项目来源

俄罗斯科学基金(RSF)

项目主持人

Kozhus Olga

项目受资助机构

Federal State Budgetary Educational Institution of Higher Education"Orel State University named after I.S.Turgenev"

项目编号

23-79-10245

立项年度

2023

立项时间

未公开

项目级别

国家级

研究期限

未知 / 未知

受资助金额

未知

学科

ENGINEERING SCIENCES-Theory,development methods and operational efficiency of technical systems

学科代码

09-09-601

基金类别

未公开

гидроабразивное резание ; машиностроение ; технологии ; абразив ; гидроабразивный станок ; режимы резания ; waterjet cutting ; mechanical engineering ; technology ; abrasive ; waterjet machine ; cutting modes

参与者

未公开

参与机构

未公开

项目标书摘要：nnotation:The project is aimed at solving the actual problem of cutting materials at previously inaccessible speeds by expanding the technological capabilities of the advanced production technology of waterjet cutting.Waterjet cutting is one of the most demanded technologies in the world.Especially important is the use for deep-water cutting,including in the Arctic.
        The problem of the proposed project is associated with the need to increase the speed of the expiration of the hydroabrasive jet for cutting materials at previously inaccessible speeds due to the achieved technical limit of pumping equipment by introducing a high-speed flow of surfactants(surfactants)into the formation zone.The technical limit is due to the thermodynamic properties of water,which freezes at a pressure of about 900 MPa.
        Therefore,studies aimed at studying the effect of multifunctional surfactant additives in the zone of formation of a hydroabrasive jet on the dynamics of the cutting process are relevant and of great scientific and practical importance.Despite the fact that a large number of works are devoted to the mechanisms of reducing hydraulic resistance with surfactant additives in the world scientific literature,there is no single point of view regarding the mechanism for reducing turbulent friction at high speeds.The main problem is that the description of the complex process of interaction of particles of a multiphase medium with surfactant additives with the walls of a millimeter-wave channel in a general mathematical formulation is impossible.
        The purpose of the project is to study the effect of multifunctional surfactant additives in the formation zone of a hydroabrasive jet on its cutting and dynamic properties.
        Project objectives:
        1.Conduct an analytical review of the effect of multifunctional surfactant additives in the zone of formation of a hydroabrasive jet on the dynamics of the cutting process.
        2.To establish patterns of change in the concentration of surfactant additives in the zone of formation of a hydroabrasive jet.
        3.To reveal patterns of change in the cutting and dynamic properties of a hydroabrasive jet depending on the surfactant concentration.
        4.To reveal the patterns of influence of the concentration of surfactant molecules on the characteristics of near-wall turbulence in the nozzle channel,the level of hydraulic resistance and turbulent friction.
        5.Development of recommendations for the introduction of multifunctional surfactant additives to improve the cutting and dynamic properties of the hydroabrasive jet.
        Research is based on modern methods of condensed matter physics,chemical hydrodynamics,micropolar medium thermodynamics and continuum mechanics.Modeling of liquid motion near the phase separation will be performed on the basis of a model of micropolar media,which will allow using the kinematic independence of the microrotation vectors of molecules and their velocity.Modeling of the movement of a hydroabrasive flow in the nozzle channel will be based on the solution of the Reynolds-averaged Navier-Stokes equations.Research into the mechanisms of abrasive capture by a liquid jet in a nozzle will be performed using Dupree's equations for the work of adhesion of a liquid particle to the abrasive surface.For mathematical modeling of the interaction of an abrasive particle with the channel walls,taking into account the influence of surfactants on this process,a model of a plastically compressible medium will be used.
        The scientific significance lies in the fact that the obtained dependencies and regularities will be based on new methods and approaches for describing the effect of multifunctional surfactant additives on the cutting and dynamic properties of a hydroabrasive jet.
