In this paper,a novel swing vane rotary compressor(SVC)was introduced,which had significant advantages-simple mechanism,reduced frictional loss,reliable operation,and a comparatively higher compression ratio.Based on ...In this paper,a novel swing vane rotary compressor(SVC)was introduced,which had significant advantages-simple mechanism,reduced frictional loss,reliable operation,and a comparatively higher compression ratio.Based on the swing vane compressor geometry model,thermodynamic model and kinetic model,the mathematical model of optimum design was established,and further theoretical and experimental studies were conducted.The length of the cylinder,radius of the rotor and cylinder were defined as design variables and the reciprocal of EER as objective function.The complex optimization method was adopted to study the structure of the swing vane compressor.The theoretical model could provide an effective method for predicting compressor performance,which would also contribute to structural optimization of the SVC.The study shows that the friction loss of the compressor are greatly reduced by optimized design in a given initial value,and the EER increased by 8.55%.展开更多
To expand the stable operating range of compressors, understanding the mechanism of flow instability at low flow rates is necessary. In this paper, the mechanism of stall and surge in a centrifugal compressor with a v...To expand the stable operating range of compressors, understanding the mechanism of flow instability at low flow rates is necessary. In this paper, the mechanism of stall and surge in a centrifugal compressor with a variable vaned diffuser is experimentally investigated, where the diffuser blade setting angle can be adjusted. Many dynamic pressure transducers are mounted on the casing surface of the compressor. From the design condition to surge, dynamic pressure data is recorded throughout the gradual process. According to the signal developing status, the typical modes of compressor instability are defined in detail, such as stall, mild surge, and deep surge. A relatively high-frequency stall wave originates in the impeller and propagates to the diffuser, and finally stimulates a deep surge in the compressor. The compressor behavior during surge differs at different diffuser vane angles. When the diffuser vane angle is adjusted, both the unstable form and the core factor affecting the overall machine stability change. A specific indicator is proposed to measure the instability of each component in a compressor, which can be used to determine the best region for stability extension technologies, such as a holed casing treatment, in different compressor applications.展开更多
文摘In this paper,a novel swing vane rotary compressor(SVC)was introduced,which had significant advantages-simple mechanism,reduced frictional loss,reliable operation,and a comparatively higher compression ratio.Based on the swing vane compressor geometry model,thermodynamic model and kinetic model,the mathematical model of optimum design was established,and further theoretical and experimental studies were conducted.The length of the cylinder,radius of the rotor and cylinder were defined as design variables and the reciprocal of EER as objective function.The complex optimization method was adopted to study the structure of the swing vane compressor.The theoretical model could provide an effective method for predicting compressor performance,which would also contribute to structural optimization of the SVC.The study shows that the friction loss of the compressor are greatly reduced by optimized design in a given initial value,and the EER increased by 8.55%.
基金supported by the National Natural Science Foundation of China (No.51276108)
文摘To expand the stable operating range of compressors, understanding the mechanism of flow instability at low flow rates is necessary. In this paper, the mechanism of stall and surge in a centrifugal compressor with a variable vaned diffuser is experimentally investigated, where the diffuser blade setting angle can be adjusted. Many dynamic pressure transducers are mounted on the casing surface of the compressor. From the design condition to surge, dynamic pressure data is recorded throughout the gradual process. According to the signal developing status, the typical modes of compressor instability are defined in detail, such as stall, mild surge, and deep surge. A relatively high-frequency stall wave originates in the impeller and propagates to the diffuser, and finally stimulates a deep surge in the compressor. The compressor behavior during surge differs at different diffuser vane angles. When the diffuser vane angle is adjusted, both the unstable form and the core factor affecting the overall machine stability change. A specific indicator is proposed to measure the instability of each component in a compressor, which can be used to determine the best region for stability extension technologies, such as a holed casing treatment, in different compressor applications.
