In order to investigate the design method for a micro centrifugal compressor, which is the most important component of an ultra micro gas turbine, two types of centrifugal impeller with 2-dimensional blade were design...In order to investigate the design method for a micro centrifugal compressor, which is the most important component of an ultra micro gas turbine, two types of centrifugal impeller with 2-dimensional blade were designed, manufactured and tested. These impellers have different shapes of hub on the meridional plane with each other. Moreover, these types of impeller were made for the 5 times and the 6 times size of the final target centrifugal impeller with the outer diameter of 4ram in order to assess the similitude for the impellers. The comparison among the performance characteristics of the impellers revealed the influence of the meridional configuration on the performance and the similitude of the compressors.展开更多
A series of numerical simulations were conducted in both a 1.5stage axial compressor model and a simplified planar cascade model.The cases with different blade sweep schemes in the cascade model were simulated with fr...A series of numerical simulations were conducted in both a 1.5stage axial compressor model and a simplified planar cascade model.The cases with different blade sweep schemes in the cascade model were simulated with free-slip endwalls to minimize the influence of endwall 3-D(three-dimensional)flows.The results obtained in the cascade model were discussed at first for getting a clear insight into the effects of blade sweep without other influences.And then the simulation results of the 1.5stage compressor model were discussed accordingly.The discussions focused on the influences of different meridional flowpath designs,i.e.constant mid radius(CMR)design,constant outer radius(COR)design and constant inner radius(CIR)design,on the performance of the swept blade.The results showed that the most critical effect produced by blade sweep was attributed to the redistribution of local mass-flow-rate in blade spanwise direction.The change of meridional flowpath did not change the mass-flow-rate redistribution behaviors.However,the trends for local mass-flow-rate redistribution in compressor stage model showed some discrepancies compared with the results shown in the planar cascade model.展开更多
文摘In order to investigate the design method for a micro centrifugal compressor, which is the most important component of an ultra micro gas turbine, two types of centrifugal impeller with 2-dimensional blade were designed, manufactured and tested. These impellers have different shapes of hub on the meridional plane with each other. Moreover, these types of impeller were made for the 5 times and the 6 times size of the final target centrifugal impeller with the outer diameter of 4ram in order to assess the similitude for the impellers. The comparison among the performance characteristics of the impellers revealed the influence of the meridional configuration on the performance and the similitude of the compressors.
基金National Science Foundation of China(51006007,51136003,50976009)
文摘A series of numerical simulations were conducted in both a 1.5stage axial compressor model and a simplified planar cascade model.The cases with different blade sweep schemes in the cascade model were simulated with free-slip endwalls to minimize the influence of endwall 3-D(three-dimensional)flows.The results obtained in the cascade model were discussed at first for getting a clear insight into the effects of blade sweep without other influences.And then the simulation results of the 1.5stage compressor model were discussed accordingly.The discussions focused on the influences of different meridional flowpath designs,i.e.constant mid radius(CMR)design,constant outer radius(COR)design and constant inner radius(CIR)design,on the performance of the swept blade.The results showed that the most critical effect produced by blade sweep was attributed to the redistribution of local mass-flow-rate in blade spanwise direction.The change of meridional flowpath did not change the mass-flow-rate redistribution behaviors.However,the trends for local mass-flow-rate redistribution in compressor stage model showed some discrepancies compared with the results shown in the planar cascade model.
