Experimental study and chemical analysis of n-heptane homogeneous charge compression ignition combustion with port injection of reaction inhibitors

Lü, Xingcai; Ji, Libin; Zu, Linlin; Yu-chun, Hou; Huang, Cheng Liang; Huang, Zhen

doi:10.1016/j.combustflame.2007.01.002

Cited by 92 publications

(28 citation statements)

References 7 publications

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“…Lü vd. [44], HCCI yanmasını yavaşlatmak için n-heptan yakıtına etanol, metanol, izopropanol ve metil tert-bütil eter ilave ederek yanma analizi yapmışlardır. Deneysel çalışma sonucunda metanol yakıtı kullanımı ile diğer yakıtlara göre yanmanın daha fazla yavaşladığı, yanma süresinin uzadığı tespit edilmiştir.…”

Section: Gi̇ri̇ş (Introduction)unclassified

İzopropanol ve Heptan Karışım Yakıtları Kullanımının Bir HCCI Motorda Performans Yanma ve Emisyon Karakteristiklerinin Deneysel İncelenmesi

Calam

Aydoğan

2019

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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In this study, the effect of isopropanol on combustion and exhaust emissions was investigated experimentally in a single cylinder HCCI engine with port injection system. The experiments were carried out at 1000 min-1 engine speed and 60 o C intake air temperature. Figure A. The schematic view of the test bed. Purpose: In this study, the effects of isopropanol fuel on HCCI combustion were investigated. For this purpose, a mixture with the reference fuel (n-heptane) was provided. Combustion, performance and exhaust emissions were investigated. Theory and Methods: The experiments were carried out at 1000 min-1 engine speed and 60 o C intake air temperature. Fuel mixtures were delivered to the intake port by using the port injection system. The amount of fuel to be injected was adjusted by pulse width of the injector that was controlled by the potentiometer on the control panel. The injection was controlled electronically and air/fuel ratio was kept constant. Results: Isopropanol fuel enabled the HCCI combustion to be controlled. However, CO and HC emissions deteriorated by using the isopropanol. Conclusion: The effect of isopropanol on combustion and exhaust emissions was investigated experimentally in a single cylinder HCCI engine with port injection system. The maximum indicated thermal efficiency was obtained as 43.27 % at 2.4 lambda with ip25 fuel. The use of ip25 and ip50 fuels compared to n-heptane, the CO emissions worsened by 22.7% and 62.1%, respectively. However, HC emissions increased by 8.8% and 12%, respectively. The addition of isopropanol to the n-heptane fuel resulted in reduced pressure rise rate. Thus, spontaneous HCCI combustion is controlled.

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Section: Gi̇ri̇ş (Introduction)unclassified

İzopropanol ve Heptan Karışım Yakıtları Kullanımının Bir HCCI Motorda Performans Yanma ve Emisyon Karakteristiklerinin Deneysel İncelenmesi

Calam

Aydoğan

2019

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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“…Shucheng Xu et al [8] investigated kinetics and mechanisms for reactions of OH with methanol and ethanol at the CCSD (Coupled Cluster with Singles and Doubles) (T)/6-311 + G(3df, 2p)//MP2/6-311 + G(3df, 2p) level of theory. X. Lu et al [9] studied ignition timing in the homogeneous charge compression ignition (HCCI) of n-heptane by port injection of reaction inhibitors and obtained chemical mechanistic information relevant to the ignition behavior. In this paper, we focus on the chemical reaction mechanism of methanol and n-heptane in CHEMKIN and find the cause of the macroscopic spontaneous ignition temperature difference and provide a theoretical basis for the possibility of achieving the cascade spontaneous combustion mode.…”

Section: Introductionmentioning

confidence: 99%

Study on Sensitivity Differences of Critical Spontaneous Ignition Temperature between Alcohol and Hydrocarbon Fuels Based on Reaction Pathway

Liu

Ren

et al. 2019

Energies

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In this article, the critical spontaneous ignition temperature of both hydrocarbon and alcohol fuel was acquired on a constant volume combustion bomb platform by slowly heating the inner charges, and then followed by using the CHEMKIN-PRO software to simulate the auto-ignition-dominated characteristic and parameter sensitivity of the two kinds of fuels. Results revealed that in different conditions, the critical spontaneous ignition temperature of methanol changed dramatically, with a maximum temperature of 50 K, while the counterpart temperature of n-heptane remained an invariable value of 553 K within a large changeable scope of temperature, and only a maximum temperature of 10 K was observed. The maximum difference of spontaneous ignition temperature between methanol and n-heptane reached 270 K. At the same time, a minimum difference of 170 K was obtained as well. The complete reaction of methanol requires 5 steps, involving 6 components and 11 elementary reactions. However, for the comparative part-n-heptane, more than 20 main self-ignition reactions were involved, which indicated that the whole reaction process of n-heptane has more reaction pathway branches and it was much more complicated compared to methanol. The differences of the reaction pathways triggered a considerable distinction of critical self-ignition temperature between the two charges, making a “step-by-step” spontaneous ignition combustion mode possible. In this way, a further high-efficient and clean combustion can be available to cater to much more stringent emission regulations in the future.

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“…1,2 However, the ignition and combustion of HCCI combustion are dominated by chemical kinetics and lack direct control for combustion timing. [3][4][5] Thus, these engines have a few disadvantages, such as limited engine operational range due to engine knock and misfire and significantly higher CO and HC emissions under low engine loads. 6,7 To overcome these obstacles, new combustion modes based on recently advanced combustion techniques and fuel supply strategies have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on partially premixed compression ignition combustion fueled with a low octane number primary reference fuel using two-stage fuel supplying

Wang

Huang

et al. 2015

International Journal of Engine Research

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An experimental study of partially premixed compression ignition combustion with low octane fuel was conducted on a single-cylinder engine. The effects of the external exhaust gas recirculation and intake boost on this partially premixed compression ignition combustion and emissions were investigated. During the experiments, a trade-off relationship between the NO x and smoke emissions was observed in this partially premixed compression ignition combustion. However, heavy exhaust gas recirculation usage has the potential to decrease NO x and soot emissions simultaneously at the expense of the fuel economy. It is determined that at an increased intake port pressure, the maximum in-cylinder pressure increases, and the ignition timing of the high-temperature combustion is retarded. Also, the peak value of the low-temperature combustion is slightly depressed, the peak value of the high-temperature heat release decreases significantly, and the maximum value of the diffusing burn increases to some extent. Compared to natural aspirated condition, the partially premixed compression ignition combustion with intake boost has the capability of simultaneously reducing NO x and soot emissions to ultra-low levels, that is, the intake boost could be an important strategy for the combustion and emission improvement in this advanced engine combustion mode.

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Experimental study and chemical analysis of n-heptane homogeneous charge compression ignition combustion with port injection of reaction inhibitors

Cited by 92 publications

References 7 publications

İzopropanol ve Heptan Karışım Yakıtları Kullanımının Bir HCCI Motorda Performans Yanma ve Emisyon Karakteristiklerinin Deneysel İncelenmesi

İzopropanol ve Heptan Karışım Yakıtları Kullanımının Bir HCCI Motorda Performans Yanma ve Emisyon Karakteristiklerinin Deneysel İncelenmesi

Study on Sensitivity Differences of Critical Spontaneous Ignition Temperature between Alcohol and Hydrocarbon Fuels Based on Reaction Pathway

Experimental study on partially premixed compression ignition combustion fueled with a low octane number primary reference fuel using two-stage fuel supplying

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