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Số người truy cập: 107,162,797

 Effect of Ignition Energy and Hydrogen Addition on Laminar
Flame Speed, Ignition Delay Time, and Flame Rising Time of
Lean Methane/Air Mixtures
Tác giả hoặc Nhóm tác giả: Minh Tien Nguyen* , Van Van Luong, Quoc Thai Pham, Minh Tung Phung, Phu Nguu Do
Nơi đăng: Energies 2022; Số: 15, 1940;Từ->đến trang: 1-10;Năm: 2022
Lĩnh vực: Kỹ thuật; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
A series of experiments were performed to investigate the effect of ignition energy (Eig)
and hydrogen addition on the laminar burning velocity (Su0), ignition delay time (tdelay), and flame
rising time (trising) of lean methane-air mixtures. The mixtures at three different equivalence ratios
(f) of 0.6, 0.7, and 0.8 with varying hydrogen volume fractions from 0 to 50% were centrally ignited in
a constant volume combustion chamber by a pair of pin-to-pin electrodes at a spark gap of 2.0 mm. In
situ ignition energy (Eig ∼2.4 mJ ÷ 58 mJ) was calculated by integration of the product of current and
voltage between positive and negative electrodes. The result revealed that the Su0 value increases
non-linearly with increasing hydrogen fraction at three equivalence ratios of 0.6, 0.7, and 0.8, by
which the increasing slope of Su0 changes from gradual to drastic when the hydrogen fraction is
greater than 20%. tdelay and trising decrease quickly with increasing hydrogen fraction; however,
trising drops faster than tdelay at f = 0.6 and 0.7, and the reverse is true at f = 0.8. Furthermore, tdelay
transition is observed when E
ig > Eig,critical, by which tdelay drastically drops in the pre-transition and
gradually decreases in the post-transition. These results may be relevant to spark ignition engines
operated under lean-burn conditions.
ABSTRACT
A series of experiments were performed to investigate the effect of ignition energy (Eig)
and hydrogen addition on the laminar burning velocity (Su0), ignition delay time (tdelay), and flame
rising time (trising) of lean methane-air mixtures. The mixtures at three different equivalence ratios
(f) of 0.6, 0.7, and 0.8 with varying hydrogen volume fractions from 0 to 50% were centrally ignited in
a constant volume combustion chamber by a pair of pin-to-pin electrodes at a spark gap of 2.0 mm. In
situ ignition energy (Eig ∼2.4 mJ ÷ 58 mJ) was calculated by integration of the product of current and
voltage between positive and negative electrodes. The result revealed that the Su0 value increases
non-linearly with increasing hydrogen fraction at three equivalence ratios of 0.6, 0.7, and 0.8, by
which the increasing slope of Su0 changes from gradual to drastic when the hydrogen fraction is
greater than 20%. tdelay and trising decrease quickly with increasing hydrogen fraction; however,
trising drops faster than tdelay at f = 0.6 and 0.7, and the reverse is true at f = 0.8. Furthermore, tdelay
transition is observed when E
ig > Eig,critical, by which tdelay drastically drops in the pre-transition and
gradually decreases in the post-transition. These results may be relevant to spark ignition engines
operated under lean-burn conditions.
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