دانلود مقاله ISI انگلیسی شماره 109996
ترجمه فارسی عنوان مقاله

تأثیر نوسانات جت خود به خودی خود بر روی یک شعله سر و صدا محدود در نزدیکی انفجار ناب

عنوان انگلیسی
Influence of self-sustained jet oscillation on a confined turbulent flame near lean blow-out
کد مقاله سال انتشار تعداد صفحات مقاله انگلیسی
109996 2017 9 صفحه PDF
منبع

Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)

Journal : Proceedings of the Combustion Institute, Volume 36, Issue 3, 2017, Pages 3773-3781

پیش نمایش مقاله
پیش نمایش مقاله  تأثیر نوسانات جت خود به خودی خود بر روی یک شعله سر و صدا محدود در نزدیکی انفجار ناب

Premixed methane–air turbulent flame is generated in a single-nozzle jet-stabilized combustor designed based on the FLOX® concept1. Confinement-induced, self-sustained jet oscillation is observed. Its influence on combustion stability near lean blow-out (LBO) is investigated using simultaneous particle imaging velocimetry (PIV), planar laser-induced fluorescence of OH radicals (OH PLIF), and OH chemiluminescence imaging at 5-kHz repetition rate. Via proper orthogonal decomposition (POD) of the velocity field and extended POD of the scalar fields, pronounced variations in the flame shape are observed during a cycle of jet oscillation. In extreme cases, flame is partially blown out in the combustor due to jet impingement on the wall during the first half of its oscillation cycle. In the subsequent half cycle following jet detachment, flame is restabilized after robust flashback and re-light. Statistical analysis shows that such pattern is by far the most prevalent mechanism for blow-out and restabilization to take place at the operating condition. Additionally, these events are found with much higher probability during slow-paced jet oscillations.