The paper presents the results of an extensive experimental activity aimed at exploring the potentialities of improvement of an ICE operation, working in dual fuel modality, through the gaseous charge stratification. In this early experimental campaign, the engine under analysis, a single cylinder equipped with a common rail Diesel fuel injection system, has been fed with two gaseous fuels, hydrogen and methane, through an injector positioned along the intake duct, thanks to the facilities available in Machinery Laboratory at University of Salento, with which it is possible to mix up to five gaseous species (CO2, CO, H2, N2, CH4) freely setting the mixture composition and pressure. The gaseous mixture air-fuel has been introduced into the combustion chamber inducing a swirl bulk motion; once trapped into the cylinder, the gaseous mixture has been ignited injecting a small quantity of Diesel fuel, while the injector used for supplying the gaseous fuel has been positioned either upstream the intake duct, in order to obtain a more homogeneous gaseous mixture before it enters the cylinder, or just before the intake valve, so trying to obtain a stratified-like distribution of the fuel into the cylinder before the combustion start. During the tests, the value of several factors affecting the process of charge preparation have been varied: injection pressure of the gaseous fuel, quantity of Diesel fuel, in addition to the variation of the gas injector position. The effect of these factors has been evaluated on the behavior of the pressure in the combustion chamber, on the related heat release rate and on the pollutant emission levels at the exhaust.
EFFECT OF THE CHARGE PREPARATION IN A COMPRESSION IGNITION DUAL FUEL ENGINE – COMPARISON BETWEEN METHANE AND HYDROGEN
CARLUCCI, Antonio Paolo;FICARELLA, Antonio;LAFORGIA, Domenico;STRAFELLA, Luciano
2012-01-01
Abstract
The paper presents the results of an extensive experimental activity aimed at exploring the potentialities of improvement of an ICE operation, working in dual fuel modality, through the gaseous charge stratification. In this early experimental campaign, the engine under analysis, a single cylinder equipped with a common rail Diesel fuel injection system, has been fed with two gaseous fuels, hydrogen and methane, through an injector positioned along the intake duct, thanks to the facilities available in Machinery Laboratory at University of Salento, with which it is possible to mix up to five gaseous species (CO2, CO, H2, N2, CH4) freely setting the mixture composition and pressure. The gaseous mixture air-fuel has been introduced into the combustion chamber inducing a swirl bulk motion; once trapped into the cylinder, the gaseous mixture has been ignited injecting a small quantity of Diesel fuel, while the injector used for supplying the gaseous fuel has been positioned either upstream the intake duct, in order to obtain a more homogeneous gaseous mixture before it enters the cylinder, or just before the intake valve, so trying to obtain a stratified-like distribution of the fuel into the cylinder before the combustion start. During the tests, the value of several factors affecting the process of charge preparation have been varied: injection pressure of the gaseous fuel, quantity of Diesel fuel, in addition to the variation of the gas injector position. The effect of these factors has been evaluated on the behavior of the pressure in the combustion chamber, on the related heat release rate and on the pollutant emission levels at the exhaust.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
