Abstract
The double-layer diverging combustion chamber (DLDC chamber) aims to improve the fuel–air mixing formation and promote in-cylinder air utilization by changing fuel spray spreading characteristics. In order to investigate how the DLDC chamber profile and injection parameters affect the fuel spray spreading, visualization of fuel injection and impingement tests were carried out on two different DLDC chambers with different fuel injection parameters. The visualization test results showed that double-layer fuel spray spreading was obtained in the two DLDC chambers and the peripheral top clearance of each chamber was utilized efficiently. The DLDC chamber with a 50% upper layer volume provided a larger fuel spray distribution region after the start of injection. The DLDC chamber with a 70% upper layer volume obtained a larger fuel spray distribution region with better top clearance utilization at the later stage of injection. The injection parameters mentioned in this research showed significant effects on the fuel spray spreading in the DLDC chamber. Increasing the injection pressure provided a larger fuel spray distribution area at the beginning of injection. Decreasing the nozzle hole diameter had a positive influence on obtaining a larger fuel spray distribution. Advancing the injection timing enabled the enlarging of the fuel distribution region.
Highlights
Since the fossil energy shortages and air pollution have become increasingly serious in recent years, a series of brake-specific fuel consumption (BSFC) standards and strict emission control regulations have been released for diesel engines [1,2,3]
Montajir et al [6,7] researched the effects of diesel chamber geometry and the in-cylinder reverse squish on the fuel spray behavior in an optical engine with a square chamber by the shadowgraph method
Two different DLDC chambers were employed in this visualization test
Summary
Since the fossil energy shortages and air pollution have become increasingly serious in recent years, a series of brake-specific fuel consumption (BSFC) standards and strict emission control regulations have been released for diesel engines [1,2,3]. Su et al [4] investigated how chamber wall and injection parameters affected spray in a constant volume bomb by the shadowgraph method. This research points out that the fuel jet is divided into the main jet region and wall jet region after the fuel is impinged to a flat wall. Montajir et al [6,7] researched the effects of diesel chamber geometry and the in-cylinder reverse squish on the fuel spray behavior in an optical engine with a square chamber by the shadowgraph method. The results show that a larger injection angle provides longer
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