Effect of hydrogen addition on the variations of heat release rate in a t urbulent stratified swirl methane-air flame
سال انتشار: 1401
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 143
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شناسه ملی سند علمی:
ISME30_179
تاریخ نمایه سازی: 29 خرداد 1401
چکیده مقاله:
Three-dimensional RANS simulations with reduced mechanism were performed to investigate the effect of hydrogen addition on the heat release rate (HRR) spatial variations in premixed and stratified cases of a t urbulent stratified swirl methane-air flame. k-ω SST turbulent model and PaSR combustion model were used while considering the differential diffusion with different Schmidt numbers. Variations in the combustion intensity in a globally lean and turbulent flame were studied with ۴۰% hydrogen addition (on the volume of fuel basis) to the fuel and compared to the reference methane-air combustion under two operational conditions: fully premixed and stratified. Results reveal that H۲ addition increases HRR in both stratified and premixed cases compared to pure methane combustion; however, the peak HRR in stratified case occurs in upstream locations (near the burner exit) which, can be related to higher burning velocity in stratified case. Also, while adding H۲, HRR profiles move outward, especially in downstream locations showing that the flame expands radially. All in all, stratification intensifies the changes in temperature, local equivalence ratio, and HRR.
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نویسندگان
Sajjad Rahimi
MSc student, Mechanical engineering, Tarbiat Modares University, Tehran, Iran,
Kiumars Mazaheri
Professor, Mechanical engineering, Tarbiat Modares University, Tehran, Iran,
Alireza Alipoor
Assistant professor, Mechanical engineering, Shiraz University, Shiraz, Iran,
Amirreza Mohammadpour
Phd candidate, Mechanical engineering, Tarbiat Modares University, Tehran, Iran,