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利用快速压缩装置进行了点火位置对天然气直喷超稀燃烧的基础性研究。研究结果表明:对于给定的当量比来说,存在一个最佳点火位置,在此位置点火时可以获得最短的燃烧持续期、最大的压力升高值、最高的燃烧效率、最快的燃烧放热率和最低的CO和未燃碳氢排放。最佳点火位置随当量比的减小而移向喷油嘴出口位置。当点火位置靠近喷油嘴出口位置时,稀燃极限可以延伸到更小的当量比,但可着火的当量比的范围变得狭窄。当量比大于0.1时,燃烧效率将维持在较高的数值;当量比小于0.1时,因未燃燃油所占的比例增加,燃烧效率明显降低。
The basic research on the direct injection ultra-lean combustion of natural gas at the ignition position was carried out by using a rapid compression device. The results show that for a given equivalence ratio there is an optimum ignition position at which the shortest burning duration, the maximum pressure rise, the highest combustion efficiency, the fastest burning rate Heat rate and lowest CO and unburned hydrocarbon emissions. The best ignition position with the equivalence ratio decreases toward the nozzle outlet position. When the ignition position is near the nozzle outlet, the lean burn limit can be extended to a smaller equivalence ratio, but the range of equivalence ratios for ignitable ignition becomes narrower. When the equivalence ratio is more than 0.1, the combustion efficiency will be maintained at a high value. When the equivalence ratio is less than 0.1, the combustion efficiency will be significantly reduced due to an increase in the proportion of unburned fuel.