Analysis of ignition processes in fuel sprays using an ignition model considering heterogeneity in temperature and concentration of fuel-air mixtures； Colorado State University Clean Snowmobile Challenge 2002； Combu...Analysis of ignition processes in fuel sprays using an ignition model considering heterogeneity in temperature and concentration of fuel-air mixtures； Colorado State University Clean Snowmobile Challenge 2002； Combustion characteristics of a direct-injection, stratified- charge rotary engine using spark ignition and pilot flame ignition systems； Combustion control and mechanism with direct injection of reaction suppressors in a premixed charge compression ignition engine；Combustion control and operating range expansion with direct methanol injection in a premixed charge compression ignition engine；展开更多
This paper presents a recent advance in the study of injection of fuel containing dissolved gas (IFCDG).Using diesel fuel containing dissolved CO2, experiments were performed under atmospheric conditions on a diesel h...This paper presents a recent advance in the study of injection of fuel containing dissolved gas (IFCDG).Using diesel fuel containing dissolved CO2, experiments were performed under atmospheric conditions on a diesel hole-type nozzle and simple nozzles. The effects of gas concentration in the fuel, injection pressure and the nozzle L/D ratio were examined. In order to reveal the controlling mechanism of IFCDG, the orifice flow pattern, pressure characteristics and their effects were also investigated. The result shows that IFCDG can produce a parabolic-shaped spray pattern with good atomization, which suggests the ekistence of a new atomisation mechanism. In terms of atomization, the beneficial effect of the IFCDG is obtained at the dissolved gas concentration above the transition and in the region of larger nozzle L/D ratio. However, under unfavorable conditions, IFCDG will lead to deterioration of atomization with coarse fuel droplets. It is found that the big difference of the oracle pressure characteristics caused by the variation of the nozzle L/D ratio has a dominant influence on the separation of the dissolved gas from the fuel inside the orifice and is verified to account for a dramatic change in the spray pattern and determine the effect of IFCDG. It is considered that the concept of IFCDG could be attractive in producing more efficient, clean engine and find use in a wide range of application.展开更多
文摘Analysis of ignition processes in fuel sprays using an ignition model considering heterogeneity in temperature and concentration of fuel-air mixtures； Colorado State University Clean Snowmobile Challenge 2002； Combustion characteristics of a direct-injection, stratified- charge rotary engine using spark ignition and pilot flame ignition systems； Combustion control and mechanism with direct injection of reaction suppressors in a premixed charge compression ignition engine；Combustion control and operating range expansion with direct methanol injection in a premixed charge compression ignition engine；
文摘This paper presents a recent advance in the study of injection of fuel containing dissolved gas (IFCDG).Using diesel fuel containing dissolved CO2, experiments were performed under atmospheric conditions on a diesel hole-type nozzle and simple nozzles. The effects of gas concentration in the fuel, injection pressure and the nozzle L/D ratio were examined. In order to reveal the controlling mechanism of IFCDG, the orifice flow pattern, pressure characteristics and their effects were also investigated. The result shows that IFCDG can produce a parabolic-shaped spray pattern with good atomization, which suggests the ekistence of a new atomisation mechanism. In terms of atomization, the beneficial effect of the IFCDG is obtained at the dissolved gas concentration above the transition and in the region of larger nozzle L/D ratio. However, under unfavorable conditions, IFCDG will lead to deterioration of atomization with coarse fuel droplets. It is found that the big difference of the oracle pressure characteristics caused by the variation of the nozzle L/D ratio has a dominant influence on the separation of the dissolved gas from the fuel inside the orifice and is verified to account for a dramatic change in the spray pattern and determine the effect of IFCDG. It is considered that the concept of IFCDG could be attractive in producing more efficient, clean engine and find use in a wide range of application.
