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شبیهسازی خوردگی حفرهای روی پرهی کمپرسور توربین گازی | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| مقاله 6، دوره 53، شماره 10، دی 1400، صفحه 5123-5140 اصل مقاله (2.77 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2021.19342.7003 | ||
| نویسندگان | ||
| یوسف ملاپور1؛ اسماعیل پورسعیدی* 2 | ||
| 1دانشجوی دکتری مکانیک، دانشکده فنی و مهندسی، دانشگاه زنجان | ||
| 2عضو هیئت علمی دانشکده مهندسی دانشگاه زنجان* | ||
| چکیده | ||
| پرههای متحرک ردیف اول چهار کمپرسور جریان محوری توربین گازی به دلیل وجود اجزای خورنده در محیط و افزایش امکان ایجاد حفره روی پرهها بهطور ناگهانی شکسته شدند. در این پژوهش به بررسی عددی و آزمایشگاهی خوردگی حفرهای روی پرهی کمپرسور توربین گازی در شرایط کارکرد واقعی پرداخته میشود. بررسیهای میکروسکوپ الکترونی روبشی و شکستنگاری پرهی شکسته شده، نشان داد که حفرهها تحت مکانیزم ترک خوردگی تنشی بههم متصل شده و یک حفرهی بزرگتر را تشکیل دادهاند که این موجب کاهش بیشتر زمان واماندگی شده است. حفرههای موجود روی پره، با نرمافزار کامسول شبیهسازی و تحت نیروهای وارده تحلیل شده است. حفرهها به یکدیگر متصل شده و به ترک خوردگی تنشی تبدیل میشود و با عنایت به خورندگی محیط، مکانیزم خستگی خوردگی نیز فعال میشود. ناحیهی تمرکز تنش در حفرهها واضح است که محل شروع ترک خوردگی تنشی و خستگی خوردگی میباشند. وجود حفرههای روی پره، باعث افزایش تنش برابر 130 مگاپاسکال نسبت به پره بدون حفره شده است. نتایج بدست آمده مطابقت مناسبی با مشاهدات در محل ترک و نتایج تجربی دارد که صحهگذار بر درستی شبیهسازی عددی میباشد. | ||
| کلیدواژهها | ||
| آلیاژ کاستوم 450؛ خوردگی حفرهای؛ نرمافزار کامسول؛ ترک خوردگی تنشی؛ پرهی کمپرسور | ||
| عنوان مقاله [English] | ||
| Simulation of Pitting Corrosion on Gas Turbine Compressor Blade | ||
| نویسندگان [English] | ||
| Yousef Mollapour1؛ Esmaeil PourSaeidi2 | ||
| 1Department of Mechanical Engineering, University of Zanjan, Zanjan, Iran | ||
| 2Mechanical engineering departmant.university of zanjan | ||
| چکیده [English] | ||
| The first row rotating blades of four axial-flow compressors were prematurely fractured. Previous investigations showed that the site atmosphere contains corrosive compounds which lead to an increase in the possibility of pitting on the blades. To this end, experimental and numerical studies are considered. Replica testing, scanning electron microscope and fractography of the broken blade indicate that the pits join together and make one bigger pit under stress-corrosion cracking mechanism which reduces the failure time. 3-D models of the pitting on the blade under existing forces are analyzed by COMSOL Multiphysics software. Finite element analysis shows good similarities with fractography photos. Stress concentration and interaction of stresses around the pits are two mechanical reasons for the initiation and growth of cracks. Calculations show that the occurrence of stress-corrosion cracking at the location of the pit reduces the crack initiation time to half. The presence of pits increased the stress by approximately 130 MPa relative to the healthy blade. The part between the two pits with a stress of approximately 180 MPa showed the interaction of the two pits in the operating conditions of the compressor blade. | ||
| کلیدواژهها [English] | ||
| CUSTOM 450 alloy, Pitting corrosion, COMSOL Multiphysics software, Stress corrosion cracking, compressor blade | ||
| مراجع | ||
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