Fluid-solid Coupling Analysis And Erosion Wear Of Flow Field In Turbine Cascade

Nowadays,countries all over the world are constantly pursuing the development of new energy sources for sustainable use.However,oil and gas resources are still one of the main sources of energy needed today.Therefore,research on oil and gas layer exploitation is still one of the research priorities of researchers.New drilling technology and advanced drilling tools are the future development trend.As one of the oil well drilling tools,turbo drilling tools have been widely used in drilling sites because of their unique characteristics of high speed and high temperature resistance..The turbo drill converts the pressure energy of the fluid into the rotational mechanical energy of the output shaft through the blade.From the working principle,it is not difficult to find out whether the performance of the turbine drill depends largely on the performance of the turbine blade.To study the effect of solids under the action of flow field and the influence of solid changes on the flow field and its interaction(fluid-solid coupling analysis),the movement law and wear mechanism of solid-phase particles in the solid-liquid two-phase flow of turbo drills It has important engineering significance for detailed research.In this paper,the turbine drill cascade is taken as the main research object.The computational fluid dynamics,theoretical analysis and numerical simulation are used to analyze the flow field and blade structure in the turbine cascade.The specific research contents are as follows:(1)Taking the ?175 turbo drill as an example,combining the structural size parameters and performance parameters of the turbo drill to construct the blade profile expression,and establishing the solid model of the turbine cascade and runner through the 3D software,using CFD(CFX)simulation The flow field flow in the turbine cascade under the clear water medium is solved,and the velocity field and pressure field distribution of the turbine are obtained.The effectiveness of the fluid simulation is verified by the turbine bench test.(2)Based on the principle of fluid-solid coupling,based on the numerical simulation analysis and experimental verification of the flow field in the turbine cascade,the results of the flow field analysis are transmitted as a load to the solid by means of the Ansys Workbench co-simulation platform using a one-way coupling method.Structure,ignoring the influence of structural analysis results on the flow field,structural static analysis and modal analysis of turbine cascade blades,the stress strain and deformation law of turbine blade system and the natural frequency of the first six modes of turbine blades,the maximum amplitude and the corresponding mode shape.(3)Through the fluid simulation Fluent software,the shear stress transport k-?turbulence model and the particle orbit model are used to establish a prediction method for the erosion wear of turbine blades under the condition of solid-liquid two-phase flow.The distribution of blade erosion wear and the causes of the analysis were obtained by this method,and the influence factors such as particle density,particle diameter,particle mass flow rate,liquidus inlet velocity and turbine speed were analyzed under different conditions.The influence of erosion wear law provides a theoretical basis for turbine blade design,erosion detection and prevention.