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| 1 | An experimental study on spray auto-ignition of RP-3 jet fuel and its surrogates显示文摘Jet fuel is widely used in air transportation,and sometimes for special vehicles in ground transportation.In the latter case,fuel spray auto-ignition behavior is an important index for engine operation reliability.Surrogate fuel is usually used for fundamental combustion study due to the complex composition of practical fuels.As for jet fuels,two-component or three-component surrogate is usually selected to emulate practical fuels.The spray auto-ignition characteristics of RP-3 jet fuel and its three surrogates,the 70%mol n-decane/30%mol 1,2,4-trimethylbenzene blend(Surrogate 1),the 51%mol n-decane/49%mol 1,2,4-trimethylbenzene blend(Surrogate 2),and the 49.8%mol n-dodecane/21.6%mol iso-cetane/28.6%mol toluene blend(Surrogate 3)were studied in a heated constant volume combustion chamber.Surrogate 1 and Surrogate 2 possess the same components,but their blending percentages are different,as the two surrogates were designed to capture the H/C ratio(Surrogate 1)and DCN(Surrogate 2)of RP-3 jet fuel,respectively.Surrogate 3 could emulate more physiochemical properties of RP-3 jet fuel,including molecular weight,H/C ratio and DCN.Experimental results indicate that Surrogate 1 overestimates the auto-ignition propensity of RP-3 jet fuel,whereas Surrogates 2 and 3 show quite similar auto-ignition propensity with RP-3 jet fuel.Therefore,to capture the spray auto-ignition behaviors,DCN is the most important parameter to match when designing the surrogate formulation.However,as the ambient temperature changes,the surrogates matching DCN may still show some differences from the RP-3 jet fuel,e.g.,the first-stage heat release influenced by low-temperature chemistry. | Yaozong DUAN Wang LIU Zhen HUANG Dong HAN | 2021 | Frontiers in Energy2021，15，2： | 2 |
| 2 | 湍流射流点火对天然气发动机燃烧特性影响的试验研究显示文摘基于一台带有预燃室的点燃式单缸试验机,开展了湍流射流点火(turbulent jet ignition,TJI)模式下天然气发动机性能的试验研究。首先,研究了不同过量空气系数下TJI对天然气发动机动力性能、排放及燃烧特性的影响,并与火花塞点火(spark ignition,SI)模式进行对比;其次,在稀燃条件下分别探究了进气增压和预燃室喷氢对天然气发动机性能的优化作用。结果表明:TJI的使用可有效拓展天然气发动机的稀燃极限,且燃烧滞燃期和燃烧持续期均更短,放热率更高;过量空气系数1.5为甲烷TJI最佳稀燃工况,此时燃油消耗率最低,且可实现NO_(x)近零排放;此外,采用进气增压的方式可以提高TJI发动机在高负荷下的经济性;TJI模式下,相较于预燃室喷甲烷,预燃室喷氢气可进一步缩短滞燃期和燃烧持续期,提高放热率,达到提升TJI性能的效果。 | 车胜楠 冯钟辉 刘宗宽 周磊 卫海桥 刘昌文 | 2021 | 内燃机工程2021，42，6： | 1 |
| 3 | 高低辛烷值燃料对双喷发动机燃烧和排放的影响显示文摘随着近些年愈加严格的排放标准相应实施,对汽油机的排放和油耗都有很严格的限制。目前已有大量新技术用以改善直喷汽油机的燃烧和排放,但大部分的技术应用需要对发动机内部进行优化,因此需要对发动机的机械结构进行大量的改动。在不改变原始燃烧室的基础上,在一台缸内直喷汽油机上搭建双喷射系统,通过进气道喷射高辛烷值燃料直喷低辛烷值燃料的方式,研究低辛烷值燃料比例对于双喷射发动机燃烧和排放的影响。实验结果表明,合适的低辛烷值燃料比例可以改善燃烧并降低油耗,在不同负荷下油耗分别降低4.81%、4.88%和2.23%。同时因为双喷射的应用使得颗粒物排放也能维持在较低水平,不同负荷下颗粒物数量的降低幅度分别为99.96%、99.65%和98.87%。 | 夏淳 赵廷钰 方俊华 朱磊 黄震 | 2022 | 小型内燃机与车辆技术2022，51，2： | 0 |
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