بررسی ناپایداری احتراق در مشعل جریان همسو سوخت و هوا

حلمی, حامد; بخشان, یونس; ادیبی, پویان

doi:10.48311/mme.2026.119168.82984

بررسی ناپایداری احتراق در مشعل جریان همسو سوخت و هوا

نوع مقاله : مقاله پژوهشی

نویسندگان

حامد حلمی

یونس بخشان

پویان ادیبی

گروه مهندسی مکانیک، دانشگاه هرمزگان، بندرعباس، ایران

10.48311/mme.2026.119168.82984

چکیده

این مطالعه، مدل جبهه واکنش همدوس چندمقیاسی (MSRC) را معرفی می‌کند، یک چارچوب پیش‌بینی‌کننده برای تحلیل ناپایداری‌های هیدرودینامیکی و ترموآکوستیک در مشعل‌های سوخت-هوای جریان همسو بطوریکه مدل MSRC، دینامیک غیرخطی گینزبورگ-لاندائو را با کوپلینگ آکوستیک و شبیه‌سازی گردابه‌های بزرگ (LES) ادغام می‌کند. اعتبارسنجی مدل با داده‌های تجربی مشعل دانشگاه آلبرتا (شامل ساختار شعله، دما، غلظت گونه‌ها، نوسانات سرعت و گردابه، و انتشار آلاینده‌ها) انجام شده است و دقت آن را تأیید می‌کند. چارچوب MSRC گذارهای پیچیده از احتراق پایدار به نوسانات چرخه‌ای محدود (LCO) و رفتار آشوبناک را ثبت می‌کند. تحلیل نوسانات سرعت و گردابه، ساختارهای همدوس با فرکانس پایین (<200 Hz) را در نازل نشان می‌دهد که با مدهای آکوستیک سیستم همبستگی دارند و ناپایداری لایه برشی را تأیید می‌کنند. مدل همچنین ناپایداری‌های لایه برشی فرکانس بالا (در اعداد رینولدز بالا) را از کوپلینگ ترموآکوستیک متمایز می‌کند. در نهایت، نشان داده می‌شود که بهینه‌سازی جریان هوای همسو می‌تواند احتراق را تثبیت کرده و انتشار آلاینده‌ها را کاهش دهد. این نتایج، ابزاری ارزشمند برای طراحی سیستم‌های احتراق پایدار و کم‌انتشار فراهم می‌کند.

کلیدواژه‌ها

ناپایداری احتراق

مشعل جریان همسو

جریان رقیق‌ساز هوا

گردابه‌های بزرگ

ناپایداری کلوین-هلمهولتز

موضوعات

احتراق

عنوان مقاله English

Investigation of combustion instability in a co-flow burner with fuel and air

نویسندگان English

Hamed Helmi

Younes Bakhshan

Pouyan Adibi

Mechanical Engineering Department, Hormozgan University, Badar abbas, Iran

چکیده English

This paper introduces the multiscale coherent reaction front (MSRC) model, a predictive framework for the analysis of hydrodynamic and thermoacoustic instabilities in co-flow fuel-air burners. The MSRC model integrates nonlinear Ginzburg-Landau dynamics with acoustic coupling and large eddy simulation (LES). Model validation with experimental burner data from the University of Alberta (including flame structure, temperature, species concentration, velocity and vorticity fluctuations, and pollutant emissions) has been performed and confirms its accuracy. The MSRC framework captures complex transitions from stable combustion to limited cyclic oscillations (LCO) and chaotic behavior. Analysis of velocity and vorticity fluctuations reveals low-frequency (<200 Hz) coherent structures in the nozzle that correlate with the acoustic modes of the system and confirm shear layer instability. The model also distinguishes high-frequency shear layer instabilities (at high Reynolds numbers) from thermoacoustic coupling. Finally, it is shown that optimization of the aligned airflow can stabilize combustion and reduce pollutant emissions. These results provide a valuable tool for the design of stable and low-emission combustion systems.

کلیدواژه‌ها English

Combustion instability

co-current burner

steam dilution flow

large eddies

Kelvin-Helmholtz instability

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