Fuel temperature influence on the performance of a last generation common-rail diesel ballistic injector. Part I: Experimental mass flow rate measurements and discussion

Abstract

ElsevierSalvador Rubio, FJ.; Gimeno, J.; Carreres Talens, M.; Crialesi Esposito, M. (2016). Fuel temperature influence on the performance of a last generation common-rail diesel ballistic injector. Part I: Experimental mass flow rate measurements and discussion. Energy Conversion and Management. 114:364-375. doi:10.1016/j.enconman.2016.02.042.Salvador, F.J., Gimeno, J., Carreres, M., Crialesi-Esposito, M., "Fuel temperature influence on the performance of a last generation common-rail diesel ballistic injector. Part I: Experimental mass flow rate measurements and discussion". 31Results show an important influence of the fuel temperature, especially at low injection pressure. A 32 low injection temperature results in a lower stationary mass flow rate, whereas injection duration is 33 also reduced. These results will be explained mainly through the fuel properties variation induced 34 by temperature, together with the ballistic nature of the injector used for the study.

Investigation of the effect of heated ethanol fuel on combustion and emissions of an ethanol direct injection plus gasoline port injection (EDI + GPI) engine

“…Experiments and simulations on the fuel injection process showed that, when the fuel temperature was increased, the actual injection timing was retarded, the peak rail pressure was decreased and the injection duration was prolonged [32,35]. The fuel mass flow rate was decreased with the increase of fuel temperature because of the decreased fuel density [24,36,37]. Furthermore, the size of vapour bubbles at the injector's nozzle exit increased with the increase of the fuel temperature [38], which would decrease the nozzle discharge coefficient.…”

Model Issues Regarding Modification of Fuel Injector Components to Improve the Injection Parameters of a Modern Compression Ignition Engine Powered by Biofuel

“…It is affected by the physical fuel properties, such as the density, kinematic viscosity, and volumetric coefficient of elasticity of the fuel. If the mentioned parameters increase, then the attenuation of fuel in the injector decreases, and it causes faster needle rising in the atomizer, which extends the injection advance angle Salvador et al [11]. This results in increased pressure in the combustion chamber and a higher emission of nitrogen oxides.…”

“…The injection dose factor is then dependent on the Reynolds number. However, when the pressure in the system begins to increase, the flow passes into the turbulent phase, then the injection dose factor is independent of the Reynolds number Salvador et al [14]. In work Desantes et al [15], the process of injection of methyl esters of rapeseed oil mixed with diesel oil was compared in the proportions-5% bio-additive (B5), 30% bio-additive (B30) and pure methyl ester (B100).…”

Transient states analysis of CI engine injectors with the use of optical methods

“…Some prototypes of direct acting piezoelectric injector were presented by Delphi [6] and Continental [7]. The study on these designs was focused on the influence of voltage on fuel flow rate [3,8,9]. Payri et al [9] in their studies used a prototype injector with different rate-shaping models to evaluate the compression ignition indexes of diesel fuel.…”

“…The said authors used optical methods only to evaluate the rate of fuel spray development during injection but they did not use these methods to estimate the hydraulic delay of fuel injection. Salvador et al [3] determined injection delay as a difference between the start of injector energizing and start of fuel spray outflow from injector, which was measured in diagnostic system for estimation of fuel flow rate. This research was conducted for injection pressure range 30-180 MPa and for different fuel temperatures.…”