Analysis of Controlled Auto-Ignition/HCCI Combustion in a Direct Injection Gasoline Engine with Single and Split Fuel Injections

Cao, Li; Zhao, Hua; Jiang, Xi

doi:10.1080/00102200701600903

Cited by 15 publications

(5 citation statements)

References 29 publications

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“…12(a), moving from the baseline case to the SOI2=180-140 CAD BTDC cases, the peak HRR dropped as the combustion duration increased. This is because split injection can reduce the temperature around the spark plug via a cooling effect from the evaporation of local rich fuel (  <1) [42]. Simultaneously, a lean fuel/air mixture is generated (  >1) near the cylinder wall, which prolongs the ignition delay time of the unburned mixture.…”

Section: Combination Of Internal Egr and Split Injection (I-egr And Splmentioning

confidence: 99%

Effects of applying EGR with split injection strategy on combustion performance and knock resistance in a spark assisted compression ignition (SACI) engine

Zhou

Dong

Hua

et al. 2018

Applied Thermal Engineering

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Spark assisted compression ignition (SACI) is a proven method for extending the load range and controlling the combustion phase of homogeneous charge compression ignition (HCCI) while maintaining high thermal efficiency. However, the occurrence of abnormal combustion, such as knock, limits the improvement of efficiency in SACI combustion. In this study, the effects of a coupling strategy, which combines internal/external exhaust gas recirculation (i & e-EGR) and split injection, on knock suppression in SACI mode were investigated in a high-compression-ratio, single-cylinder gasoline engine with a fully variable valve system. During the experiment, the mass of intake air remained constant while e-EGR was added. The results show that the coupling strategy combines the advantages of e-EGR and split injection, providing an effective method for resisting knock and improving engine efficiency. The results also demonstrate that applying e-EGR to SACI combustion significantly decreases the knock intensity by effectively reducing the in-cylinder temperature. In addition, the effect of split injection on knock suppression is related to the initial in-cylinder temperature and fuel stratification. With high initial in-cylinder temperature, the relationship between knock probability and split injection timing is non-monotonic. However, with low initial in-cylinder temperature, the capacity of resisting knock monotonically increases with the delay of secondary injection timing.

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Section: Combination Of Internal Egr and Split Injection (I-egr And Splmentioning

confidence: 99%

Effects of applying EGR with split injection strategy on combustion performance and knock resistance in a spark assisted compression ignition (SACI) engine

Zhou

Dong

Hua

et al. 2018

Applied Thermal Engineering

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show abstract

“…Depending on the oxygen available in the trapped mixture during the recompression stroke, fuel pyrolysis or/and oxidation reactions can occur. [13][14][15][16] Fuel pyrolysis is the fragmentation of the larger fuel molecule into smaller molecules, such as alkenes, via endothermic reaction. When oxidized by available oxygen, the gas mixture can produce heat due to exothermic reactions.…”

Section: Introductionmentioning

confidence: 99%

Thermal and chemical effects of fuel direct injection on kinetically controlled combustion of alcohol and gasoline fuels

Tongroon

Zhao

2014

International Journal of Engine Research

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Direct fuel injection into hot residual gases is an effective means to promote and control the autoignition timings during controlled autoignition combustion of gasoline engines. In order to understand better the underlying physical and chemical processes involved, a systematic experimental study was carried out on a single-cylinder engine with optical access by means of thermodynamic analysis, high-speed chemiluminescence imaging, and in-cylinder sampling-based gas chromatography and mass spectroscopy measurements. The relative effects of enthalpy of evaporation and gas expansion from direct liquid fuel injection were quantified. Alcohol fuels (methanol and ethanol), gasoline, and primary reference fuels were investigated and clarified. Chemiluminescence imaging and heat release analysis demonstrated the presence of fuel reforming reactions during the recompression stroke. In-cylinder gas speciation measurement showed that the fuel pyrolysis was the dominant process. In addition, exothermic fuel reformation reactions of alcohol resulted in an increase in the gas temperature and produced many intermediate species during negative valve overlap period. As a result, the start of main heat release process of alcohol fuel occurred earlier in the subsequent compression stroke.

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“…Depending on the oxygen available in the trapped mixture during the recompression stroke, fuel pyrolysis and/or oxidation reactions can occur. [11][12][13][14] Fuel pyrolysis is the fragmentation of larger fuel molecules into smaller molecules, such as alkenes, via endothermic reactions. When oxidised by available oxygen, the gas mixture can produce heat owing to exothermic reactions.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the effect of direct injection of alcohol fuel on minor heat release reactions and controlled autoignition combustion

Tongroon

Zhao

2012

Proceedings of the Institution of Mechanical Engineers, Part D:

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In this study, systematic investigation was carried out on the effect of alcohol on heat release reactions during the negative-valve-overlap period in a single-cylinder direct-injection gasoline engine equipped with an air-assisted injector. The fuels used included gasoline, gasoline–ethanol blends, gasoline–methanol blends, and pure ethanol and methanol. To achieve controlled autoignition combustion, the negative-valve-overlap method was employed to trap hot exhaust gases into which fuel was injected directly. An air-assisted injector injected fuel together with a small amount of air immediately after the exhaust valves were closed. The in-cylinder pressure was recorded and then the heat release was analysed. The occurrence of the heat release reactions were identified through the in-cylinder pressure and heat release analysis. In particular, the effect of the alcohol fuels on the degree of heat release reactions during the negative-valve-overlap period was investigated. In addition, its influence on the initiation and heat release of the main combustion process was analysed. Alcohol fuels were found to produce more heat release reactions during the negative-valve-overlap period. Methanol exhibited the most pronounced heat release. This resulted in advanced autoignition and faster combustion of alcohol–gasoline blended fuels, except for pure ethanol and methanol. Gasoline and low-alcohol fuel blends were characterised by hybrid combustion of initial slow flame propagation and faster autoignition combustion later on. The autoignition combustion became dominant as the percentage of alcohol increased.

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Analysis of Controlled Auto-Ignition/HCCI Combustion in a Direct Injection Gasoline Engine with Single and Split Fuel Injections

Cited by 15 publications

References 29 publications

Effects of applying EGR with split injection strategy on combustion performance and knock resistance in a spark assisted compression ignition (SACI) engine

Effects of applying EGR with split injection strategy on combustion performance and knock resistance in a spark assisted compression ignition (SACI) engine

Thermal and chemical effects of fuel direct injection on kinetically controlled combustion of alcohol and gasoline fuels

Analysis of the effect of direct injection of alcohol fuel on minor heat release reactions and controlled autoignition combustion

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