scholarly journals Effect of Injection Conditions on Penetration and Drop Size of HCCI Diesel Sprays

2004 ◽  
pp. 367-381
Author(s):  
L. Araneo ◽  
A. Coghe
Keyword(s):  
Drop Size ◽  
Diesel Sprays

Spray Size Evolution of Diesel Sprays

2006 ◽  
Author(s):  
Badih A. Jawad ◽  
Chris Riedel
Keyword(s):  
Drop Size ◽  
Single Injection ◽  
Temporal Analysis ◽  
Diesel Sprays ◽  
Efficient Operation ◽  
Transmitted Beam ◽  
Cyclic Operation ◽  
Size Evolution ◽  
Trace Measurement ◽  
Beam Monitoring

Variations of fuel spray characteristics during cyclic operation is directly correlated to efficient operation of an engine. Measurements of drop size distribution and drop concentration under transient conditions during injection are difficult. A very rapid and synchronized measurement technique is necessary for sectional and temporal analysis of an intermittent spray during approximately 50 ms after each injection. A pulsed-spray sizer based on Fraunhofer diffraction pattern analysis was modified so that the repeatability of each injection can be determined by an obscuration-trace measurement. The sizer with a built-in adjustable delay was synchronized to the needle-lift of the injector and the drop size data were captured over 20 microseconds. For every single injection, the attenuation of the transmitted beam monitoring the arrival, the duration, and the drop concentration in the spray was recorded and stored on a digital scope. A solenoid controlled the position of the rack on the fuel line and ensured single injection. The obscuration-trace was used as a “fingerprint” in testing the reproducibility of successive injections. Drop size measurements were statistically averaged over many reproducible cycles.

Reduction of Numerical Parameter Dependencies in Diesel Spray Models

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
Neerav Abani ◽  
Achuth Munnannur ◽  
Rolf D. Reitz
Keyword(s):  
Relative Velocity ◽  
Drop Size ◽  
Size Variation ◽  
Gas Jet ◽  
Time Step ◽  
Diesel Sprays ◽  
Radius Of Influence ◽  
Numerical Grid ◽  
Jet Theory ◽  
Model Diesel

Numerical grid and time-step dependencies of discrete droplet Lagrangian spray models are identified. The two main sources of grid dependency are due to errors in predicting the droplet-gas relative velocity and errors in describing droplet-droplet collision and coalescence processes. For reducing grid dependency due to the relative velocity effects, a gas-jet theory is proposed and applied to model diesel sprays. For the time-step dependency, it is identified that the collision submodel results in drop size variation in the standard spray model. A proposed spray model based on the gas-jet theory is found to improve the time-step independency also along with the mesh independency. The use of both Eulerian (collision mesh) and Lagrangian (radius of influence) collision models along with the gas-jet theory is found to provide mesh-independent results.

Reduction of Numerical Parameter Dependencies in Diesel Spray Models

2007 ◽  
Author(s):  
Neerav Abani ◽  
Achuth Munnannur ◽  
Rolf D. Reitz
Keyword(s):  
Relative Velocity ◽  
Drop Size ◽  
Size Variation ◽  
Gas Jet ◽  
Time Step ◽  
Diesel Sprays ◽  
Radius Of Influence ◽  
Numerical Grid ◽  
Jet Theory ◽  
Model Diesel

Numerical grid and time-step-dependencies of Discrete Droplet Lagrangian spray models are identified. The two main sources of grid-dependency are due to errors in predicting the droplet-gas relative velocity, and errors in describing droplet-droplet collision and coalescence processes. For reducing grid-dependency due to the relative velocity effects, gas jet theory is proposed and applied to model diesel sprays. For the time-step dependency, it is identified that the collision sub-model results in drop size variation in the standard spray model. A proposed spray model based on the gas-jet theory is found to improve the time-step independency also along with the mesh independency. The use of both Eulerian (collision mesh) and Lagrangian (radius of influence) collision models along with gas-jet theory is found to provide mesh-independent results.

COMPARISON OF DROP SIZE DATA FROM GROUND AND AERIAL APPLICATION NOZZLES AT THREE TESTING LABORATORIES

2014 ◽  
Vol 24 (2) ◽  
pp. 181-192 ◽  
Author(s):  
Bradley K. Fritz ◽  
W. Clint Hoffmann ◽  
Greg R. Kruger ◽  
Ryan S. Henry ◽  
Andrew Hewitt ◽  
...  
Keyword(s):  
Drop Size ◽  
Aerial Application ◽  
Testing Laboratories ◽  
Size Data

STUDY OF AMBIENT TURBULENCE EFFECTS ON DIESEL SPRAYS IN A FAN-STIRRED VESSEL

2006 ◽  
Vol 16 (6) ◽  
pp. 687-704 ◽  
Author(s):  
Tamas Jakubik ◽  
Malcolm Lawes ◽  
Robert Woolley ◽  
Miroslav Jicha
Keyword(s):  
Diesel Sprays ◽  
Stirred Vessel ◽  
Turbulence Effects ◽  
Ambient Turbulence

CHARACTERIZATION OF EVAPORATING DIESEL SPRAYS USING EXCIPLEX LASER-INDUCED FLUORESCENCE MEASUREMENTS

2003 ◽  
Vol 13 (5-6) ◽  
pp. 535-560 ◽  
Author(s):  
T. Kim ◽  
J. B. Ghandhi
Keyword(s):  
Laser Induced Fluorescence ◽  
Diesel Sprays ◽  
Fluorescence Measurements

DROP SIZE MEASUREMENTS IN HEAVY OIL SPRAYS FROM PRESSURE-SWIRL NOZZLES

1996 ◽  
Vol 6 (4) ◽  
pp. 377-408 ◽  
Author(s):  
Cesar Dopazo ◽  
Javier Ballester
Keyword(s):  
Heavy Oil ◽  
Drop Size ◽  
Pressure Swirl

PREDICTING DROP SIZE DISTRIBUTIONS FROM FIRST PRINCIPLES FOR NON-NEWTONIAN FLUIDS

2001 ◽  
Vol 11 (6) ◽  
pp. 22 ◽  
Author(s):  
E. Babinsky ◽  
Paul E. Sojka
Keyword(s):  
First Principles ◽  
Drop Size ◽  
Newtonian Fluids ◽  
Size Distributions ◽  
Drop Size Distributions
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