مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

شبیه‌سازی سه‌بعدی محفظه احتراق حلقوی یک میکروتوربین با مخلوط هیدروژن-متان و مدل احتراقی نیمه پیش مخلوط

نوع مقاله : پژوهشی اصیل

نویسندگان
عارف سهرابی
سید مهدی میرساجدی
دانشگاه شهید بهشتی
10.48311/mme.24.12.727
چکیده
این مطالعه به بررسی احتراق مخلوط هیدروژن و متان در محفظه احتراق حلقوی میکروتوربین C30 پرداخته است. هدف اصلی تحقیق ارزیابی تأثیر احتراق پیش مخلوط متان و هیدروژن بر میزان آلایندگی و دمای خروجی در یک محفظه احتراق حلقوی است. شبیه‌سازی‌های انجام شده با استفاده از مدل احتراقی نیمه پیش‌آمیخته و مدل توربولانسی k-ε انجام شده و از تابع چگالی احتمال PDF برای شبیه‌سازی واکنش‌های شیمیایی استفاده می‌شود. برای تحلیل دقیق نتایج در رابطه با میزان آلایندگی تولیدی، تحلیل و مقایسه در دمای ورودی توربین ثابت انجام شد. نتایج نشان می‌دهند که با افزودن هیدروژن به متان حتی در دمای ورودی توربین ثابت به علت افزایش دمای شعله در مقایسه با متان خالص، میزان آلاینده NOx افزایش پیدا می‌کند، اما می‌تواند به کاهش مصرف سوخت تا 35 درصد کمک کند. همچنین مشخص شد که استفاده از مخلوط 60 درصد متان و 40 درصد هیدروژن موجب کاهش 61 درصدی در تولید CO2 می‌شود. این مطالعه نشان داد می‌توان به علت پیش مخلوط بودن سوخت و هوا، هندسه حلقوی و الگوی چرخشی جریان در سراسر محفظه احتراق، در ترکیب سوخت شامل 30 درصد هیدروژن، تولید NOx را به ppm 1/16 رساند، که به طور قابل توجهی کمتر از مقدار ppm 46 گزارش شده در مطالعات پیشین است. همچنین میزان آلاینده CO با افزایش سهم هیدروژن در سوخت 16 درصد کاهش پیدا می‌کند. این نتایج نشان می‌دهد که محفظه‌ احتراق‌های حلقوی با جریان پیش‌مخلوط و استفاده از ترکیب سوخت هیدروژن و متان، پتانسیل بالایی برای کاهش آلاینده‌ها و بهینه‌سازی مصرف سوخت دارند
کلیدواژه‌ها
میکروتوربین
محفظه احتراق
هیدروژن
احتراق پیش آمیخته

موضوعات

عنوان مقاله English

3D Simulation of the Annular Combustion Chamber of a Micro-Turbine with Hydrogen-Methane Mixture and Partially Premixed Combustion Model

نویسندگان English

Aref Sohrabi
Seyyed mahdi Mirsajedi
Shahid Beheshti University
چکیده English

This study investigates the combustion of hydrogen-methane mixtures in the annular combustion chamber of a C30 microturbine. The primary objective is to evaluate the impact of premixed methane-hydrogen combustion on pollutant emissions and outlet temperature in an annular combustion chamber. Simulations were performed using a partially premixed combustion model and the k-ε turbulence model, employing the Probability Density Function (PDF) approach for chemical reaction modeling. To ensure a detailed analysis of pollutant emissions, comparisons were conducted at a constant turbine inlet temperature. The results indicate that adding hydrogen to methane increases NOx emissions due to the higher flame temperature compared to pure methane, even at constant turbine inlet temperatures. However, this blend can reduce fuel consumption by up to 35%. Additionally, a fuel mixture of 60% methane and 40% hydrogen results in a 61% reduction in CO2 emissions. The study further revealed that, owing to the premixed nature of the fuel-air mixture, the annular geometry, and the swirling flow pattern within the combustion chamber, a fuel blend containing 30% hydrogen can lower NOx emissions to 16.1 ppm—significantly less than the 46 ppm reported in previous studies. Moreover, increasing the hydrogen fraction in the fuel reduced CO emissions by 16%. These findings demonstrate that annular combustion chambers with premixed flows and hydrogen-methane fuel blends have considerable potential for reducing pollutant emissions and optimizing fuel consumption

کلیدواژه‌ها English

Microturbine
Combustion chamber
Hydrogen
Premixed Combustion
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مهندسی مکانیک مدرس
دوره 24، شماره 12
آذر 1403
صفحه 727-738