طراحی و تحلیل عددی یک مبدل حرارتی پوسته لوله پره‌گذاری‌شده برای کاربرد در موتور یک بالگرد خاص

نوع مقاله : مقاله پژوهشی

نویسندگان

1 عضو هیات علمی / دانشگاه امام علی (ع)، تهران، ایران

2 عضو هیات علمی / دانشکده مهندسی، دانشگاه امام علی، تهران، ایران

3 دانشجوی کارشناسی ارشد / دانشکده مهندسی مکانیک، دانشگاه صنعتی قم

چکیده

برخی هلیکوپترهای ارتش ایران که سال‌هاست استفاده می‌شود و فرسوده شده‌است، نیاز به تعمیر یا تعویض برخی قطعات آن را دارد. از جمله مبدل حرارتی که در این مقاله به صورت پوسته و لوله برای انتقال حرارت بین دو سیال مختلف که در هلیکوپترها، پهپادها و هواپیماها استفاده می‏شود، به‌صورت سه‏بعدی شبیه‏سازی شده‌است. سیال جاری در پوسته، روغن MIL-PRF 23699 و سیال جاری در لوله‏ها، سوخت JP-4 است. در این پروژه لوله‌ها به‌صورت U شکل و پره‌دار طراحی شدند تا انتقال حرارت بیشتری ایجاد شود و با استفاده از نرم‌افزار Aspen طراحی به گونه‌ایی انجام‌شده که طول کمتر و وزن کمتری داشته باشد تا وزن و ابعاد مبدل حرارتی مورداستفاده در هلیکوپتر کمتر و راندمان بالاتری داشته باشد. در این شبیه‏سازی‏ اثر تغییر هندسه لوله‏ها، دبی جرمی سوخت و روغن بر پارامترهای انتقال حرارت و هیدرولیکی مبدل بررسی‌شده‌است. لوله‏های انتخاب‌شده برای مبدل حرارتی شامل دو نوع بدون پره و پره‏دار می‌باشد و طراحی این نوع لوله‌های پره‌دار با سایر کارها متمایز شده‌ست. نتایج حاصل از این شبیه‏سازی نشان می‏دهد که نرخ انتقال حرارت بین سوخت و روغن برای مبدل حرارتی با لوله‏های پره‏دار(7400وات)، حدود 12 درصد بیشتر از حالت بدون پره(6600وات) است. همچنین کاهش دبی جرمی روغن واردشده به پوسته موجب افزایش بازدهی مبدل حرارتی می‏شود. نتایج این شبیه‏سازی‏ می‏تواند برای طراحی مبدل‏های حرارتی پوسته و لوله با ظرفیت‏های مختلف استفاده شود.

کلیدواژه‌ها

عنوان مقاله [English]

Numerical design and analysis of a shell & finned tube heat exchanger for use in the engine of a special helicopter

نویسندگان [English]

  • Mohsen Rostami 1
  • Amirhamzeh Farajollahi 2
  • morteza ghanbari 3
1 Imam Ali university, Tehran, Iran
2 department of engineering, imam ali university, tehran, iran
3 Department of mechanical engineering, Qom university of technology
چکیده [English]

In this paper, a shell and tube heat exchanger used to transfer heat between two different fluids is simulated in three dimensions.This converter consists of a shell with 90 U-shaped tubes inside.For further heat transfer, the tubes were simulated and compared once without fins and again with fins, which are produced longitudinally and integrally with the tube body.The current flowing in the shell is MIL-PRF23699 oil and the flowing fluid in the tubes is JP-4 fuel.These two fluids flow in separate and opposite directions and exchange heat with each other through contact with the surface of the tubes. Using Aspen software, the design is done in such a way that the heat exchanger has a shorter length and weight to have a better and higher effect on the efficiency of the helicopter.To investigate the effect of tube geometry and oil mass flow on the rate of heat transfer between fuel and oil, simulation has been performed in ANSYSFluent program.In this simulation, a part of the whole heat exchanger is selected as the geometry and the effect of changing the geometry of the tubes, mass flow of fuel and oil on the heat transfer coefficient, Colburn coefficient, coefficient of friction and their ratio, and outlet temperature changes are investigated.The results of this simulation show that the heat transfer rate between fuel and oil for a heat exchanger with finned tubes is about11%higher than without a fin.Also,reducing the mass flow of oil entering the shell increases the efficiency of the heat exchanger.

کلیدواژه‌ها [English]

  • Shell and tube heat exchanger
  • colburn factor
  • heat transfer
  • fin tube
  • friction factor

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