بررسی اثر سینتیک شیمیایی و مدل احتراقی بر تابع پاسخ شعله (FTF) یک توربین گاز پیش مخلوط رقیق سوز با استفاده از شبیه سازی LES

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه خواجه نصیرالدین طوسی، دانشکده هوافضا، آزمایشگاه پژوهشی احتراق و پیشرانش، تهران، ایران

2 دانشگاه خواجه نصیرالدین طوسی، دانشکده هوافضا، آزمایشگاه پژوهشی احتراق و پیشرانش، تهران،

10.22034/jfnc.2022.320662.1297

چکیده

یکی از روش­ های بررسی ناپایداری احتراق، شبیه­ سازی پاسخ شعله نسبت به نوسان­ های آکوستیکی است. در تحقیق حاضر به­ منظور مدل­ سازی نوسان­های آکوستیکی، از روش تهییج مصنوعی «سرعت هارمونیک تک فرکانس» در راستای طولی استفاده شده است. بررسی اثر این نوسان بر شعله، با حل عددی LES و در قالب تابع پاسخ شعله (FTF) بیان می شود که سینتیک شیمیایی و مدل احتراقی، اثر به­ سزایی در تعیین این تابع دارند. نتایج شبیه­ سازی احتراق برای شعله پیش مخلوط متان نشان داد با اینکه مدل احتراقی EDC  همراه با سینتیک شیمیایی 17 جزئی و 73 واکنش نسبت به مدل احتراقی TF همراه با سینتیک شیمیایی 6 جزئی و 2 واکنش، 2 برابر هزینه محاسباتی بالاتری دارد، اما خطای حل عددی برای محاسبه تابع FTF را تا زیر 5 درصد کاهش می­ دهد. پس از شبیه­ سازی بر اساس تبدیل سریع فوریه از FTF، دامنه و فاز این تابع محاسبه می­ شود که دامنه FTF دو مقدار بیشینه در20-30 هرتز و 170 هرتز و یک نقطه کمینه در 80-110 هرتز را نشان می­دهد. ناپایداری احتراق از طریق حل معادله آکوستیک (هلمهولتز) و جایگذاری دامنه و فاز تابع FTF به­عنوان ترم آزادسازی حرارت در این معادله قابل بررسی است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of the Effect of Chemical Kinetics and Combustion Model on the Flame Transfer Function of a Diluent Premixed Gas Turbine Using LES

نویسندگان [English]

  • ehsan behzad 1
  • reza ebrahimi 2
1 Khajeh Nasiredine Toosi University of Technology, Department of Aerospace Engineering, Combustion and Propulsion Research Laboratory, Tehran, Iran
2 Khajeh Nasiredine Toosi University of Technology, Department of Aerospace Engineering, Combustion and Propulsion Research Laboratory, Tehran, Iran
چکیده [English]

One of the methods of investigating combustion instability is to simulate the flame response to acoustic oscillations. In the present study, in order to model the acoustic oscillations, the artificial excitation method "single frequency harmonic velocity" in the longitudinal direction has been used. The effect of this oscillation on the flame is expressed by numerical solution of LES in the form of flame transfer function (FTF) that chemical kinetics and combustion model have a great effect on determining this function. The combustion simulation results for methane premixed flame showed that although the 17-component EDC combustion model has twice the computational cost compared to the 6-component TF combustion model, it reduces the numerical solution error for calculating the FTF function to less than 5%. After simulation by using Fourier transform of FTF, the amplitude and phase are calculated. The FTF amplitude shows two maximum values at 30-20 Hz and 170 Hz and a minimum point at 80-110 Hz. Combustion instability can be investigated by solving the acoustic equation (Helmholtz) and placing the amplitude and phase of the FTF function as the heat release term in this equation.
 

کلیدواژه‌ها [English]

  • Combustion instability
  • Flame transfer function
  • chemical kinetics
  • Combustion model
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