Cold-State Investigation on a Flame Holder

• 作者: Yiqing Du
• 来源期刊: 电力能源(英文)
• 学科: 物理学
• 关键词: FLAME HOLDER Bluff Body FLAME Stability COHERENT Structure VORTEX SHEDDING
• 年，卷（期）: 2013,（7）
• 页码范围: 45-50
• 页数: 6页
• 分类号: O3

摘要

Slitty bluff body is widely used as a high-performance flame holder in power industry. To understand the flame stability mechanism, the evolution of the near wake over a slitty bluff body in cold state was numerically investigated using the renormalization group (RNG) k-ε model at Reynolds number of 470,000. The coherent structure of the near wake was identified by the vortex shedding simulation. To explain the vortex shedding, a mechanism that single vortex of large size suddenly immerses two shear layers was proposed. To quantitatively compare the near wakes at different gap ratio, a vortex shedding character dimension was first proposed. This character dimension has positive correlation with flame stability. Particle-image velocimetry (PIV) measurements in a close wind tunnel were also carried out to confirm the observation from the numerical study. The evidence shows that the numerical results are of good agreement with the cold-state experiments.