A study on the influence of ignition energy on ignition delay time and laminar burning velocity of lean methane/air mixture in a constant volume combustion chamber
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Từ khóa:
Laminar burning velocity
Ignition delay time
Lean methane/air mixture
Minimum reliable ignition energy
Constant volume combustion chamber
Tóm tắt
This study presents the effect of ignition energy (Eig) on ignition delay time (tdelay) and uncertainty of laminar burning velocity (Su0) measurement of lean methane/air mixture in a constant volume combustion chamber. The mixture at an equivalence ratio of 0.6 is ignited using a pair of electrodes at the 2-mm spark gap. Eig is measured by integrating the product of voltage V(t) and current I(t) signals during a discharge period. The in-chamber pressure profiles are analyzed using the pressure-rise method to obtain tdelay and Su0. Su0 approximates 8.0 cm/s. Furthermore, the increasing Eig could shorten tdelay, leading to a faster combustion process. However, when Eig is greater than a critical value, called minimum reliable ignition energy (MRIE), the additional elevating Eig has the marginal effect on tdelay and Su0. The existence of MRIE supports to optimize the ignition systems and partly explains why extreme-high Eig>> MRIE has less contribution to engine performance.
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Nguyen Minh Tien, Nguyen Le Chau Thanh, Ho Hong Phi, Nguyen Van Dong. “A Study on the Influence of Ignition Energy on Ignition Delay Time and Laminar Burning Velocity of Lean methane/Air Mixture in a Constant Volume Combustion Chamber”. Tạp Chí Khoa học Và Công nghệ - Đại học Đà Nẵng, vol 19, số p.h 12.2, Tháng Chạp 2021, tr 1-4, doi:10.31130/ud-jst2021-009E.
