Space-time Characteristics of Three-dimensional Unsteady Flow Field in a Vacuum Suction Wind Tunnel
In order to provide reference for the aerodynamic optimization design of vacuum suction wind tunnel,based on the Fluent simulation platform,computational fluid dynamics(CFD)finite element volume method was used to solve the Reynolds time mean equation(RANS).The spatiotemporal characteristics and evolution law of the three-dimensional unsteady flow field were studied with aerodynamic knowledge and wind tunnel theory.By establishing the mathematical model of the shrinkage section and the vacuum tank,the characteristic parameters were determined.the boundary conditions of fluids are abstracted and full-scale three-dimensional fluid calcula-tion domains are constructed with aerodynamic knowledge.The numerical simulation algorithm of fluid mechan-ics was used and verified by experiments,the results showed that when the volume of the vacuum tank was 2000 m3 and the vacuum degree was 3 kPa,the aerodynamic load of the suspension launcher in the air could be well simulated.In the core area of the flow field in the test section,the flow field quality was good,and a stable flow field of 0.80 Ma could be provided,which meet the design requirements of 0.40～0.80 Ma and maintaining a stable flow field of 500 ms at least.
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