Research on cycle-by-cycle variations of an SI engine with hydrogen direct injection under lean burn conditions

Yu, Xiumin; Wu, Hailin; Du, Yaodong; Tang, Yang; Liu, Lin; Niu, Renxu

doi:10.1016/j.applthermaleng.2016.08.077

Cited by 77 publications

(26 citation statements)

References 41 publications

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“…Exhaust port closure temperature (T epc ) should be sufficiently high to achieve a complete combustion at the end of the compression stroke via spark plus ignition. The usage of EGR will result in a higher gas temperature regime throughout the compression process, which in turn speeds up the chemical reactions which will lead to the start of combustion of homogeneously mixed fuel and air mixtures [31][32][33][34][35]. These requirements can be realized by recycling or trapping the burned gases within the cylinder, which the former is called External EGR (Ex-EGR) and the latter is called Internal EGR (In-EGR), respectively.…”

Section: Influence Of Egr Applicationmentioning

confidence: 99%

Combustion and Emission Enhancement of a Spark Ignition Two-Stroke Cycle Engine Utilizing Internal and External Exhaust Gas Recirculation Approach at Low-Load Operation

et al. 2019

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Two-stroke cycle engines have always been prominent due to their distinctive advantage incorporating high power-to-weight ratio, however the drawbacks are poor combustion efficiency, fuel short-circuiting and excessive emission of uHC and CO. These problems are apparent at low-load and speed regions and are the major obstacle to their global acceptance. The deficiencies can be addressed by increasing the in-cylinder average charge temperature employing Exhaust Gas Recirculation (EGR). An experimental study is conducted to investigate the influence of utilizing EGR techniques, including Internal and External EGR, on combustion misfiring occurrence, combustion stability and exhaust emissions using a single cylinder two-stroke SI engine at idling, low and mid-load conditions. From the results, it is observed since the average in-cylinder charge temperature is increased, due to utilizing EGRs, engine’s low and mid-load irregular combustions (misfire) and exhaust emissions are remarkably supressed and almost all of misfire cycles eliminated depending on the percentage of EGRs. In terms of combustion stability, it is agreed in general the application of EGRs improves the cyclic variation of IMEP, Pmax and CA10 compared to conventional operation. However, applying Ex-EGR compared to In-EGR will deteriorate cyclic variability of IMEP and CA10.

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Section: Influence Of Egr Applicationmentioning

confidence: 99%

Combustion and Emission Enhancement of a Spark Ignition Two-Stroke Cycle Engine Utilizing Internal and External Exhaust Gas Recirculation Approach at Low-Load Operation

et al. 2019

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“…This process occurs due to several factors including the variation of cylinder mixture motion, variation in the amount of air-fuel injected, fuel properties, combustion temperature and burn angle [23,[27][28][29]. Ultimately, cyclic variation will affect performance and efficiency of engines, which will consequently reduce the output power, increase fuel consumption and exhaust emission, increase noise and decrease engine durability [30][31][32]. Research related to cyclic variation has produced mixed results.…”

Section: Introductionmentioning

confidence: 99%

Cyclic Variation Analysis of Palm Biodiesel Fuel in Low Compression Marine Diesel Engine

Noor¹,

Mamat²,

Ali³

et al. 2020

ARFMTS

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Environmental pollution due to fossil fuel combustion has made biodiesel a viable option. Biodiesel fuel has been widely used in land-based vehicle engines, but it is limited to marine sectors. This study investigated the cyclic variations effect of palm biodiesel to determine combustion stability in low compression marine diesel engine. The time series of peak pressure and indicated mean effective pressure is examined using statistical and continuous wavelet transformation methods. The results show that the cyclic variations on marine engine operated with palm biodiesel are better than diesel, as indicated by lower COVpmax and COVIMEP values, which are below 1.29% and 2.50% respectively. Increase the percentage of palm biodiesel in blends has gradually reduced the COVIMEP and the B30 palm biodiesel blend produces the minimum cyclic variations of IMEP with 1.91%. This finding was agreed with the wavelet spectrum results which revealed that the B30 palm biodiesel blend has the lowest IMEP frequency oscillation. The B30 palm biodiesel blend has produced the most stable combustion among the tested fuels.

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“…Hydrogen has a high-octane number and burn velocity, promoting a more stable combustion and reducing knock tendency [21]. These characteristics make the use of hydrogen attractive especially for applications on SI engines working under lean burn conditions as they allow the extension of the lean limit [22].…”

Section: Introductionmentioning

confidence: 99%

“…Of course, certain benefits can be also achieved in terms of reduced CCV and improved combustion stability through the optimal control of cylinder operation, acting on the mitigation or the substantial elimination of the cylinder unbalance in a multi-cylinder SI engine [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Individual Cylinder Combustion Optimization to Improve Performance and Fuel Consumption of a Small Turbocharged SI Engine

Marchitto¹,

Tornatore²,

Teodosio³

2020

Energies

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Stringent exhaust emission and fuel consumption regulations impose the need for new solutions for further development of internal combustion engines. With this in mind, a refined control of the combustion process in each cylinder can represent a useful and affordable way to limit cycle-to-cycle and cylinder-to-cylinder variation reducing CO2 emission. In this paper, a twin-cylinder turbocharged Port Fuel Injection–Spark Ignition engine is experimentally and numerically characterized under different operating conditions in order to investigate the influence of cycle-to-cycle variation and cylinder-to-cylinder variability on the combustion and performance. Significant differences in the combustion behavior between cylinders were found, mainly due to a non-uniform effective in-cylinder air/fuel (A/F) ratio. For each cylinder, the coefficients of variation (CoVs) of selected combustion parameters are used to quantify the cyclic dispersion. Experimental-derived CoV correlations representative of the engine behavior are developed, validated against the measurements in various speed/load points and then coupled to an advanced 1D model of the whole engine. The latter is employed to reproduce the experimental findings, taking into account the effects of cycle-to-cycle variation. Once validated, the whole model is applied to optimize single cylinder operation, mainly acting on the spark timing and fuel injection, with the aim to reduce the specific fuel consumption and cyclic dispersion.

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Research on cycle-by-cycle variations of an SI engine with hydrogen direct injection under lean burn conditions

Cited by 77 publications

References 41 publications

Combustion and Emission Enhancement of a Spark Ignition Two-Stroke Cycle Engine Utilizing Internal and External Exhaust Gas Recirculation Approach at Low-Load Operation

Combustion and Emission Enhancement of a Spark Ignition Two-Stroke Cycle Engine Utilizing Internal and External Exhaust Gas Recirculation Approach at Low-Load Operation

Cyclic Variation Analysis of Palm Biodiesel Fuel in Low Compression Marine Diesel Engine

Individual Cylinder Combustion Optimization to Improve Performance and Fuel Consumption of a Small Turbocharged SI Engine

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