تحقیقات موتور

تحقیقات موتور

اثر تغییر سوخت از بنزین به گاز طبیعی فشرده بر عمر خستگی پرچرخه سمبة موتور M13

نوع مقاله : مقاله پژوهشی

نویسنده
گروه مکانیک، واحد ورامین-پیشوا، دانشگاه آزاد اسلامی، ورامین، ایران
چکیده
سمبه یک موتور تحت بارگذاری شدید حرارتی و مکانیکی قرار دارد. خستگی ناشی از بارگذاری هم‌زمان حرارتی و مکانیکی، نقش تعیین کننده‌ای در ایجاد آسیب و کاهش عمر سمبه‌ دارد. بنابراین شبیه‌سازی و تحلیل عمر خستگی آن ضروری است. هدف این پژوهش ارزیابی عمر خستگی پرچرخه سمبه با تغییر سوخت آن از بنزین به گاز طبیعی فشرده است. در این پژوهش، تحلیل عمر خستگی پرچرخه سمبه با استفاده از روش اجزای محدود و نرم‌افزار انسیس به منظور پیش‌بینی دما و تنش و سپس عمر خستگی پرچرخه با استفاده از تئوری گودمن و نرم‌افزار ANSYS nCode Design Life انجام شده است. با توجه به پایینتر بودن سرعت احتراق سوخت گاز طبیعی نسبت به بنزین، طول دوره احتراق در حالت سوخت گاز طبیعی طولانی‌تر می‌شود. بنابراین سمبه در وضعیت گاز نسبت به بنزین دما و تنش بیشتری را تحمل خواهد کرد. درنتیجه عمر خستگی سمبه در وضعیت گاز نسبت به بنزین بصورت قابل ملاحظه‌ای کاهش خواهد یافت. نتایج عددی نشان داد که حداکثر دما در مرکز تاج سمبه رخ می‌دهد. براساس نتایج تحلیل ترمومکانیکی، سمبه در وضعیت گاز نسبت به وضعیت بنزین درحدود 24 درجه سانتیگراد و 5.036 مگاپاسکال تنش بیشتری را تحمل می‌کند. نتایج تحلیل خستگی نشان داد که جایگزینی گاز به‌جای بنزین باعث کاهش عمر خستگی پرچرخه سمبه در حدود 108×1.438 چرخه‌ یا حدود 29درصد خواهد شد. برای بررسی صحت نتایج تحلیل ترمومکانیکی و عمر خستگی پرچرخه، نتایج شبیه‌سازی شده با نمونه واقعی سمبه آسیب دیده مقایسه گردید و نشان داده شد که نواحی بحرانی، مطابقت مناسبی با نواحی گسیختگی در نمونه واقعی دارد.
کلیدواژه‌ها

عنوان مقاله English

The effect of changing fuel from gasoline to compressed natural gas on the high cycle fatigue life of M13 engine piston

نویسنده English

Hojjat Ashouri
Department of Mechanic, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran, Iran
چکیده English

Engine pistons are subjected to severe thermo-mechanical loading. The resulting high-cycle fatigue (HCF) is the dominant damage mechanism and governs service life; hence, reliable fatigue-life prediction is essential. This study quantifies the influence of switching the fuel from gasoline to compressed natural gas (CNG) on the HCF life of a gasoline-engine piston. A sequentially coupled thermo-mechanical finite-element model was built in ANSYS; temperatures and stresses were exported to nCode Design-Life and the Goodman mean-stress correction was applied to estimate HCF life. Because CNG burns more slowly than gasoline, the combustion event is longer, so the piston crown is exposed to higher temperatures and stresses under CNG operation. The simulation shows that the peak temperature rises by 24 °C and the maximum stress by 5.04 MPa when CNG is used. Consequently, the predicted HCF life drops by 1.44 × 10⁸ cycles (≈ 29 %). The numerically identified critical location coincides with the crack initiation site observed in a failed piston, validating the model.

کلیدواژه‌ها English

Compressed Natural Gas
Gasoline
Piston
High Cycle Fatigue Life
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  • تاریخ دریافت 24 مرداد 1404
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