مشخصات پژوهش

خانه /Fracture Analysis of ...
عنوان
Fracture Analysis of Compressor Impellers in Olefin Units: Numerical and Metallurgical Approach
نوع پژوهش مقالات در نشریات
کلیدواژه‌ها
7175 aluminum alloy, compressor impellers, 3D point cloud data
چکیده
,is paper presents a failure analysis conducted in 7175 aluminum alloy compressor impellers used in olefin units which operate at 34500 rpm to compress gas in the process. Some characterizations such as chemical composition, microstructure, and hardness tests were conducted to obtain a detailed evaluation of the base alloy. Furthermore, a finite element method and a 3D point cloud data technique have used to determine critical stress points on the surface of impellers. ,e finite element result showed the root of blades has significant stress concentration. Moreover, the formed cyclic tension has led to a fatigue phenomenon in the root of the blade, so near this location, the local strain accumulation was visible in 3D points cloud data. ,e fractography results showed that the mode of crack progression and the fractured surface would change by changing the stress mode. In addition, CFD modeling for investigating the effect of flow hydrodynamics on the HP and LP compressor blades is analyzed. ,e results revealed that the maximum pressure of gas stream for the rotor speed of 34500 had taken place in the area of a blade that already breakdown took place, and the changes of pressure, stress, and temperature gradients of flow in the HP compressor were significantly higher than the LP compressor.
پژوهشگران مجتبی اسماعیل زاده (نفر اول)، مریم دلشه (نفر دوم)، سیده مینا امیرسادات (نفر سوم)، احمد آذری (نفر چهارم)، روح اله فاتحی (نفر پنجم)، محسن رضایی (نفر ششم به بعد)، حسن بازآی (نفر ششم به بعد)، فرهاد قدیانلو (نفر ششم به بعد)، امیر سعیدی زاد (نفر ششم به بعد)، محسن شریف پور (نفر ششم به بعد)