eva‎luation of the performance of different geometrical structures of Casing Treatment in the state of not covering the axial chord of the blade tip of the rotating component (43/4)percent in the axial flow compressor

6/29/2025 12:00:00 AM

In the current project, the performance of the improving wall with subsequent vanes was investigated and eva‎luated. It is important to use this type of improving wall in the sense that it is a method of passive control of the stall phenomenon and increases the safe margin of stalling. In this project, firstly, the simulation of the improving structure without wall of a laboratory compressor has been done and the results of this simulation have been eva‎luated with its experimental results. In the next step, the results obtained from the simulation of the semi-tube structure with no coverage of the axial chord (43/4) percent have been analyzed with the existing experimental results. In the last step, the simulation of three types of semi-circular, semi-elliptical, and semi-heart-shaped improvement walls, all with no coverage of the axial chord (43/4) percent, and the effect of each of these walls on various components has been investigated. The amount of safety margin created and also its improvement by each of the improving walls was investigated. The results of the eva‎luations indicate that all the improving walls, despite having improved the safe margin of the stall, have also caused a drop in efficiency. Also, the investigations showed that the maximum amount of stall safe margin created based on the pressure increase coefficient for the semi-circular improving wall was obtained with a value of (23/05) percent. The highest amount of improvement of the safety margin of the stall from the point of view of modified mass flow to the semi-heart-shaped improvement wall with the value of (18/24) percent and based on the pressure increase coefficient to the semi-circular improvement wall with the value of (34/47) percent and according to the combination of the pressure increase factor and The flow coefficient was assigned to the semi-circular improving wall with a value of (11/12) percent. Also, the highest and the lowest amount of total maximum efficiency loss was assigned to the semi-elliptical improving wall with a value of (15/14) percent and the semi-tubular improving wall with a value of (10/26) percent, respectively.

توربوماشين , كمپرسور جريان محوري , استال (واماندگي) , سرج (خفقان) , حاشيه امن , جداره بهبوددهنده , جداره‌هاي بهبوددهنده با پره‌هاي به عقب كشيده

turbo machine , axial flow compressor , Stall , Surge , Stall margin , Casing Treatment , Vane Recessed Casing Treatment

Mohammad Zeinalzadeh

Dr. Mohammad Akhlaghi