vortex identification method λ 2-criterion was used. Simultaneously, the minimum tension criterion was also applied to predict the cavitation inception for different Flow rates and it is consistent with the distributions of vorticity and pressure in the vortex core. The roll-up process of TLV is highly three-dimensional and the entrainment would follow different paths. Then, both the numerical and experimental approaches show the cavitation patterns for different cavitation conditions, and it also finds that slight cavitation would promote the development of tip leakage vortex (TLV) while the TLV seems to be eliminated for a low cavitation number, especially before a specific location of blade tip due to the blade loading change induced by cavitation possibly.

  • Numerical simulation and optimization of solid-liquid two-phase Flow in a back-swept AxialFlow Pump
    Thermal Science, 2017
    Co-Authors: Desheng Zhang, Weidong Shi, Qiang Pan, Rui-jie Zhang, Xing Jin

    Abstract:

    The simulation study is proposed to analyze the wear property of the Axial Flow Pump using the sewage as medium. Different Axial Flow Pumps are designed with different back-swept angles, of which are 40?, 65?, and 90?. Numerical simulation results showed the relationship between solid volume fraction and back-swept angle on the pressure/suction surface, as well as the particle diameter. To validate the correctness of numerical investigation, the result of the 65? backswept blade model was compared with a sludge Axial Flow Pump in sewage treatment plant, which showed fair agreement with the simulated results.

  • numerical and experimental investigation of tip leakage vortex trajectory and dynamics in an Axial Flow Pump
    Computers & Fluids, 2015
    Co-Authors: Desheng Zhang, Weidong Shi, B P M Van Esch, Lei Shi, Michel Dubuisson

    Abstract:

    Abstract Tip leakage vortex (TLV) in an Axial Flow Pump was simulated by using the shear-stress transport (SST) k – ω turbulence model with a refined high-quality structured grid at different Flow rate conditions. The TLV trajectories were obtained by using the swirling strength method corresponding to the cross-sections of streamlines of the TLV. High-speed photography experiments were conducted to observe the TLV trajectory based on cavitation tracing bubbles in an Axial Flow Pump with a transparent casing. The TLV trajectories predicted by the SST k – ω turbulence model agreed well with the visualization results. The numerical and experimental results show that the starting point of the TLV is near the leading edge at part-load Flow rate condition ( Q / Q BEP = 0.85 ), and it moves towards the trailing edge to approximately 20% blade chord at the design Flow rate condition ( Q / Q BEP = 1.0 ). At large Flow rate conditions ( Q / Q BEP = 1.2 ), the starting point of the TLV shifts to about 40% blade chord, and the relative angle between the TLV trajectory and the blade chord is gradually reduced with the increased Flow rate. Detailed statistics of the fluid dynamics of the end-wall shear layer and the TLV at design and off-design conditions were discussed based on the numerical results. The shear layer and jetting Flow in the tip gap are highly affected by the pressure difference between the pressure side (PS) and suction side (SS). It was also found that the distributions of static pressure, turbulent kinetic energy (TKE) and vorticity inside the TLV core are associated with the TLV structure which is affected by blade loading and operation conditions of the Axial Flow Pump.

Zhang Qian – One of the best experts on this subject based on the ideXlab platform.

  • Distribution of unsteady pressure in volute type Axial Flow Pump
    Journal of Vibroengineering, 2018
    Co-Authors: Cao Weidong, Yao Lingjun, Zhang Qian

    Abstract:

    In order to study the distribution of unsteady pressure in volute type Axial Flow Pump, the k-e turbulence model was applied, and ANSYS CFX was provided for numerical simulation calculation. Experiments of external characteristics and pressure fluctuation have been done to verify the results of numerical simulation. The results show that under the design operating condition, the main fluctuation frequencies in the volute, at the inlet and outlet of the impeller are the blade passing frequency. The amplitudes of fluctuation at the inlet of the impeller decrease gradually from the rim to the hub, while those at the export decrease firstly and then increase, the amplitudes at the tongue are much higher than that at other sections of the volute. Under the off-design operating conditions, the main fluctuation frequency at the inlet and outlet of the impeller is still the blade passing frequency, while that at the tongue is between the twice shaft frequency and the blade passing frequency, fluctuation amplitudes are both larger than those under the design operating condition. Under the design operating condition, the radial force on the impeller is the minimum, however, the Axial force increases with the increase of Flow rate. The distributions of unsteady pressure in volute type Axial Flow Pump are different with general centrifugal or Axial Flow Pump.

