Search results for "Engine knocking"

showing 3 items of 3 documents

Octane Rating of Natural Gas-Gasoline Mixtures on CFR Engine

2014

In the last years new and stricter pollutant emission regulations together with raised cost of conventional fuels resulted in an increased use of gaseous fuels, such as Natural Gas (NG) or Liquefied Petroleum Gas (LPG), for passenger vehicles. Bi-fuel engines represent a transition phase product, allowing to run either with gasoline or with gas, and for this reason are equipped with two separate injection systems. When operating at high loads with gasoline, however, these engines require rich mixtures and retarded combustions in order to prevent from dangerous knocking phenomena: this causes high hydrocarbon (HC) and carbon monoxide (CO) emissions together with high fuel consumption. With t…

EngineeringWaste managementbusiness.industryStrategy and ManagementMechanical EngineeringHomogeneous charge compression ignitionMetals and AlloysLiquefied petroleum gasoctane rating CFR engine knock spark ignition engineIndustrial and Manufacturing EngineeringSettore ING-IND/08 - Macchine A FluidoInternal combustion engineNatural gasEngine efficiencyOctane ratingEngine knockingGasolinebusinessSAE International Journal of Fuels and Lubricants
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Calibration of a knock prediction model for the combustion of gasoline-LPG mixtures in spark ignition engines

2015

Gaseous fuels, such as liquefied petroleum gas (LPG) and natural gas (NG), thanks to their good mixing capabilities, allow complete and cleaner combustion than gasoline in spark ignition (SI) engines, resulting in lower pollutant emissions and particulate matter. In a previous work the authors showed that the simultaneous combustion of gasoline and LPG improves an SI engine efficiency with respect to pure gasoline operation with any significant power loss. The addition of LPG to the gasoline-air mixture produces an increase in knock resistance that allows running the engine at full load with overall stoichiometric mixture and better spark advance. In order to predict both performance and ef…

business.industryGeneral Chemical EngineeringHomogeneous charge compression ignitionGeneral Physics and AstronomyEnergy Engineering and Power TechnologyGeneral ChemistryCombustionlaw.inventionIgnition systemmodellingFuel TechnologyKnockingSettore ING-IND/08 - Macchine A FluidoInternal combustion enginelawSpark-ignition engineSpark ignition engineEnvironmental scienceOctane ratingEngine knockingGasolineProcess engineeringbusinessLiquefied petroleum ga
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Preliminary Experimental Study on Double Fuel HCCI Combustion

2015

AbstractThis paper regards an experimental study on a particular internal combustion engine process which combines Double Fuel combustion with Homogeneous Charge Compression Ignition (HCCI) using mixtures of natural gas (NG) and gasoline. The tests performed on a CFR engine demonstrate that HCCI combustion can be achieved using NG-gasoline mixtures without knocking occurrence for low to medium engine load varying the proportion between the two fuels. The main advantage of this new combustion process relies on the noticeable higher engine efficiency obtained with respect to conventional spark ignition operation, and on the strong reduction of NOX emissions.

gasolinesimultaneous combustionChemistryHomogeneous charge compression ignitionNatural gaDiesel cycleCombustionNitric OxideAutomotive engineeringlaw.inventionIgnition systemnatural gasSettore ING-IND/08 - Macchine A FluidoInternal combustion engineEnergy(all)lawEngine efficiencyefficiencyCompression ratioHCCIDouble FuelEngine knockingEnergy Procedia
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