EFFECT OF LOAD ON COMBUSTION CYCLIC VARIATION IN CNG/DIESEL DUAL-FUEL ENGINE
Dong Tang, Ning Liu, Jiawei Wang, Cen Zhao, Fuqiang Luo
Abstract
In this paper, analysis on combustion cyclic variation of different loads in compressed natural gas (CNG)/diesel dual-fuel engine was carried out. It is found that under high-speed conditions, when the load increased from 25% to 100%, the indicated mean effective pressure (IMEP) decreased by 19.5%, and the cyclic variation coefficient of IMEP increased by 298.4%. The maximum cylinder pressure (Pmax) and its cyclic variation both increased with load, and the coefficient of cyclic variation of Pmax is large at low speeds. The rise rate of maximum pressure and its cyclic variations both increased and then decreased, and the rise rate of maximum pressure reaches the maximum at 75% load.
Topics & Concepts
Diesel engineCombustionDiesel fuelMean effective pressureMaterials scienceAutomotive engineeringCorrelation coefficientCoefficient of variationEnvironmental scienceCompression ratioChemistryMathematicsStatisticsChromatographyOrganic chemistryEngineeringAdvanced Combustion Engine TechnologiesVehicle emissions and performanceEngineering Applied Research