Diesel nozzle geometry influence on spray liquid-phase fuel penetration in evaporative conditions

Needle lift profile influence on the vapor phase penetration for a prototype diesel direct acting piezoelectric injector

“…As expected, an increase in injection pressure produces an increase in vapor penetration rates. These results agree with those previously obtained for the momentum flux and mass flow rates of this same injector by the authors in [8] [9] and the relation between mass flow rate, momentum flux and outlet velocity [25] [26].…”

A computational investigation on the influence of the use of elliptical orifices on the inner nozzle flow and cavitation development in diesel injector nozzles

“…Indeed, the most important and influencing parameters in the mixture formation are the effective velocity of injection and the spray spreading angle ( [13][28]). The higher both parameters are, the lower the mixing characteristic time and the mixing characteristic length ( [13]), thus improving the mixture and combustion process.…”

“…The comparison has been made in terms of mass flow, momentum flux and other important non-dimensional parameters which are important features describing the behaviour of the inner nozzle flow: discharge coefficient (C d ), area coefficient (C a ) and velocity coefficient (C v ). Furthermore, the fact that nonconvergent holes are used makes the nozzles prone to cavitate ( [13]). Thus, critical conditions for cavitation inception, its development and morphology have also been studied and analysed.…”

An Experimental Study of Emission and Combustion Characteristics of Marine Diesel Engine in Case of Cylinder Valves Leakage

“…Weiser, in his doctor's thesis [11] , presents results of direct measurements on 9-cylinder, medium-speed engine. Works about comparing the emission characteristics of diesel engines with direct and indirect fuel injection [12], different types of fuels [12], injection strategies [13] - [16], and nozzle geometries [17] , are also available. The experimental investigations of diesel combustion with water emulsion [18], [19] and different fuel bio-components [20] - [30] and much frequently are presented.…”