Study on Structural Strength and Air-tightness Analysis of a Large Axial Compressor Casing

Axial-flow compressor is a kind of large-scale air compressor, of which the casing is themain component. Accessories such as seals, bearing housings, adjustment mechanisms, and couplings are mounted on the compressor casing. Operated under various extreme temperature conditions, the reliability and working efficiency of the compressor aredirectly affected by the structural rigidity, strength, and air-tightness of the compressor casing. In the context of this problem, the FEA software ANSYS was used to calculate the temperature pattern, deformation field, and stress field of the casing under working conditions, hydrotest, and assembly state.Further, study the rigidity, strength and air-tightness of the casing. The rationality of the simplified analysis model is verified by the actual hydrotest data. The results of this analysis show that under all conditions, the deformation of the casing is within the acceptable range. After eliminating abnormal stress of local spot, the stress of all regions is lower than the yield limit of the material. The structural rigidity and strength of the casing are sufficient. The clearance between most splitting surfacesof the flange is less than 1mm, which is in accordance with the working condition of the sealing strip. These analysis results provide a theoretical basis and design reference for the structural design of the casing of this type of axial -flow compressor.