Spray Formation of High Pressure Swirl Gasoline Injectors Investigated by Two-Dimensional Mie and LIEF Techniques

Ipp, Wolfgang; Wagner, Volker; Krämer, H.; Wensing, Michael; Leipertz, Alfred; Arndt, Stefan; Jain, A. K.

doi:10.4271/1999-01-0498

Cited by 40 publications

(11 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previously published investigations [1][2][3][4][5][6][7][8] have mainly focused on swirl pressure atomisers, known as first-generation injectors. In general, this type of injector can produce very finely atomised droplets with diameters (SMD) in the range 15-25μm over a moderate range of injection pressures (50-100bar).…”

Section: Introductionmentioning

confidence: 99%

Spray Characteristics of a Multi-hole Injector for Direct-Injection Gasoline Engines

Mitroglou

Nouri

Gavaises

et al. 2006

International Journal of Engine Research

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Spray Characteristics of a Multi-hole Injector for Direct-Injection Gasoline Engines

Mitroglou

Nouri

Gavaises

et al. 2006

International Journal of Engine Research

View full text Add to dashboard Cite

show abstract

“…Although, all the images share the same time-base, the difference in spray development is quite evident. According to the captured images, the spray structure for injection duration of 0.9 and 1.5ms are identical, but different to that at 0.75ms especially towards the end of injection; similar behaviour was also observed with a swirl atomiser [6]. More specifically, at 0.26ms ASOI in the case of the 0.75ms injection duration the spray starts fading out and finally disappears.…”

Section: Spray Visualisationmentioning

confidence: 61%

“…Numerous investigations such as those in [4][5][6][7][8][9][10][11] have demonstrated that swirl injectors provide good performance particularly for high load homogeneous mixture operation and produce fine droplets with SMD in the range 15-25μm. However, the major disadvantage of swirl pressure atomisers is the observed instability of the spray cone structure with chamber pressure, which leads to complete collapse of the spray structure when injected during the compression stroke.…”

Section: Introductionmentioning

confidence: 99%

Spray Structure From Double Fuel Injection in Multihole Injectors for Gasoline Direct-Injection Engines

2009

View full text Add to dashboard Cite

Citation: Mitroglou, N., Nouri, J. M. & Arcoumanis, C. (2009). Spray structure from double fuel injection in multihole injectors for gasoline direct-injection engines. Atomization and Sprays, 19(6), pp. 529-545. doi: 10.1615/AtomizSpr.v19.i6.30 This is the unspecified version of the paper.This version of the publication may differ from the final published version. Permanent ABSTRACTThe spray characteristics of double fuel injection in multi-hole injectors for direct-injection gasoline engines have been evaluated in a constant-volume chamber using Iso-Octane as fuel. Measurements of droplets mean and rms velocity and their diameter were obtained using a 2-D phase Doppler anemometer (PDA) at injection pressures up to 120bar, atmospheric chamber pressures and ambient temperatures up to 115°C. Complementary spray visualisation made use of a pulsed light, a CCD camera and a high-speed video camera synchronised with the injection process. Spray images with double injection revealed that there are delay times in needle opening and closing of the order of 0.6ms and 0.3ms, respectively, and that dwell times less than 0.5ms introduced a pre-spray prior to the second injection event while, for dwell times more than 0.5ms, the images showed that the overall jet-spray structure in the cases of the first and second injection event remained the same as those of single injection.PDA results near the injector exit quantified the relatively strong pre-spray at 0.3ms dwell time and revealed that its strength reduced with increasing dwell time so that at 1ms there was no sign of the prespray. The effect of ambient chamber temperature on the spray velocity for double injection was found to be significant at temperatures above 90°C; results at higher temperatures, 115°C, showed a consistent reduction in the mean droplets velocity up to 10% within the core of the first and second sprays, with a corresponding increase in the RMS velocity fluctuations due to the increased vaporisation rates and the droplets momentum loss. The droplet size distribution of the double injection spray was, in general, similar to that of single injection except during the dwell time when the droplets arithmetic mean diameter (AMD) with pre-spray was found to be smaller than those without the pre-spray because of the different type of droplets and the much higher data rates in the case of the pre-spray.

show abstract

“…In order to overcome this problem and also to allow liquid and vapour phases to be displayed separately the laser induced Exciplex fluorescence (LIEF) method was developed [4][5][6][7][8][9][10]. With this technique two dopants with very similar emission wavelengths are added to the fuel.…”

Section: The Traditional Laser Induced Fluorescence (Lif)mentioning

confidence: 99%

Two-phase Fuel Distribution in an Air Assisted DI Gasoline Engine(S.I. Engines, Combustion Diagnostics)

Leach¹,

Zhao²,

Li³

et al. 2004

COMODIA

View full text Add to dashboard Cite

During the injection and mixture formation processes of a DI gasoline engine fuel may exist in either the liquid or vapour phase and it is therefore advantageous to be able to observe both phases simultaneously. However, traditional LIF techniques are not suitable for this purpose since the large differences in fluorescence intensity from the two phases make the selection of a suitable light collection level virtually impossible. In an attempt to overcome this problem the Laser Induced Exiplex Fluorescence (LIEF) technique was applied to a single cylinder DI gasoline engine. The engine was equipped with an air assisted fuel injection system and it had full optical access through a quatz liner and transparent piston crown. Isooctane was used as the test fuel with dopants Naphthalene (7%) and N,N-dimethlylaniline (DMA) (7%). The expanded laser beam from a XeCl Excimer laser was used to illuminate the whole combustion chamber and act as the excitation source for the LIEF system. In order to collect simultaneously fluorescence signals from both liquid and vapour phases emissions an image doubling and filtering system was designed and constructed. The fluorescence images were recorded from the front of the cylinder, perpendicular to the axis of the crankshaft. In order to investigate the effect of absorption on the fluorescence signal the beam was introduced to the cylinder from 3 directions. Initially the beam entered from the left of the image. The experiment was then repeated with the beam entering from the right and finally entering from below through the transparent piston crown. The crank angle resolved results, from the start of injection to the end of the compression stroke are presented with an image for each illumination direction.

show abstract

Spray Formation of High Pressure Swirl Gasoline Injectors Investigated by Two-Dimensional Mie and LIEF Techniques

Cited by 40 publications

References 19 publications

Spray Characteristics of a Multi-hole Injector for Direct-Injection Gasoline Engines

Spray Characteristics of a Multi-hole Injector for Direct-Injection Gasoline Engines

Spray Structure From Double Fuel Injection in Multihole Injectors for Gasoline Direct-Injection Engines

Two-phase Fuel Distribution in an Air Assisted DI Gasoline Engine(S.I. Engines, Combustion Diagnostics)

Contact Info

Product

Resources

About