  • Distribution of unsteady pressure in volute type Axial Flow Pump
    'JVE International Ltd.', 2018
    Co-Authors: Cao Weidong, Yao Lingjun, Zhang Qian

    Abstract:

    In order to study the distribution of unsteady pressure in volute type Axial Flow Pump, the k-ε turbulence model was applied, and ANSYS CFX was provided for numerical simulation calculation. Experiments of external characteristics and pressure fluctuation have been done to verify the results of numerical simulation. The results show that under the design operating condition, the main fluctuation frequencies in the volute, at the inlet and outlet of the impeller are the blade passing frequency. The amplitudes of fluctuation at the inlet of the impeller decrease gradually from the rim to the hub, while those at the export decrease firstly and then increase, the amplitudes at the tongue are much higher than that at other sections of the volute. Under the off-design operating conditions, the main fluctuation frequency at the inlet and outlet of the impeller is still the blade passing frequency, while that at the tongue is between the twice shaft frequency and the blade passing frequency, fluctuation amplitudes are both larger than those under the design operating condition. Under the design operating condition, the radial force on the impeller is the minimum, however, the Axial force increases with the increase of Flow rate. The distributions of unsteady pressure in volute type Axial Flow Pump are different with general centrifugal or Axial Flow Pump

Weidong Shi – One of the best experts on this subject based on the ideXlab platform.

  • a study on tip leakage vortex dynamics and cavitation in Axial Flow Pump
    Fluid Dynamics Research, 2017
    Co-Authors: Lei Shi, Desheng Zhang, Weidong Shi, Yongxin Jin, B P M Van Esch

    Abstract:

    The tip leakage Flows and related cavitation in the tip region of an AxialFlow Pump were investigated in detail using the numerical and experimental methods. The numerical results of the Pump model performance were in good agreement with experimental data. The Flow structures in the tip clearance were clarified clearly with detailed data involving the Axial velocity and turbulent kinetic energy. When depicting the feature of vortex core, the advanced vortex identification method λ 2-criterion was used. Simultaneously, the minimum tension criterion was also applied to predict the cavitation inception for different Flow rates and it is consistent with the distributions of vorticity and pressure in the vortex core. The roll-up process of TLV is highly three-dimensional and the entrainment would follow different paths. Then, both the numerical and experimental approaches show the cavitation patterns for different cavitation conditions, and it also finds that slight cavitation would promote the development of tip leakage vortex (TLV) while the TLV seems to be eliminated for a low cavitation number, especially before a specific location of blade tip due to the blade loading change induced by cavitation possibly.

  • Numerical simulation and optimization of solid-liquid two-phase Flow in a back-swept AxialFlow Pump
    Thermal Science, 2017
    Co-Authors: Desheng Zhang, Weidong Shi, Qiang Pan, Rui-jie Zhang, Xing Jin

    Abstract:

    The simulation study is proposed to analyze the wear property of the Axial Flow Pump using the sewage as medium. Different Axial Flow Pumps are designed with different back-swept angles, of which are 40?, 65?, and 90?. Numerical simulation results showed the relationship between solid volume fraction and back-swept angle on the pressure/suction surface, as well as the particle diameter. To validate the correctness of numerical investigation, the result of the 65? backswept blade model was compared with a sludge Axial Flow Pump in sewage treatment plant, which showed fair agreement with the simulated results.

  • numerical and experimental investigation of tip leakage vortex trajectory and dynamics in an Axial Flow Pump
    Computers & Fluids, 2015
    Co-Authors: Desheng Zhang, Weidong Shi, B P M Van Esch, Lei Shi, Michel Dubuisson

    Abstract:

    Abstract Tip leakage vortex (TLV) in an Axial Flow Pump was simulated by using the shear-stress transport (SST) k – ω turbulence model with a refined high-quality structured grid at different Flow rate conditions. The TLV trajectories were obtained by using the swirling strength method corresponding to the cross-sections of streamlines of the TLV. High-speed photography experiments were conducted to observe the TLV trajectory based on cavitation tracing bubbles in an Axial Flow Pump with a transparent casing. The TLV trajectories predicted by the SST k – ω turbulence model agreed well with the visualization results. The numerical and experimental results show that the starting point of the TLV is near the leading edge at part-load Flow rate condition ( Q / Q BEP = 0.85 ), and it moves towards the trailing edge to approximately 20% blade chord at the design Flow rate condition ( Q / Q BEP = 1.0 ). At large Flow rate conditions ( Q / Q BEP = 1.2 ), the starting point of the TLV shifts to about 40% blade chord, and the relative angle between the TLV trajectory and the blade chord is gradually reduced with the increased Flow rate. Detailed statistics of the fluid dynamics of the end-wall shear layer and the TLV at design and off-design conditions were discussed based on the numerical results. The shear layer and jetting Flow in the tip gap are highly affected by the pressure difference between the pressure side (PS) and suction side (SS). It was also found that the distributions of static pressure, turbulent kinetic energy (TKE) and vorticity inside the TLV core are associated with the TLV structure which is affected by blade loading and operation conditions of the Axial Flow Pump.