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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 | An experimental and modeling study on polyoxymethylene dimethyl ether 3(PODE_(3))oxidation in a jet stirred reactor显示文摘Polyoxymethylene dimethyl ether(PODE n,n≥1)is a class of oxygenated fuels containing unique carbon-oxygen chain structure and a promising alternative fuel for diesel engines.In this study,low-temperature oxidation characteristics of PODE_(3) were studied experimentally and numerically.Experiments were performed in a jet-stirred reactor(JSR)at equivalence ratios of 0.5,1.0 and 2.0,in the temperature range of 500 to 950 K,and at atmospheric pressure.Mole fractions of PODE_(3),O_(2),H_(2),CO,CO_(2),CH_(3) OH and C_(1)-C_(2) hydrocarbons were measured by gas chromatograph(GC).Experimental measurements were compared with the simulation results based on two literature low-temperature oxidation models,denoted as the He model and the Cai model,respectively.Good agreement was obtained between the measured and simulated fuel consumption profiles,while a deviation was observed between the experimental and simulation results on the mole fractions of O_(2) and intermediate products at medium temperatures.Reaction pathway analyses based on the two models were performed,revealing that the second O_(2)-addition reaction pathway is more significant in the prediction by the Cai model than that by the He model.Sensitivity analyses pointed out that the most important reactions affecting fuel consumption are the H-abstraction reactions of PODE_(3),and the decomposition of H_(2) O_(2) and the consumption of CH_(2)O become more sensitive at medium temperatures. | Zeyan Qiu Anhao Zhong Zhen Huang Dong Han | 2022 | Fundamental Research2022，2，5： | 1 |
| 3 | Effects of Magnetic Fields on Morphology and Nanostructure Evolution of Incipient Soot Particles from n-heptane/2,5-dimethylfuran Inverse Diffusion Flames显示文摘Differences of the morphology and nanostructure evolution of incipient soot particles generated in n-heptane/2,5-dimethylfuran(DMF)inverse diffusion flames(IDFs)with/without magnetic fields were investigated.Utilizing a high resolution transmission electron spectroscopy,the morphology and nanostructures of soot sampled from spatial locations at different heights in IDFs were analyzed.The graphitization and the oxidation reactivity of soot were tested by an X-ray diffraction and a thermogravimetric analyzer,respectively.Results demonstrated that the magnetic force on paramagnetic species,such as oxygen molecules,can modify the soot formation and oxidation.More incipient soot particles with larger diameters appeared in chains or branches or tufted forms on the flame wing region and the higher position than that on the flame centerline region and the lower position.With magnetic fields,greater amounts of clustered soot particles displayed more crowded distribution and larger diameters.Soot particles with typical structures of the core-shell were promoted to own more orderly bordered lamellae with longer fringe length and smaller fringe tortuosity by the magnetic force acting on oxygen at the same sample position.These modifications resulted in relatively larger diffraction angle of the peak,higher graphitization degree and slightly lower oxidation reactivity of soot. | JIANG Bo WANG Pengfei LIU Dong | 2020 | Journal of Thermal Science2020，29，3： | 1 |
| 4 | 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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