Aerodynamic Design And Study Of Highspeed Variable-operating-condition Turbochargers

As the demand for high-performance heat exchange equipment in modern industry and transportation continues to grow,the turbo cooler,as a core component in the environmental control system of aviation vehicles,offers advantages such as high efficiency and energy saving in terms of supercharging and cooling.However,due to the significant difficulty in matching the various components of the turbo cooler and the pronounced influence of working condition changes,the design plans and changes in working conditions directly impact the stability of the environmental control system’s operation.Therefore,it is crucial to study high-speed variable working condition turbo coolers,and this paper embarks on a comprehensive and in-depth analysis of the aforementioned issues.The main work content is as follows:(1)In this paper,based on the working principles,mathematical models,and established initial conditions of the turbo cooler in the inverse boost air cycle cooling system,we construct a matching process system suitable for the compressor end and the turbine end.In the early design stage,the total axial force of the machine is checked through formula calculations to meet the bearing capacity requirements of the bearings,followed by a calculation of the one-dimensional aerodynamic parameters for the compressor and the turbine.(2)The key components of the turbo cooler are designed in three dimensions and corresponding analyses are conducted using the commercial software CFturbo.Subsequently,the three-dimensional model is further optimized using Solid Works,and the corresponding blade parameters are extracted,thereby preparing for subsequent numerical simulations.(3)The grid division and grid independence verification for the turbine and compressor are accomplished through the NUMECA software.Next,numerical simulations of each component are conducted using the FINE/TURBO module,and theoretical analyses are carried out on the changes in the flow field at their design speeds.Finally,by matching the two-stage compressor and the air duct,the flow field analysis at the design speed is completed,fully verifying the reliability of its performance.(4)Numerical simulations are used to conduct variable working condition simulations on the turbine,compressor,and the complete twostage compressor.The variable working condition characteristic curves of the turbine,compressor,and the complete two-stage compressor are derived,fully verifying their variable working condition performance.This provides a theoretical reference for achieving stable operation of the turbo cooler and further structural optimization.