収束デトネーションを用いたガスエンジン用点火システムに関する研究(熱工学,内燃機関,動力など)

概要

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In the present work performance of a novel ignition system based on imploding detonation was studied in order to improve ignition ability and combustion enhancement of gas engines using a natural gas for power generation. Deflagration generated in the pre-chamber was introduced into the imploding chamber whose cross-sectional area decreases in the propagation direction and then transition to detonation occurs. Flame jet emanating from a nozzle fixed at the implosion center is expected to have superior ignition ability due to high temperature and pressure inherent to imploding detonations. The experimental results show that maximum pressure at the implosion center was 300 to 350 times higher than the initial pressure. The burning time in the main combustion chamber of 350 mm in diameter ranged from 2.5 ms to 4 ms and decreased with increase in the nozzle diameter under the condition that the nozzle orifice was choked. From the estimation of burning velocity and cell size of a stoichiometric methane-air mixture under the gas engine condition, it was requested that the nozzle diameter must be larger than 4.0mm and that the volumetric ratio of the pre-combustion chamber to the main combustion chamber is less than 0.01, in order to detonate the mixture in the pre-combustion chamber more easily with comparison to the present test.
2008-05-25