Analysis On Abrasion And Energy Loss Characteristics Of Centrifugal Pump Blade In Solid-liquid Tow-phase Flow

Centrifugal pump has a wide range of applications in life and engineering applications such as agriculture,fishery industry,petrochemicals,hydropower plants,energy and power engineering,etc.While wear of the parts of solid-liquid two-phase centrifugal pump,energy loss and pump stability are the main bottleneck in these areas.In this paper,takeing a centrifugal pump with vane diffuser as the object of study and using the standard kappa turbulence model and Mixture multiphase flow model to carry out numerical simulation of solid-liquid two-phase medium in the whole flow passage.Under the condition of different particle size(0.016 mm,0.036 mm,0.076 mm,0.15mm)and different solid phase volume fraction(2%,4%,8%,12%),firstly,calculated the more serious wear parts then calculate the friction wear and the collision wear of these parts quantificationally.Secondly,figured out the relative energy rotor enthalpy(Rothalpy)of the fluid micelles to determine the energy change from the blade leading edge to the outlet.Finally,though LES study pressure fluctuation at each monitoring point in the flow passage.The results show that:1.In the blade pressure surface the relative velocity from the leading edge to the outlet of the blade is first decrease then increase.In the blade suction surface from the leading edge to the second half of the blade the relative velocity is first increase then decrease and in outlet is increase.The relative velocity is little change when the increase of particle size and volume fraction within limits.2.The most serious wear occurred in the blade suction surface inlet,followed by the blade leading edge and the outlet of the streamline of pressure surface and cover.The outlet of pressure surface and the suction surface the wear is also larg er.At the front and outlet of the streamline of pressure surface and front cover the wear is small.3.From the blade leading edge to the outlet of the blade the Rothalpy value is increased overall.At the same monitoring point,the energy on the pressure surface is larger than that the suction surface.The front half of the blade pressure surface fluid particles are gradually obtained energy along the radial direction of the impeller.The energy loss in the second half of the pressure surface increases gradually,the energy obtained at the outlet of the pressure surface decreases and the energy los s is greater.On the suction surface along the radial direction of the impeller,fluid continuously obtain energy and suction inlet fluid obtain the minimum energy,the suction surface outlet side that fluid obtained energy decreases at the outlet the larg er energy loss.4.With the increase of particle size,the amplitude of pressure fluctuation is decreased gradually.The pressure fluctuation waveforms of the solid-liquid two-phase medium are lagging behind the waveforms in the water medium.The solid phase volume fraction has little effect on pressure fluctuation.