| Turbine cooler is a kind of rotating machinery that realizes the process of near isentropic expansion.It is not only widely used in the chemical fields such as liquefaction and refrigeration of very low temperature hydrogen and ammonia,but also widely used in the environmental control system of aerospace vehicles,tanks and submarines.Among them,the aerodynamic pressure suspension turbine cooler driven by power turbine has good application prospects in the refrigeration fields such as chemistry and aerospace because of its high efficiency and energy saving.However,due to the complexity of the matching of the three core components of the turbine cooler and the design of high-efficiency impeller,the aerodynamic suspension turbine cooler has not been localized.This paper studies these key problems.(1)Based on the working principle,mathematical model and known initial conditions of the turbine cooler driven by the power turbine,a matching process system of the centrifugal compressor end,the power turbine end and the refrigeration turbine end is constructed,and the rotational speed,Flow and import and export parameters.(2)The advanced quasi three-dimensional aerodynamic design method is used to design the three working ends efficiently,and their threedimensional modeling is designed by cfturbo.The three-dimensional model is improved by UG and the blade parameters are extracted to prepare for flow simulation.The preliminary type selection design of the hydrodynamic foil bearing is completed,and the selected hydrodynamic foil bearing has sufficient bearing capacity.(3)The grid processing of centrifugal compressor and refrigeration turbine is completed through NUMECA software,and their single blade periodic grid is obtained.The aerodynamic simulation is completed with the help of fine/Turbo module.The results show that the efficiency of centrifugal compressor and refrigeration turbine is more than 80%,which meets the high-efficiency design requirements.Finally,the simulation results are analyzed through cfview module.(4)In order to improve the efficiency of power turbine,the influence on turbine performance is studied by changing the number of nozzles and nozzle opening angle,the optimal scheme is selected,and the power turbine end is analyzed through cloud diagram.(5)An experimental measurement platform was built,and the startstop experiment of the turbo cooler was carried out.At a speed of58000 rpm,the parameters of the inlet and outlet of the three core components were measured,and the measured data was compared and analyzed with the simulation data. |
