| Labyrinth screw pump is a kind of low flow and high hydraulic lift fluid machinery, it is widely used in many production and living fields, ranging from petrochemical processing, agriculture irrigation, sewage disposal, etc, it can be for single-phase, gas-liquid or solid-liquid two-phase and gas-liquid-solid three-phase fluid transportation, the current research on multiphase flow and the structure characteristics of pump is less, systematic research of multi-conditions and multi-medium numerical simulation and structure characteristic was taken in this article. The main contents are as following:(1) Numerical calculation of pump was processed by employing the RNG κ-ε,SST k-ω, standard k-ε, standard k-ω turbulence models, and then compared with the experimental data, analysis and discusses the influences of different turbulence models on the hydraulic performance prediction and flow field of the labyrinth screw pump.(2) The flow field of solid-liquid two-phase in the pump under the condition of different initial concentrations and diameters was simulated by FLUENT analysis software. Intuitive understanding of the flow characteristics, including the pressure, velocity, the effects of the initial concentration and diameter of solid particles to the pump lift and efficiency of the pump are analyzed; the flow field of gas-liquid two-phase in the pump under different gas rate was simulated by CFD, the pressure, the velocity, the distribution of gas and liquid phase in the pump was investigated, and a gas-liquid two phase flow experiment was carried out, analysis of the hydraulic performance and the diameter of the bubbles and distribution of pump, to explore the oxygenation capacity and the mechanism of micro-nano bubbles of pump.(3) Numerical simulation were involved in studying the gas-liquid-solid flow media in the labyrinth screw pump. Analysis of the flow characteristics, including the pressure, the velocity and the distribution of gas-liquid-solid three phase, and explore the volume fraction contour of solid and gas phase in rotor, comparison and analysis of the pump hydraulic properties in single-phase flow, two-phase flow and three-phase, system studied the distribution regularity of flow field and the hydraulic performance of pump in gas-liquid-solid three phase.(4) Analysis of the labyrinth screw pump rotor statics and modality based on fluid-structure interaction theorem. Simulation calculation carried out on the rotor by the multi-physical fields simulation platform-ANSYS Workbench, the equivalent stress and deformation of rotor at different flow rate conditions and the former 6 ordered inherent frequencies and types of vibration of rotor were obtained, the characteristics of the largest equivalent stress and total deformation under different operation conditions were investigated. The research results are useful for the operational structure optimization of the labyrinth screw pump. |
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