        The application of the developed analytical methods will make it possible to obtain solutions for the effective introduction of a surfactant additive into the formation zone of a hydroabrasive jet and to ensure cutting materials with a hydroabrasive jet at previously inaccessible speeds.
        Expected results:1.Analytical review of the effect of multifunctional surfactant additives in the zone of formation of a hydroabrasive jet on the dynamics of the cutting process:analysis of the main physicochemical properties of surfactants and their layers;analysis of the effect of molecular layers of surfactants on the hydraulic resistance of the channels of hydraulic systems;analysis of physical processes occurring during the interaction of surfactants with dry abrasive in air and liquid media and their mathematical models.During the stage,the results obtained on the project topic from scientific and technical literature,scientific publications in publications included in bibliographic databases(Scopus,RSCI,RSCI),materials of Russian and international symposiums and conferences will be analyzed and summarized.
        2.Patterns of the influence of the concentration of surfactant molecules,the flow rate of the working medium,the roughness of the channel surface on the characteristics of near-wall turbulence in the nozzle channel,the level of hydraulic resistance and turbulent friction.Modeling of the movement of a hydroabrasive flow modified by surfactant in the nozzle channel will be carried out on the basis of solving the Navier-Stokes equations using the k-ε turbulence model.Functions will be obtained to correct the motion model associated with the inertia of the abrasive and with the fluid velocity gradient,taking into account the influence of surfactants and the proximity of the nozzle channel wall.A solution of the equations will be obtained,which will allow to make an assessment of the necessary kinematic characteristics of the movement of abrasive particles(velocity,direction),taking into account the distribution profile of abrasive particles interacting with the walls of the nozzle nozzle,necessary to build a mathematical model of the movement of a homogeneous medium,taking into account the influence of surfactants.When modeling the interaction of an abrasive particle entrained by a liquid flow with the channel walls,taking into account the influence of a surfactant on this process,a model of a plastically compressible medium will be used as a barrier model.The solution of the described equations will allow for the first time to obtain an expression for determining the pressure on the contact surface of the abrasive particle with the nozzle channel,which determines the level of hydraulic resistance and turbulent friction in the jet-forming nozzle channel.
        Fig.3.Dependences of the radial component of shock waves in the structure of the jet,wear of the focusing tube of the nozzle,time of through puncture of the material being processed,the force of the impact of the hydroabrasive jet on the barrier on the concentration of surfactants,which will allow us to develop practical recommendations for the introduction of multifunctional surfactant additives into the zone of formation of a hydroabrasive jet for cutting materials hydroabrasive jet at previously inaccessible speeds.
        4.Development of recommendations on the introduction of multifunctional surfactant additives into the zone of formation of a hydroabrasive jet,which allow cutting materials with a hydroabrasive jet at previously inaccessible speeds.
        The results of the project implementation will make it possible to overcome the technological limit that has arisen in the development of waterjet cutting technology by introducing multifunctional surfactant additives into the zone of formation of a waterjet jet,which make it possible to cut materials at previously inaccessible speeds.
        This work is aimed at solving specific problems identified in the framework of the Strategy for Scientific and Technological Development of the Russian Federation in the field of creating new technologies.
        The implementation of the project contributes to the formation in Russia of a new direction of advanced technological development,competitive both in the domestic and world markets in providing standard equipment for cutting materials with a hydroabrasive jet at previously inaccessible speeds.

