Theflow kinetic-energy conversion into the pressure-forcesfield in the outlet turbine diffuser increases the heat drop to the last stage,generating additional power.The recovery properties of the diffuser are determin...Theflow kinetic-energy conversion into the pressure-forcesfield in the outlet turbine diffuser increases the heat drop to the last stage,generating additional power.The recovery properties of the diffuser are determined predominantly by the inlet boundary conditions of theflow formed by the last turbine stage.This study aims to demonstrate the influence of the last turbine stage swirl law on the boundary conditions formation at the diffuser inlet.The aerodynamics of the“turbine stageeexhaust diffuser”system(“SeD”system)was studied by an experi-mental method.The experimental results validated the numerical model of theflow in the“SeD”system.The stage's integral characteristics,the diffuser,and the“SeD”system were obtained for three system geometry variants.The results of the experiments revealed the indisputable advantage of the“negative”swirl law of the last turbine stage.An analysis of theflow structure based on the numerical simulation results revealed the details of the advantages of the boundary conditions at the diffuser inlet formed by the stage with a“negative”swirl compared with the stage with the traditional swirl law.Based on the results,recommendations for the“SeD”system design of powerful stationary gas turbines are proposed.展开更多
基金funded by the Ministry of Science and Higher Educ ation of the Rus sian Federation as part of the World-class Research Center program:Advanced Digital Technologies(contract No.075-15-2022-311 dated April 20,2022).
文摘Theflow kinetic-energy conversion into the pressure-forcesfield in the outlet turbine diffuser increases the heat drop to the last stage,generating additional power.The recovery properties of the diffuser are determined predominantly by the inlet boundary conditions of theflow formed by the last turbine stage.This study aims to demonstrate the influence of the last turbine stage swirl law on the boundary conditions formation at the diffuser inlet.The aerodynamics of the“turbine stageeexhaust diffuser”system(“SeD”system)was studied by an experi-mental method.The experimental results validated the numerical model of theflow in the“SeD”system.The stage's integral characteristics,the diffuser,and the“SeD”system were obtained for three system geometry variants.The results of the experiments revealed the indisputable advantage of the“negative”swirl law of the last turbine stage.An analysis of theflow structure based on the numerical simulation results revealed the details of the advantages of the boundary conditions at the diffuser inlet formed by the stage with a“negative”swirl compared with the stage with the traditional swirl law.Based on the results,recommendations for the“SeD”system design of powerful stationary gas turbines are proposed.
