High pressure ignition kernel development and minimum ignition energy measurements in different regimes of premixed turbulent combustion

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题名:	High pressure ignition kernel development and minimum ignition energy measurements in different regimes of premixed turbulent combustion
作者:	施聖洋;Peng, Ming-Wei;Shy, Shenqyang (Steven);Shiu, Yao-Wen;Liu, Chien-Chia
贡献者:	工學院機械工程學系
关键词:	Applied sciences;burning;Combustion;Combustion. Flame;Computational fluid dynamics;diffusivity;Energy;Energy. Thermal use of fuels;Exact sciences and technology;Flame kernel development;Fluid dynamics;Fluid flow;High pressure turbulent ignition;Ignition;Ignition transition;image analysis;Kernels;Minimum ignition energy;Reaction zone P�clet number;seeds;statistical analysis;Theoretical studies. Data and constants. Metering;Turbulence;Turbulent flow
日期:	2013-09-01
上传时间:	2026-04-23 15:13:25 (UTC+8)
出版者:	Elsevier Inc.;Amsterdam: Elsevier Inc
摘要:	摘要： A high-pressure, double-chamber explosion facility possessing controllable ignition and turbulence properties is used to measure flame kernel formation and its minimum ignition energy (MIE) of methane–air mixtures at the equivalence ratio ϕ=0.7 with various turbulent intensities (u′/SL) up to 80 covering from flamelet to distributed regimes, where SL is the laminar burning velocity. The facility applies a high-power pulse generator to control ignition energies of a spark-electrode at the centre of a large inner cruciform burner that is lodged in a huge high-pressure outer chamber. The cruciform burner is equipped with a pair of counter-rotating fans and perforated plates capable of generating controllable near-isotropic turbulence. Two statistical methods for MIE determination are discussed. A high speed Schlieren imaging system is applied to see different modes of flame kernel development with island formation and quench. Results show that MIE decreases considerably with increasing pressure (p) at any given u′, while MIE increases with increasing u′ at fixed p. It is found that the increasing slopes of MIET/MIEL=Γ curves with increasing u′/SL change drastically from linear to exponential at different critical values of u′/SL≈22 (1atm) and 60 (3atm) showing MIE transition, where the subscripts T and L represent turbulent and laminar values with MIEL=0.73mJ (1atm) and 0.23mJ (3atm). We introduce a modified reaction zone Péclet number, Pe=PeRZ(p/p0)−1/4 estimated just at the instant of the formation of the flame kernel, indicating the surface diffusivity ratio between turbulence and chemical reaction around the kernel with pressure correction, where p0=0.1MPa. The aforesaid two different sets of Γ vs. u′/SL curves can be thus merged into a single Γ vs. Pe curve having one critical value of Pe* across which MIE transition occurs. A model is proposed in attempt to explain these results. 出版者： Amsterdam: Elsevier Inc 出版日期： 2013-09-01 出處： Combustion and flame, 2013-09, Vol.160 (9), p.1755-1766 版權： 2013 The Combustion Institute. 版權： 2014 INIST-CNRS 識別號： ISSN: 0010-2180 識別號： EISSN: 1556-2921 識別號： DOI: 10.1016/j.combustflame.2013.03.030 識別號： CODEN: CBFMAO
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