نوع مقاله : علمی- ترویجی
نویسنده
استادیار، گروه هوافضا، دانشکده انرژی های تجدیدپذیر، دانشگاه صنعتی ارومیه، ارومیه، ایران.
چکیده
در این تحقیق عملکرد موتور توربوجت J85-GE21 با تحلیل اگزرژی اجزای تشکیل‌دهندة آن مورد ارزیابی قرار گرفته است. با استفاده از روابط تعادل اگزرژی، عملکرد موتور توربوجت و اجزای آن برای بارگذاری‌های توانی مختلف در دو ارتفاع سطح دریا و 000,11 متری و در چندین سرعت پروازی بررسی شده است. بالاترین بازدة اگزرژی در سطح دریا مربوط به کمپرسور با 72/96% بوده و پس از آن نازل و توربین به ترتیب با 70/93% و 31/92% قرار دارند. با کاهش سرعت هوای ورودی به موتور در هر ارتفاعی، بازده تمامی اجزاء موتور و بازده کلی کاهش یافت. کمترین بازدة اگزرژی در سطح دریا مربوط به پس‌سوز با 81/54% و پس از آن محفظة احتراق با 42/80% بود. افزایش ارتفاع باعث کاهش 70% اتلاف اگزرژی موتور می‌شود. بازده کلی موتور با فرض ثابت بودن فشار هوا با افزایش درجه حرارت هوای ورودی به ازای هر یک درجه افزایش درجه حرارت، 45/0% کاهش می‌یابد.
کلیدواژه‌ها
موضوعات
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