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پایان نامه با موضوعInvestigation of Plasma Assisted Combustion in an Internal Combustion Engineدر سطح ارشد دانشگاهOttawa-Carleton Institute for Mechanical and Aerospace Engineeringسال2012خلاصه This research evaluates the effect on combustion cylinder pressure due to ignition from a 30kHz plasma ignition device, coupled with an arc discharge, in an internal combustion engine. The work includes outfitting an internal combustion engine with an optical encoder for refined timing control, and sensors for monitoring internal cylinder pressure and other engine parameters. Capturing and analyzing the collected data was performed by using multiple National Instruments data acquisition boards and mathematical evaluation software such as MATLAB. For each set of experimental parameters, over 1000 pressure curves were collected and a statistical analysis was conducted on the datasets. The experiments were motivated by a hypothesis of the ignition system developer that the use of plasma at the ignition site results in the formation of radicals, which are expected to change the ignition delay time and flame propagation characteristics. The experimental results show that the plasma ignition device creates two plasma states, one postulated to be in a streamer discharge state and the other in a glow discharge state. It was postulated by the industrial partner that an improvement of 4% to 9% in engine performance is possible through use of the spatial plasma discharge ignition device, however the experiment designed here provided a peak errorof 14.4% which is beyond the expected difference seen. However recommendations for improvement upon these errors (systematic and random) are discussed. The results from the engine experiments show that the number of voltage pulses and the amount of current induced during each pulse has no effect on the pressure traces to within the experimental uncertainty of the apparatus. However, the comparison of the plasma discharge ignition system to an inductive discharge (ID) unit shows that for engine loads of 60%, the peak cylinder pressure increases with breakdown current, and thus the conventional inductive discharge system creates higher cylinder pressures compared to the spatial plasma discharge ignition (SPDI) device under investigation. However, the mass fraction burn analyses conducted on these results show that the difference in combustion rates and ignition delay times are within the experimental uncertainty and are therefore not statistically significant.
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تاریخ انتشار : چهار شنبه 9 دی 1395 |
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