Aerodynamic Design And Noise Simulation Of Dynammic Pressure Gas-floating Compressor

The compressor is an important part of the aircraft's air control machine(ACM).The aircraft's environmental control system requires high-quality clean air to meet the breathing of passengers and drivers in the aircraft environment.Conventional compressors lubricate bearings with oil,which inevitably pollutes the exhaust air.With the advancement of technology,compressors need new qualities to meet the production requirements of modern industry.In the aerospace environment,the compressor is mostly a dynamic pressure gas-floating compressor using a dynamic air foil bears(GFBS).The dynamic pressure air-foil compressor has the characteristics of high pressure ratio,high speed and low noise.The existing literature about compressure of design and simulation,which only analyzes the flow performance and noise level spectrum of the impeller.The calculation of the whole cycle of the impeller takes a long time,and the spectrogram of the aerodynamic noise of the impeller can't specifically show the sound pressure level of each part of the impeller working watershed.The Broudband noise of the split impeller and the DC impeller is simulated.The results of the simulation are analyzed.The simulation results of the aerodynamic noise are verified by simple experiments.This paper introduces the research status of dynamic pressure gas foil bearing compressor technology,centrifugal compressor design,impeller pneumatic calculation and simulation of splitter blade and DC blade noise at home and abroad.In the aerodynamic design of the impeller,according to the existing parameters and working conditions,CFturbo is used to design the three-dimensional model of the impeller,which is divided into two types split and DC blade.The impeller was processed by HYPERMESH,Single impeller periodic simulation of the impeller was performed using Numeca's IGG and FINE modules.With the FINE/OPEN and HEXPRESS modules,the impeller with is subjected to aerodynamic simulation calculation and single-blade periodic simulation structure.The results show that the single-blade periodic aerodynamic simulation and the whole machine calculation aerodynamic simulation results differ by 5%,so the results of the periodic calculations are reliable.With the CFview module,the simulation results of the impeller aerodynamic noise are analyzed to provide a reference for optimization.In this paper,the structure of the dynamic pressure gas-foil compressor is designed by Solidworks and CAD software.GFBS is used to lubricate and support the compressor.A water-cooling heat dissipation system is designed for the residual heat generated by the permanent magnet brushless motor.Properly distribute the motor coil permanent magnets and arrange the space layout reasonably.The seal system is designed by experience to reduce mechanical losses caused by gas leaks.Calculate the stress of GFBS and select a reliable GFBS to support the rotor,arrange the assembly sequence and design a reliable and stable dynamic pressure gas-foil compressor structure.This paper use Navier-Stokes equation to as theoretical support.The mesh is built by Icem.The aerodynamic noise analysis is carried out for the splitter blade and the DC blade.The Broadband sourse and Realizable k-? simulation observer the difference between the splitter blade and the DC blade,and analyzes the difference between the internal noise generation mechanism of the splitter blade and the DC blade to achieve the purpose of controlling noise.