Application Abstract: Annotation:The project is aimed at solving the actual problem of cutting materials at previously inaccessible speeds by expanding the technological capabilities of the advanced production technology of waterjet cutting.Waterjet cutting is one of the most demanded technologies in the world.Especially important is the use for deep-water cutting,including in the Arctic.
        The problem of the proposed project is associated with the need to increase the speed of the expiration of the hydroabrasive jet for cutting materials at previously inaccessible speeds due to the achieved technical limit of pumping equipment by introducing a high-speed flow of surfactants(surfactants)into the formation zone.The technical limit is due to the thermodynamic properties of water,which freezes at a pressure of about 900 MPa.
        Therefore,studies aimed at studying the effect of multifunctional surfactant additives in the zone of formation of a hydroabrasive jet on the dynamics of the cutting process are relevant and of great scientific and practical importance.Despite the fact that a large number of works are devoted to the mechanisms of reducing hydraulic resistance with surfactant additives in the world scientific literature,there is no single point of view regarding the mechanism for reducing turbulent friction at high speeds.The main problem is that the description of the complex process of interaction of particles of a multiphase medium with surfactant additives with the walls of a millimeter-wave channel in a general mathematical formulation is impossible.
        The purpose of the project is to study the effect of multifunctional surfactant additives in the formation zone of a hydroabrasive jet on its cutting and dynamic properties.
        Project objectives:
        1.Conduct an analytical review of the effect of multifunctional surfactant additives in the zone of formation of a hydroabrasive jet on the dynamics of the cutting process.
        2.To establish patterns of change in the concentration of surfactant additives in the zone of formation of a hydroabrasive jet.
        3.To reveal patterns of change in the cutting and dynamic properties of a hydroabrasive jet depending on the surfactant concentration.
        4.To reveal the patterns of influence of the concentration of surfactant molecules on the characteristics of near-wall turbulence in the nozzle channel,the level of hydraulic resistance and turbulent friction.
        5.Development of recommendations for the introduction of multifunctional surfactant additives to improve the cutting and dynamic properties of the hydroabrasive jet.
        Research is based on modern methods of condensed matter physics,chemical hydrodynamics,micropolar medium thermodynamics and continuum mechanics.Modeling of liquid motion near the phase separation will be performed on the basis of a model of micropolar media,which will allow using the kinematic independence of the microrotation vectors of molecules and their velocity.Modeling of the movement of a hydroabrasive flow in the nozzle channel will be based on the solution of the Reynolds-averaged Navier-Stokes equations.Research into the mechanisms of abrasive capture by a liquid jet in a nozzle will be performed using Dupree's equations for the work of adhesion of a liquid particle to the abrasive surface.For mathematical modeling of the interaction of an abrasive particle with the channel walls,taking into account the influence of surfactants on this process,a model of a plastically compressible medium will be used.
        The scientific significance lies in the fact that the obtained dependencies and regularities will be based on new methods and approaches for describing the effect of multifunctional surfactant additives on the cutting and dynamic properties of a hydroabrasive jet.
        The application of the developed analytical methods will make it possible to obtain solutions for the effective introduction of a surfactant additive into the formation zone of a hydroabrasive jet and to ensure cutting materials with a hydroabrasive jet at previously inaccessible speeds.
        Expected results:1.Analytical review of the effect of multifunctional surfactant additives in the zone of formation of a hydroabrasive jet on the dynamics of the cutting process:analysis of the main physicochemical properties of surfactants and their layers;analysis of the effect of molecular layers of surfactants on the hydraulic resistance of the channels of hydraulic systems;analysis of physical processes occurring during the interaction of surfactants with dry abrasive in air and liquid media and their mathematical models.During the stage,the results obtained on the project topic from scientific and technical literature,scientific publications in publications included in bibliographic databases(Scopus,RSCI,RSCI),materials of Russian and international symposiums and conferences will be analyzed and summarized.
        2.Patterns of the influence of the concentration of surfactant molecules,the flow rate of the working medium,the roughness of the channel surface on the characteristics of near-wall turbulence in the nozzle channel,the level of hydraulic resistance and turbulent friction.Modeling of the movement of a hydroabrasive flow modified by surfactant in the nozzle channel will be carried out on the basis of solving the Navier-Stokes equations using the k-ε turbulence model.Functions will be obtained to correct the motion model associated with the inertia of the abrasive and with the fluid velocity gradient,taking into account the influence of surfactants and the proximity of the nozzle channel wall.A solution of the equations will be obtained,which will allow to make an assessment of the necessary kinematic characteristics of the movement of abrasive particles(velocity,direction),taking into account the distribution profile of abrasive particles interacting with the walls of the nozzle nozzle,necessary to build a mathematical model of the movement of a homogeneous medium,taking into account the influence of surfactants.When modeling the interaction of an abrasive particle entrained by a liquid flow with the channel walls,taking into account the influence of a surfactant on this process,a model of a plastically compressible medium will be used as a barrier model.The solution of the described equations will allow for the first time to obtain an expression for determining the pressure on the contact surface of the abrasive particle with the nozzle channel,which determines the level of hydraulic resistance and turbulent friction in the jet-forming nozzle channel.
        Fig.3.Dependences of the radial component of shock waves in the structure of the jet,wear of the focusing tube of the nozzle,time of through puncture of the material being processed,the force of the impact of the hydroabrasive jet on the barrier on the concentration of surfactants,which will allow us to develop practical recommendations for the introduction of multifunctional surfactant additives into the zone of formation of a hydroabrasive jet for cutting materials hydroabrasive jet at previously inaccessible speeds.
        4.Development of recommendations on the introduction of multifunctional surfactant additives into the zone of formation of a hydroabrasive jet,which allow cutting materials with a hydroabrasive jet at previously inaccessible speeds.
        The results of the project implementation will make it possible to overcome the technological limit that has arisen in the development of waterjet cutting technology by introducing multifunctional surfactant additives into the zone of formation of a waterjet jet,which make it possible to cut materials at previously inaccessible speeds.
        This work is aimed at solving specific problems identified in the framework of the Strategy for Scientific and Technological Development of the Russian Federation in the field of creating new technologies.
        The implementation of the project contributes to the formation in Russia of a new direction of advanced technological development,competitive both in the domestic and world markets in providing standard equipment for cutting materials with a hydroabrasive jet at previously inaccessible speeds.