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 A Minimum Ignition Energy Transition on Spark Ignition of Lean Iso-octane/Air Mixture at 373 K
Tác giả hoặc Nhóm tác giả: L.J.Jang, M.T.Nguyen, S.Y.Huang, S.S.Shy*
Nơi đăng: 13th International Conference on Combustion & Energy Ultilization; Số: 2016;Từ->đến trang: 34;Năm: 2016
Lĩnh vực: Kỹ thuật; Loại: Báo cáo; Thể loại: Quốc tế

This paper reports turbulent spark ignition and minimum ignition energy (MIE) of lean iso-octane/air mixtures at an equivalence ratio ϕ = 0.8 at 373 K using a large dual-chamber, constant-pressure, constant-temperature, fan-stirred 3D cruciform burner. The burner equipped with a pair of counter-rotating fans and perforated plates is capable of generating near-isotropic turbulence in the central region between two perforated plates over a wide range of turbulent intensities (u′/SL), where SL is the laminar burning velocity. The constant temperature in the domain of experimentation is controlled by the two newly-modified heating devices, i.e. (1) a surface heater device consisted of many pieces having 17 kW in total that is installed around the outer surfaces of the 3D cruciform burner and (2) a perforated plate heater device, where a long narrow serpentine heating strip of a cross sectional area of 2.5 x 2.5 mm2 is carefully welded on each of the two perforated plates without blocking any of these 10 mm holes and thus the same turbulence properties can be retained. Spark discharges having nearly square voltage and current wave forms are carefully generated for accurate determination of the spark discharged energy (Eig). MIE is a probabilistic variable that must be determined statistically by repeating many ignition experiments under the same conditions except using a range of different Eig in order to identify a transition band in which successful ignition (Go) and misfire (No go) coexist even at the same Eig. Thus, MIE is defined as the 50% successful ignitability. It is found that the increasing slopes of MIET/MIEL = Г versus u′/SL change abruptly from linearly to exponentially when u′/SL > (u′/SL)c ≈ 5 showing MIE transition similar to that found in gaseous methane/air mixtures, where the subscripts T and L represent turbulent and laminar properties with MIEL ≈ 5.56 mJ. For the pretransition, Г ~ (u′/SL) 0.88, whereas Г ~ (u′/SL) 2.73 for the post-transition. More MIE measurements of iso-octane, n-heptane, toluene, and real gasoline are currently conducting to enhance our understanding on ignition characteristics of liquid fuels that are important for the further development of auto and aviation engines.
[ 2016\2016m010d011_10_7_41MIE_Paper.pdf ]
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