4.7 Article

Self-excited instability regimes of a confined turbulent jet flame at elevated pressure

期刊

PHYSICS OF FLUIDS
卷 34, 期 4, 页码 -

出版社

AIP Publishing
DOI: 10.1063/5.0083293

关键词

-

资金

  1. DURIP Grant [FA9550-16-1-0534]

向作者/读者索取更多资源

The dynamic response of a confined, premixed turbulent jet flame is investigated at high thermal power densities and turbulence levels. Multiple instability modes were observed, and high-frequency combustion instabilities were found to be associated with the azimuthal hydrodynamic mode of the reactant jet.
The dynamic response of a confined, premixed turbulent jet flame is investigated at high thermal power densities (similar to 25 MW/m(2)/bar) and turbulence levels (Re-jet similar to 5 x 10(5)). As equivalence ratio and inlet jet velocity are varied at these conditions, multiple instability modes coexist: a low-amplitude instability (p'/p(c) less than or similar to 9%) with longitudinal-mode fluctuations (1L and 2L) and two high-amplitude (p'/p(c) less than or similar to 20%), high-frequency, transverse instability modes. While the axial modes are ubiquitous across the operational envelope, the transverse mode selection is sensitive to the equivalence ratio and reactant jet velocity. A linear stability analysis (ISA) of the confined base flow is performed to explore the flame perturbation in response to the density and temperature gradients, and the shear-layer instabilities in the flow. The high-frequency combustion instabilities are associated with a combined azimuthal hydrodynamic mode of the reactant jet, (1) at the combustion chamber near field and, (2) downstream in the fully developed region of the combustor. An excellent agreement was observed between the convectively unstable modes identified by the temporal LSA and the self-excited combustion instabilities in the experiment. Published under an exclusive license by AIP Publishing.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据