سوخت و احتراق

سوخت و احتراق

Influence of Thermal Radiation Models on Prediction of Reactive Swirling Methane/Air Flame in a Model Gas Turbine Combustor

نویسندگان
فرزاد بازدیدی تهرانی 1
حامد زینی وند 2
1 دانشکده مهندسی مکانیک،دانشگاه علم و صنعت ایران،تهران،ایران
2 سازمان هوافضا،تهران،ایران
چکیده
A numerical simulation of reactive swirling methane/air non-premixed flame in a new three-dimensional model combustion chamber is carried out to assess the performance of two thermal radiation models, namely, the Discrete Transfer Radiation Model and the P-1 Model. A Finite Volume staggered grid approach is employed to solve the governing equations.The second-order upwind scheme is applied for the space derivatives of the advection terms in all transport equations. The SIMPLEC algorithm is used to handle the velocity and pressure coupling. The eddy dissipation model is employed to predict the heat release and the Reynolds stress turbulence model is applied to simulate the flow behavior. A weighted-sum-of-gray-gases model is used for the gas radiative properties. Computational results with and without the radiation effects are compared with the available experimental data and the two radiation models are evaluated in terms ofcomputational efficiency and prediction accuracy.Comparison of present numerical results with experimental data reveals that the thermal radiation mode is important especially for heat flux on the walls. Both the Discrete Transfer Radiation and P-1 radiation models predict temperature distribution reasonably well, although the latter involves a relatively high computational cost. The P-1 model overestimates heat flux on the walls.

تازه های تحقیق

در مقاله حاضر، به تحلیل عددی سه بعدی جریان واکنشی، چرخشی و دیفیوژنی متان و هوا در محفظه­ی احتراق مدل یک توربین گاز مبتنی بر روش حجم محدود برای بررسی عملکرد دو مدل تشعشعی متداول، مدل انتقال مجزا (DTRM) و مدل تشعشعی P-1  پرداخته شده است. از مدل تنش­های رینولدز (RSM) برای پیش­بینی جریانات آشفته و از مدل اضمحلال گردابه­ (EDM) برای بررسی واکنش جریان بهره گرفته شده است. روش بالادست مرتبه دوم برای گسسته سازی جمله­های جا به جایی تمام معادلات ترابری به کار رفته است. الگوی سیمپلسی برای کوپل کردت جمله­های فشار و سرعت به کار رفته است. میانگین وزنی گازهای خاکستری (WSGGM) برای محاسبه­ی خواص تشعشعی گازها استفاده شده است. نتایج عددی حاصل، در حالت اعمال انتقال گرمای تشعشعی و هم­چنین بدون انتقال گرمای تشعشعی با نتایج تجربی معتبر موجود مورد مقایسه قرار گرفته و عملکرد دو مدل تشعشعی ذکر شده از دیدگاه قابلیت­های محاسباتی و هم­چنین دقت شبیه سازی ارزیابی شده است. مقایسه­ی نتایج عددی، اهمیت نقش مدل­های تشعشع را به ویژه در رابطه با محاسبه شار گرمایی وارد بر دیواره نشان می­دهد. هر دو مدل تشعشعی انتقال مجزا و  مدل P-1 در پیش­بینی دمای گازهای درون محفظه، نتایج مشابهی را ارائه می­دهند. اگر چه مدل انتقال مجزا زمان محاسباتی بسیار بیش­تری نیاز دارد. مدل تشعشعی P-1  شار گرمایی وارد بر دیواره را بیش از میزان حقیقی پیش­بینی می­کند.

کلیدواژه‌ها
Reactive swirling flow
Eddy dissipation model
Reynolds stress model
Radiation Model

عنوان مقاله English

Influence of Thermal Radiation Models on Prediction of Reactive Swirling Methane/Air Flame in a Model Gas Turbine Combustor

نویسندگان English

Farzad Bazdidi Tehrani 1
Hamed Zeinivand 2
1 School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
2 Aerospace Organization, Tehran, Iran
چکیده English

A numerical simulation of reactive swirling methane/air non-premixed flame in a new three-dimensional model combustion chamber is carried out to assess the performance of two thermal radiation models, namely, the Discrete Transfer Radiation Model and the P-1 Model. A Finite Volume staggered grid approach is employed to solve the governing equations. The second-order upwind scheme is applied for the space derivatives of the advection terms in all transport equations. The SIMPLEC algorithm is used to handle the velocity and pressure coupling. The eddy dissipation model is employed to predict the heat release and the Reynolds stress turbulence model is applied to simulate the flow behavior. A weighted-sum-of-gray-gases model is used for the gas radiative properties. Computational results with and without the radiation effects are compared with the available experimental data and the two radiation models are evaluated in terms of computational efficiency and prediction accuracy. Comparison of present numerical results with experimental data reveals that the thermal radiation mode is important especially for heat flux on the walls. Both the Discrete Transfer Radiation and P-1 radiation models predict temperature distribution reasonably well, although the latter involves a relatively high computational cost. The P-1 model overestimates heat flux on the walls.

کلیدواژه‌ها English

: Reactive swirling flow
Eddy dissipation model
Reynolds stress model
Radiation model
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