CAJ | 학술논문

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.
이용쾌속압축장치진행료점화위치대천연기직분초희연소적기출성연구.연구결과표명:대우급정적당량비래설,존재일개최가점화위치,재차위치점화시가이획득최단적연소지속기、최대적압력승고치、최고적연소효솔、최쾌적연소방열솔화최저적CO화미연탄경배방.최가점화위치수당량비적감소이이향분유취출구위치.당점화위치고근분유취출구위치시,희연겁한가이연신도경소적당량비,단가착화적당량비적범위변득협착.당량비대우0.1시,연소효솔장유지재교고적수치;당량비소우0.1시,인미연연유소점적비례증가,연소효솔명현강저.
A basic study on the ignition position to natural gas direct injection super-lean combustion was studied by using a rapid compression machine. The results show that the optimum spark electrode gap position exists for a specified equivalence ratio where it gives short combustion duration, high value of pressure rise, high combustion efficiency, rapid heat release rate, low concentration of CO and unburned hydrocarbon. The optimum spark electrode gap position will be close to the injector tip with the decreasing of equivalence ratio. Lean burn limit can be extended to even smaller equivalence ratio with closing the spark electrode gap to the injector tip whereas the range of equivalence ratios for the flammability becomes narrow with closing the spark electrode gap to the injector tip. High combustion efficiency can be maintained at the equivalence ratio φ≥0.1 and decreases remarkably at φ＜0.1 due to increasing the ratio of unburned fuel to the injected fuel.