Study On Thermal Characteristics Of Hydrodynamic Finger Seal Based On Test Environment

As a new type of seal,fingertip seal has the advantages of long life and low leakage,and has a very broad prospect in the fields of aeroengine,gas turbine and so on.At present,the domestic research mainly focuses on the micro research of finger seal system,without considering the influence of test environment on finger seal performance.In this paper,the thermal effect of hydrodynamic fingertip seal system is studied based on the experimental environment.The influence of the temperature field of the test environment on the thermal deformation of the fluid fingertip seal is mainly considered,which provides a theoretical basis for the design of the fluid dynamic pressure fingertip seal.The main work is as follows:In this paper,the three-dimensional modeling software is used to model the test environment,the fluid field inside the cavity and the hydrodynamic fingertip seal.The fluid dynamic fingertip seal system and the heat transfer mode in the test environment are studied.The convection heat transfer model in the test environment is studied.The contact heat resistance,the roughness of the joint surface and the contact heat are studied by designing the contact heat resistance experiment The regression model of contact thermal resistance is established by SPSS software,which provides theoretical basis for the study of the temperature field of the fluid dynamic pressure fingertip seal and the experimental cavity.ANSYS Workbench was used to analyze the thermal fluid structure coupling of experimental cavity and hydrodynamic finger seal.The influence of inlet and outlet of cavity,contact thermal resistance of joint surface,inlet temperature of different inlet cavity on the average temperature of hydrodynamic finger seal system and the influence of thermal effect on the deformation of hydrodynamic finger seal system are analyzed.The results show that:the more the number of air inlets,the more uniform the temperature distribution of the hydrodynamic finger seal system;the setting of the drainage tube has little effect on the average temperature of the number of air inlets,the more uniform the temperature distribution of the hydrodynamic finger seal system;the setting of the drainage tube has little effect on the average temperature of the hydrodynamic finger seal system;the higher the temperature of the interface considering the contact thermal resistance,the more significant the effect is;the deformation of the hydrodynamic finger seal considering the thermal effect is affected by the fixture of the experimental chamber,The total deformation of the left hydrodynamic finger seal system of the experimental chamber is larger than that of the right hydrodynamic finger seal system,and the deformation of the left hydrodynamic finger seal system in Y direction is smaller than that of the right hydrodynamic finger seal system.The deformation of the hydrodynamic finger seal system is positively related to the inlet temperature of the intake chamber,and the deformation considering thermal effect is more significant than that without thermal effect.The research in this paper confirms that the thermal effect plays a very important role in the deformation of hydrodynamic pressure,which provides a theoretical reference for the performance design of hydrodynamic finger seal at high temperature.